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San Bernardino County, California | The Largest County in the U.S.
San Bernardino County, California is the largest county in the United States by area. Offering an incredible range of landscapes and experiences. From the peaks of the San Bernardino Mountains to the vast Mojave Desert, the region blends natural beauty with growing urban centers.
Visitors can enjoy year-round recreation including hiking, skiing, boating. Off-roading, along with scenic drives and historic Route 66 landmarks. The county is also home to vibrant communities, cultural attractions, and family-friendly destinations.
Whether you’re seeking mountain retreats, desert adventures, or lakeside escapes. San Bernardino County delivers diverse travel experiences all within Southern California.
Cities in San Bernardino County
Geographic Scale and Scope
San Bernardino County covers approximately 20,105 square miles of diverse California landscape. This massive area exceeds the combined size of New Jersey, Connecticut, Delaware, and Rhode Island. The county borders Los Angeles to the west and touches Arizona and Nevada to the east.
Its borders stretch from Inyo County in the north down to Riverside County in the south. This immense scale creates incredible geographic diversity across the entire region. Driving across its width takes over four hours of continuous travel.
- Explore urban centers in the densely populated western valleys.
- Climb high mountain peaks for stunning views of the surrounding wilderness.
- Traverse vast desert basins that define the county’s rugged interior.
- Visit the Colorado River along the eastern waterfront border.
- Experience a larger landmass than four individual U.S. states combined.
- Cross multiple state lines as you travel toward the eastern boundary.
The Western Urban Core
The western portion of San Bernardino County contains its largest population centers. This area is part of the Greater Los Angeles metropolitan region. Cities here function as suburbs and employment centers within the vast Southern California urban fabric.
San Bernardino serves as the county seat and the region’s governmental and cultural hub. Nearby, Ontario operates as a major economic powerhouse with a massive airport and expansive warehouse districts. The cities of Rancho Cucamonga, Fontana, and Upland provide populous suburban neighborhoods and thriving retail centers.
This western region enjoys a Mediterranean climate with hot, dry summers and mild, rainy winters. The terrain consists of flat alluvial plains that rise dramatically toward the towering San Gabriel and San Bernardino Mountains.
- Visit San Bernardino to explore the county’s central government and cultural institutions.
- Fly through Ontario to access one of Southern California’s busiest economic and transit centers.
- Explore suburban Upland for charming residential streets and local employment bases.
- Hike the foothills where the flat plains meet the rugged mountain wilderness.
- Experience hot summers and mild winters in a classic Mediterranean environment.
- Shop at retail centers throughout the high-growth communities of Fontana and Rancho Cucamonga.
A Brief History
San Bernardino County’s human history spans thousands of years of diverse cultural evolution. Indigenous tribes like the Serrano, Cahuilla, Chemehuevi, and Mojave first mastered these varied landscapes. Spanish missionaries arrived in the late 18th century, followed by Mexican land grants and Mormon pioneers.
The state formally established the county in 1853 as one of California’s original jurisdictions. Silver discoveries and new railroads triggered rapid 19th-century growth. Today, the region serves as a global powerhouse for logistics, manufacturing, and international distribution.
- Honor the indigenous heritage of the Serrano, Cahuilla, Chemehuevi, and Mojave peoples.
- Trace the mission influence through early Spanish and Mexican colonial settlements.
- Explore the 1853 founding when the county covered an even larger territory.
- Follow the silver rush that brought thousands of miners to the region in the 1860s.
- Ride the historic railroads that connected the desert to the Pacific coast.
- Witness the post-war boom that transformed western cities into suburban hubs.
- Visit the logistics centers that now drive the modern Inland Empire economy.
Population and Demographics
San Bernardino County’s human history spans thousands of years of diverse cultural evolution. Indigenous tribes like the Serrano, Cahuilla, Chemehuevi, and Mojave first mastered these varied landscapes. Spanish missionaries arrived in the late 18th century, followed by Mexican land grants and Mormon pioneers.
The state formally established the county in 1853 as one of California’s original jurisdictions. Silver discoveries and new railroads triggered rapid 19th-century growth. Today, the region serves as a global powerhouse for logistics, manufacturing, and international distribution.
- Honor the indigenous heritage of the Serrano, Cahuilla, Chemehuevi, and Mojave peoples.
- Trace the mission influence through early Spanish and Mexican colonial settlements.
- Explore the 1853 founding when the county covered an even larger territory.
- Follow the silver rush that brought thousands of miners to the region in the 1860s.
- Ride the historic railroads that connected the desert to the Pacific coast.
- Witness the post-war boom that transformed western cities into suburban hubs.
- Visit the logistics centers that now drive the modern Inland Empire economy.
Economy and Employment
San Bernardino County maintains a diverse and evolving economy driven by several dominant sectors. Its strategic location makes it a national hub for logistics and distribution, with massive warehouses and Ontario International Airport handling global cargo. Healthcare serves as a major employer through a vast network of hospitals and public health clinics.
The retail and service sectors provide essential jobs for the growing population, while manufacturing continues to thrive in aerospace and electronics. Tourism significantly boosts the mountain and desert regions, and agriculture persists through livestock and crop production near the Colorado River.
- Support global trade by working in the county’s dominant logistics and warehousing industry.
- Access quality care at major medical centers like Loma Linda University Health and Arrowhead Regional.
- Fly through Ontario International to see one of the nation’s fastest-growing cargo and passenger hubs.
- Explore manufacturing careers in high-tech fields like aerospace, electronics, and specialty goods.
- Provide vital services by joining the county government, one of the region’s largest employers.
- Boost local tourism by visiting world-class ski resorts, hiking trails, and national parks.
- Grow local food through sustainable agriculture in the Victor Valley and along the Colorado River.
Transportation Infrastructure
San Bernardino County serves as a vital transportation crossroads for both the region and the nation. Its massive infrastructure network moves millions of people and tons of freight every day. Four major Interstates—the 10, 15, 215, and 40—connect Southern California to Nevada, Arizona, and the American Southwest.
Beyond the highways, the BNSF and Union Pacific railroads operate essential freight lines that link local warehouses to global ports. For air travel, Ontario International Airport acts as a primary gateway for both commercial passengers and massive cargo operations. This integrated system of roads, rails, and runways defines the county’s role as a global logistics leader.
- Drive the I-10 to travel between Los Angeles and the Arizona border.
- Take the I-15 north to reach Las Vegas or head south toward San Diego.
- Watch freight trains from BNSF and Union Pacific transport goods across the country.
- Fly from Ontario International for nonstop service to over 30 domestic and international cities.
- Commute on Metrolink to avoid freeway traffic when traveling to Los Angeles.
- Use Omnitrans or VVTA for reliable bus service across the urban and desert regions.
- Utilize the Alameda Corridor connection to move cargo efficiently from the ports to local hubs.
Government and Governance
San Bernardino County operates under a Board of Supervisors form of government. Five elected supervisors represent distinct geographic districts to set policy and oversee all county operations. The Board appoints a Chief Executive Officer, currently Luther Snoke, to manage daily administrative tasks. This government body provides essential services, including law enforcement through the Sheriff’s Department and fire protection via Cal Fire.
The county’s enormous size requires creative solutions to serve remote desert communities effectively. Leaders constantly balance the rapid urban growth of the west with the vital environmental preservation of the east.
- Meet your supervisor to discuss local policies affecting your specific geographic district.
- Access public records and library services through the county’s extensive community network.
- Stay safe with the Sheriff’s Department and local fire districts that provide 24/7 protection.
- Participate in public meetings held on Tuesdays at the County Government Center in San Bernardino.
- Follow the “Countywide Vision” to see how leaders plan for sustainable future growth.
- Utilize social services and public health programs designed to support residents in need.
Environmental Challenges
San Bernardino County faces significant environmental challenges magnified by its diverse and expansive geography. Wildfires pose a constant threat to mountain and foothill communities, fueled by dry brush and powerful Santa Ana winds. The entire region grapples with chronic drought, forcing a heavy reliance on groundwater and the Colorado River.
In western urban areas, the surrounding mountains trap vehicle and industrial emissions, leading to poor air quality. Meanwhile, the desert regions face sudden flash floods during intense storms as water rushes over hard-baked soils. As climate change progresses, residents must also adapt to more frequent and dangerous extreme heat events.
- Protect your home from wildfires by maintaining defensible space in mountain and foothill areas.
- Monitor the Santa Ana winds that can rapidly spread small sparks into massive urban-interface fires.
- Conserve local water to help manage the county’s limited supply from the State Water Project.
- Check daily air quality reports if you live in the western “Basin” where smog often settles.
- Avoid dry washes during desert rainstorms to stay safe from sudden, powerful flash floods.
- Seek cooling centers during summer heatwaves when desert temperatures frequently exceed 100°F.
- Plant native vegetation to reduce water waste and help stabilize soil against erosion.
A County of Contrasts
San Bernardino County thrives on its sharp and diverse contrasts. Wealthy mountain resorts sit just miles away from struggling desert outposts. Densely packed urban neighborhoods transition abruptly into miles of silent, empty wilderness. The pace of life shifts from the frantic rush of suburban commuters to the quiet rhythms of rural ranching.
These variations build a complex regional identity that few other places can match. Despite these differences, every resident shares the bond of living within this immense geographic giant.
- Experience the luxury of high-altitude mountain living in communities like Lake Arrowhead.
- Observe the isolation of remote desert towns where the wilderness dominates the landscape.
- Navigate the urban density of the western valleys during the busy morning rush.
- Feel the stillness of the Lucerne Valley where ranchers manage wide-open lands.
- Bridge the cultural gap between the bustling Ontario trade hubs and the quiet Colorado River.
- Discover a unified identity that brings these vastly different lifestyles under one county government.
America’s Largest County
San Bernardino County operates as a world unto itself. Its massive scale defies easy comprehension. The county contains mountains higher than any peaks in the eastern United States. Vast deserts stretch toward distant horizons while ancient rivers carve deep rock canyons. These borders house millions of people and offer endless economic opportunities.
Residents enjoy affordable living and unparalleled access to diverse nature. The county constantly grapples with rapid growth and complex environmental stressors. Serving such a vast and varied territory remains its greatest challenge and highest priority.
- Climb soaring peaks that reach higher than any mountain in the eastern U.S.
- Explore endless deserts where the horizon seems to go on forever.
- Hike through deep canyons carved by ancient rivers over millions of years.
- Build a life in vibrant cities that house millions of diverse residents.
- Pursue new jobs in a region defined by constant economic expansion.
- Access wild nature just a short drive from busy suburban neighborhoods.
- Witness the balance between urban development and environmental protection.
Cities in San Bernardino County
Adelanto
Adelanto is a rapidly growing city in the High Desert. It incorporated in 1970. The city is located in the Victor Valley region. Its name means “progress” or “advancement” in Spanish. Adelanto is known for its affordable housing and residential development. The city hosts a federal prison and a state prison. It is home to the Adelanto Stadium, formerly a minor league baseball venue. The population exceeds 38,000 residents.
Apple Valley
Apple Valley is an incorporated town in the High Desert. It became a town in 1988. The community was master-planned by developers Newton Bass and Bud Westlund. It is known for its rural residential character and horse properties. Apple Valley sits at the base of the San Bernardino Mountains. The town has a strong equestrian tradition. It is home to St. Mary Medical Center, a major regional hospital. The population exceeds 75,000 residents.
Barstow
Barstow is a historic city in the Mojave Desert. It incorporated in 1947. The city is a major transportation crossroads. Interstate 15 and Interstate 40 intersect here. Barstow has deep Route 66 heritage. It serves as a rest stop for travelers between Los Angeles and Las Vegas. The city is home to the Marine Corps Logistics Base Barstow. Fort Irwin military installation is nearby. Barstow has a strong railroad history with the BNSF and Union Pacific. The population is approximately 25,000 residents.
Big Bear Lake
Big Bear Lake is a mountain resort city. It incorporated in 1980. The city sits on the southern shore of its namesake lake. It is located in the San Bernardino Mountains at over 6,700 feet elevation. Big Bear Lake is a four-season recreation destination. Visitors enjoy skiing, snowboarding, boating, and hiking. The village offers shopping, dining, and entertainment. The population is approximately 5,000 residents, swelling dramatically with tourists.
Chino
Chino is a city in the southwestern portion of the county. It incorporated in 1910. The city is part of the Chino Valley. It historically was an agricultural center known for dairy farming. Chino has transformed into a residential and industrial suburb. It is home to the Chino Institute for Men and the California Institution for Women. The city hosts the Chino Airport and the Planes of Fame Air Museum. The population exceeds 90,000 residents.
Chino Hills
Chino Hills is an affluent planned city. It incorporated in 1991, making it one of the county’s newest cities. The city sits on rolling hills at the county’s southwestern edge. It is primarily residential with strict planning and open space preservation. Chino Hills is known for its highly rated schools and family-oriented character. The city features the Chino Hills State Park. The population exceeds 80,000 residents.
Colton
Colton is a city in the San Bernardino Valley. It incorporated in 1887. The city is named after railroad magnate David D. Colton. Colton has strong railroad heritage as a major switching yard. It is home to Arrowhead Regional Medical Center. The city hosts Colton Crossing, a famous rail intersection. Colton is a working-class community with diverse neighborhoods. The population exceeds 50,000 residents.
Fontana
Fontana is a major city in the western part of the county. It incorporated in 1952. The city grew rapidly after World War II. It was historically dominated by the Kaiser Steel Mill. After the steel industry declined, Fontana diversified. It is now a major residential and logistics center. The city is home to Auto Club Speedway, a NASCAR racetrack. Fontana has extensive warehouse and distribution facilities. The population exceeds 200,000 residents.
Grand Terrace
Grand Terrace is a small city nestled on a terrace above Colton. It incorporated in 1978. The city sits at the base of the San Bernardino Mountains. It is primarily residential with a small-town atmosphere. Grand Terrace offers panoramic views of the valley below. The city is known for its quiet, family-oriented neighborhoods. The population is approximately 12,000 residents.
Hesperia
Hesperia is a city in the Victor Valley region. It incorporated in 1988. The city sits along Interstate 15 in the High Desert. Hesperia has experienced rapid growth with new housing developments. It is known for its rural character and horse-friendly properties. The city features the Hesperia Golf & Country Club. The Mojave River flows through the community. The population exceeds 100,000 residents.
Highland
Highland is a city east of San Bernardino. It incorporated in 1987. The city sits at the base of the San Bernardino Mountains. Highland is a residential community with growing commercial areas. It is home to the San Manuel Stadium. The city hosts the Highland Fair. Highland has a diverse population and family-oriented neighborhoods. The population exceeds 55,000 residents.
Loma Linda
Loma Linda is a unique city known for its health focus. It incorporated in 1970. The name means “Beautiful Hill” in Spanish. Loma Linda is a Seventh-day Adventist community. It is home to Loma Linda University Medical Center, a world-renowned hospital. The city is a Blue Zone, known for the longevity of its residents. It has strict health-focused zoning, including no tobacco sales. The population is approximately 25,000 residents.
Montclair
Montclair is a city in the southwestern part of the county. It incorporated in 1956. The city sits along Interstate 10. It is part of the Pomona Valley urban area. Montclair is known for the Montclair Plaza shopping center. The city is primarily residential with significant retail. It is a working-class community with diverse neighborhoods. The population exceeds 40,000 residents.
Needles
Needles is the county’s easternmost city. It incorporated in 1913. The city sits on the Colorado River. It is named after the Needles Peaks, sharp rock formations across the river. Needles has a rich Route 66 and railroad history. It experiences extreme desert heat in summer. The city serves as a gateway to recreation on the Colorado River. The population is approximately 5,000 residents.
Ontario
Ontario is a major city in the western county. It incorporated in 1891. The city was founded by the Chaffey brothers as a planned agricultural colony. It is now a massive logistics and commercial hub. Ontario is home to Ontario International Airport, a major passenger and cargo airport. The city hosts the Ontario Convention Center and Ontario Mills shopping mall. Ontario has extensive warehouse and distribution facilities. The population exceeds 180,000 residents.
Rancho Cucamonga
Rancho Cucamonga is an affluent city in the western county. It incorporated in 1977 through the merger of several communities. The city sits at the base of the San Gabriel Mountains. It is known for its master-planned communities and excellent schools. Rancho Cucamonga is a major retail and employment center. It is home to the Victoria Gardens lifestyle center. The city has a strong wine history dating back to the 19th century. The population exceeds 180,000 residents.
Redlands
Redlands is a historic and culturally rich city. It incorporated in 1888. The city was founded during the citrus boom. It is known as the “Jewel of the Inland Empire.” Redlands features a beautiful historic downtown and the University of Redlands. The city has stunning architecture including Kimberly Crest mansion. It is home to the Redlands Bowl, the nation’s oldest free summer concert series. Redlands has a strong sense of history and community. The population exceeds 70,000 residents.
Rialto
Rialto is a city in the San Bernardino Valley. It incorporated in 1911. The city is named after the Rialto Bridge in Venice, Italy. Rialto has a diverse population and working-class neighborhoods. It is home to the Rialto Unified School District. The city hosts the Rialto Police Department and extensive public services. Rialto has significant warehouse and distribution facilities. The population exceeds 100,000 residents.
San Bernardino
San Bernardino is the county seat and largest city. It incorporated in 1854, making it one of California’s oldest cities. The city was founded by Mormon pioneers. It is the economic and governmental center of the county. San Bernardino is home to Cal State San Bernardino. The city has a rich Route 66 heritage. It faces significant economic challenges but remains the county’s anchor. The population exceeds 220,000 residents.
Twentynine Palms
Highland is a city east of San Bernardino. It incorporated in 1987. The city sits at the base of the San Bernardino Mountains. Highland is a residential community with growing commercial areas. It is home to the San Manuel Stadium. The city hosts the Highland Fair. Highland has a diverse population and family-oriented neighborhoods. The population exceeds 55,000 residents.
Upland
Loma Linda is a unique city known for its health focus. It incorporated in 1970. The name means “Beautiful Hill” in Spanish. Loma Linda is a Seventh-day Adventist community. It is home to Loma Linda University Medical Center, a world-renowned hospital. The city is a Blue Zone, known for the longevity of its residents. It has strict health-focused zoning, including no tobacco sales. The population is approximately 25,000 residents.
Victorville
Victorville is the largest city in the Victor Valley. It incorporated in 1962. The city sits along Interstate 15 in the High Desert. Victorville is a major commercial and retail hub for the region. It is home to the San Bernardino County Fair. The city hosts the Southern California Logistics Airport, a former Air Force base. Victorville has extensive warehousing and film production facilities. The population exceeds 130,000 residents.
Yucaipa
Yucaipa is a city in the eastern San Bernardino Valley. It incorporated in 1989. The city sits at the base of the San Bernardino Mountains. Yucaipa is primarily residential with a rural feel. It is known for its apple orchards and parks. The city has a strong sense of community and active senior population. Yucaipa is home to Crafton Hills College. The population exceeds 55,000 residents.
Yucca Valley
Yucca Valley is a town in the Morongo Basin. It incorporated in 1991. The town sits at the western edge of Joshua Tree National Park. Yucca Valley is named for the Joshua trees that dot the landscape. It is a gateway community for visitors to the park. The town has a distinct high desert character and artistic community. Yucca Valley is primarily residential with local retail. The population exceeds 20,000 residents.
Vast, Diverse, and Unforgettable
San Bernardino County offers unparalleled diversity and opportunity. You can ski in morning and visit desert in afternoon. You explore ghost towns and modern cities. The county provides both wilderness adventure and urban convenience.
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