Riverside–San Bernardino–Ontario metropolitan area

Riverside–San Bernardino–Ontario metropolitan area
Name	Riverside–San Bernardino–Ontario metropolitan area
Other name	Inland Empire
Settlement type	Metropolitan area
Subdivision type	Country
Subdivision name	United States
Subdivision type1	State
Subdivision name1	California
Subdivisions	Riverside County, San Bernardino County

Riverside–San Bernardino–Ontario metropolitan area is a metropolitan region in the southern portion of California's Southern California comprising Riverside County and San Bernardino County. The area, commonly called the Inland Empire, sits east of the Los Angeles metropolitan area and west of the Mojave Desert, forming a transitional zone between coastal megaregions and interior deserts. Major cities include Riverside, San Bernardino, Ontario, Corona, Fontana, and Rancho Cucamonga.

Geography and Environment

The region occupies a basin bounded by the San Gabriel Mountains to the west, the San Bernardino Mountains to the north, and the Santa Ana Mountains to the south, with drainage into the Santa Ana River and the Santa Margarita River. Prominent natural features include Mt. San Gorgonio, Big Bear Lake, and the foothill communities of Highland and Yucaipa, while the Mojave Desert influences climate in the Victor Valley and eastern reaches near Victorville and Hesperia. The regional climate varies from Mediterranean in valley floors—affecting citrus groves and vineyards—to alpine conditions in the high country near Mount San Jacinto State Park and San Gorgonio Wilderness. Environmental challenges involve water allocation from the Colorado River and State Water Project, air quality influenced by transport from the Los Angeles basin and emissions from freight corridors like the Interstate 10 and Interstate 15, and habitat fragmentation threatening species protected under the California Endangered Species Act.

History and Development

Indigenous presence included the Tongva people, Cahuilla people, and Serrano people, with archaeological sites preserved around Perris and Morongo Valley. Spanish exploration and missions—most notably Mission San Gabriel Arcángel—preceded Mexican-era land grants such as the Rancho Cucamonga and Rancho San Bernardino owned by the Lugo family. After the Mexican–American War and the Treaty of Guadalupe Hidalgo, American settlement expanded with the arrival of railroads like the Southern Pacific Railroad and later railroads serving Los Angeles Harbor freight, stimulating growth in towns like Ontario—site of the Ontario International Airport—and Rialto. The 20th century saw boom periods tied to citrus and rail transportation followed by postwar suburban expansion influenced by the Interstate Highway System, defense projects during World War II, and the development of logistics hubs such as the Port of Los Angeles-linked inland ports. Recent development includes retail and entertainment centers like the Ontario Mills mall and the conversion of former military installations such as March Air Reserve Base.

Demographics

Census tracts and county data show diverse populations concentrated in urban corridors including Jurupa Valley and Chino. The region hosts large communities of Mexican American and Latino heritage, alongside populations with roots in the Filipino American and African American communities of San Bernardino, and growing Asian-American neighborhoods in Rancho Cucamonga and Ontario. Demographic trends include suburbanization, changing age distributions with both younger families and aging populations in exurban communities like Apple Valley, and migration tied to housing affordability compared with Los Angeles County and Orange County. Socioeconomic indicators vary between inland suburban employment centers such as Corona Business Park and historically industrial cities like Fontana and Colton.

Economy and Industry

The regional economy relies on logistics, warehousing, and distribution centers connected to the Port of Los Angeles supply chain, with major operators including UPS, FedEx, and freight carriers operating along the BNSF Railway and Union Pacific Railroad. Manufacturing clusters include firms originally attracted by lower land costs and proximity to I-10 and I-215, while agriculture maintains a presence in the Perris Valley and Valley of the Sun with citrus and nursery operations. Healthcare systems such as Loma Linda University Health and educational institutions including University of California, Riverside contribute to biomedical research and workforce development. Retail and tourism are anchored by venues like Toyota Arena in Ontario and recreational destinations including Big Bear Mountain Resort and Mission Inn Hotel & Spa in Riverside.

Transportation and Infrastructure

Major transportation corridors include I-10, I-15, I-210, SR 60, and rail freight arteries like BNSF Railway and Union Pacific Railroad. Passenger rail services comprise Metrolink commuter lines and the regional services of Amtrak California at stations in Oro Grande and Ontario. Airports include Ontario International Airport and proximity to John Wayne Airport and Los Angeles International Airport. Water infrastructure depends on the Colorado River Aqueduct and the State Water Project, while energy grids link to the California Independent System Operator network; contemporary planning debates involve freight congestion, expansion of passenger rail, and resilience to wildfires as seen around San Bernardino National Forest.

Government and Regional Planning

Local governance is carried out by counties such as Riverside County and San Bernardino County, municipal councils in cities like Corona and Fontana, and special districts including water agencies like the Inland Empire Utilities Agency. Regional planning efforts involve the Southern California Association of Governments and subregional councils addressing land use, housing mandates under the California Department of Housing and Community Development, transportation funding from the California Transportation Commission, and air quality regulation by the South Coast Air Quality Management District. Collaborative initiatives span economic development partnerships with California State University, San Bernardino and cross-jurisdictional hazard mitigation tied to the U.S. Forest Service and Federal Emergency Management Agency.

Culture, Education, and Recreation

Cultural institutions include the Riverside Art Museum, the California Citrus State Historic Park, and performance venues such as the Fox Performing Arts Center. Higher education centers include University of California, Riverside, California State University, San Bernardino, and community colleges like Norco College. Sports and recreation range from minor-league baseball at San Bernardino County Stadium and hockey at Toyota Arena to outdoor activities in Joshua Tree National Park's vicinity and skiing at Mount Baldy and Big Bear Lake. Festivals and community events feature the Riverside Festival of Lights, Ontario Town Square events, and cultural celebrations at institutions such as Mission Inn and the San Bernardino County Museum.

Category:Metropolitan areas of Southern California