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Your Fourth District Office

Interesting San Bernardino County Facts

San Bernardino County is physically the largest county in the contiguous United States, and larger than 15 states in population.


Size in square miles of San Bernardino County, the largest county in the contiguous United States


Incorporated cities in San Bernardino County


Population (2019)


Land area that is vacant


Land area used for military purposes

Learn About County Programs

The Fourth District Office is your source for information about County Programs including, but not limited to:

  • Animal Care & Control
  • Environmental Health Services
  • Equal Opportunity Employment
  • Innovation and Technology Department
  • Land Use Services
  • Parks & Recreation
  • County Library
  • Public Health Department
  • Public Works Department
  • Registrar of Voters
  • Workforce Development
  • & More

Your Fourth District

San Bernardino County’s 2.2 million residents are divided into five geographically distinct districts. The Fourth District of San Bernardino County is a diverse and vibrant home to 477,000 residents. There are five robust cities within the district which boast many unique destinations and amenities. Residents and visitors alike can take advantage of the close proximity to Ontario Airport and plan a visit to Ontario Mills Mall or Toyota Arena in Ontario, spend a lazy afternoon at Prado Park or the Planes of Fame Museum at Chino Airport in Chino, take a hike at Chino Hills State Park or tour the remarkable BAPS Indian Temple complex in Chino Hills. Catch a concert at The Canyon Theater at Montclair Place in Montclair or a play at The Grove Theatre in the beautiful historical downtown Upland. Although smallest in physical size when compared to the other four county districts, the Fourth District has so much to offer our residents and visitors alike.

Certificates of Recognition

If you know someone who deserves to be recognized for their accomplishments or service to the community, the Fourth District Office can provide a certificate of recognition to congratulate them.

Request Certificates by Visiting:
  • Select: Request Forms
  • Select: Certificate of Recognition
Follow Supervisor Hagman

Honored to Serve You

The Fourth District of San Bernardino County includes the cities of:

  • Chino
  • Chino Hills
  • Montclair
  • Ontario
  • Upland*
    *(south of Foothill Blvd.)

Supervisor Curt Hagman