Interesting San Bernardino County Facts

San Bernardino County is physically the largest county in the contiguous United States. It is larger than 15 states geographically and 16 states by population. San Bernardino County was founded by a bill introduced by Assembly Member Jefferson Hunt. The County was officially created on April 26, 1853, from parts of Los Angeles, San Diego, and Mariposa County. The original geographical size included a significant portion of present-day Riverside County until 1893.  Learn more about the fourth supervisorial district and current-day San Bernardino County by reading on.  

The size of San Bernardino County in relationship to the size of orange county map
The size of San Bernardino County in relationship to the size of Orange County.

By the Numbers

21,105
Size in square miles of San Bernardino County, the largest county in the contiguous United States
24
Incorporated cities in San Bernardino County
2.2m
Population (2019)
82%
Land area that is vacant
13%
Land area used for military purposes
The lake at Prado Park
A Veteran's Day Banner in the City of Upland
The Toyota Arena at sunset
BAPS at night lit up in pinks and purples
Housing community and mountain view from Chino Hills

The Fourth District

Fourth District Statistics

Key Facts:
Square Miles – 140.85
Median Household Income – $84,747
Population Median Age – 33.9
Households – 137,580

Education:
17% – No High School Diploma
24% – High School Graduate
30% – Some College
29% – Bachelor’s/Graduate/Professional Degree

Honored to Serve You

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

  • Chino
  • Chino Hills
  • Montclair
  • Ontario
  • Upland (generally below W. 14th St.)

View District Map