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San Bernardino County on the map of California as of 2025. Cities, roads, borders and directions in San Bernardino County of California.

USA / California / San Bernardino County

San Bernardino County is the largest county in mainland US by area. The county spans over 20,105 square miles and includes some large cities. The official site of San Bernardino County is www.sbcounty.gov. The county seat is the city of San Bernardino. This map shows the borders of San Bernardino County as well as neighboring counties, including major highways and natural objecsts as of 2025. Zoom in or out of the map using the plus/minus panel. Move the center of this map by dragging it. Also check out the satellite map of San Bernardino County.