San Bernardino is the Biggest County in the US – Did You Know It Is Larger Than 9 Whole States?
Matthew Gray
October 10, 2025
San Bernardino County is huge. It covers almost 20,105 square miles in Southern California, making it the biggest county in the United States. It is so large that nine full states are smaller than it. You can drive for hours and still be inside the same county. The land includes busy cities, quiet deserts, and