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The largest county in the United States is San Bernardino County, California with 20,105.32 square miles.
San Bernardino county is the largest county in California.
According to the 2010 U.S. Census, Los Angeles County.
By area, the third largest California city is, oddly enough, California City (Kern County) with an area of 203.52 sq mi (527.1 km2).
San Bernardino County in California is the largest county in the contiguous United States by land area.
By population it is Los Angeles County, California (10 million +) and by area it is San Bernardino County, California (21,000 square miles). The largest "county equivalent" by area is Yukon-Koyukuk Census Area in Alaska (147,805 square miles). It is part of Alaska's Unorganized Borough and has no county seat. Its population is less than 6000.
The five largest counties by land area in the United States are San Bernardino County (California), Coconino County (Arizona), Nye County (Nevada), Elko County (Nevada), and Mohave County (Arizona).
San Bernardino County is the second largest county in California geographically. It covers a vast area of deserts, mountains, and forests in Southern California. Its size makes it larger than some states in the US.
The term is county, not country, and it is San Bernardino County. This is not only the largest county in California, but the largest county in any state. 20,105 square miles
Maricopa is the largest in population. Coconino County is the largest in area and the County Seat is Flagstaff.
Inyo County
LA County.