San Bernardino County is the largest county in the contiguous USA at approx 22,000 square miles. It's bigger then some of the Northeastern states. There are some counties in Alaska that are huge, but Alaska is a country all to itself.
New Mexico: 121,589.48 square miles.
3,537,441 square miles.
The 50 states of the US measure a total of 3,794,066 square miles, or 9,826,630 km²
Alaska 663,267.26 square miles ... followed by Texas 268,580.82, California 163,695.57, Montana 147,042.40, then New Mexico 121,589.48.
By population, the largest county in Wyoming is Laramie County 91,378 (2010 US Census). The smallest county by population is Niobrara County with 2,484 (2010 US Census). By area, the largest county in Wyoming is Sweetwater County with 10,425.30 square miles. The smallest county in Wyoming by area is Hot Springs County with 2,003.89 square miles.
By area, the two largest counties in Wyoming are: Sweetwater County 10,425.30 square miles Fremont County 9,182.27 square miles By population, the two largest counties in Wyoming are: Laramie County 91,378 (2010 US Census) Natrona County 75,450 (2010 US Census)
Washington DC is the capital city of the US. It does not have countries or cities.
In area, Sweetwater County is the largest county in Wyoming with a total area of 10,491 square miles (27,172 km²), of which 10,425 square miles (27,001 km²) is land and 66 square miles (171 km²) (0.63%) is water. Sweetwater county is also the 8th largest county in the US. By population, the largest county in Wyoming is Laramie County with a population of 91,738 according to the 2010 US Census.
Texas Counties and County Trivia: Texas has some large counties like its largest Brewster County at 6,193 square miles. Texas has no county that fits into the 25 largest counties (or equivalent units) in the US, with seven Alaska counties at 12,750 square miles each or larger.Pecos County at 4,764 square miles.Hudspeth County at 4,571 square miles.Presido County at 3,856 square miles.Webb County at 3,357 square miles.Val Verde County at 3,171 square miles.
McLean County which is larger than Rhode Island in total land acres. Its County Seat is Bloomington a city of about 75,000 and is the largest producer of both corn and soybeans of any US County. McLean County is about 1,184 square miles in size.
San Bernardino County in California is the largest county in the United States by size. It covers approximately 20,105 square miles.
It is 59,425 square miles and the 24th largest US State.
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 largest county in the state of Montana is Beaverhead County, with 5, 543 square miles. It is located in the South West corner of the state.The largest Montana county by size is Beaverhead County, which is 5,543 square miles.The largest Montana county by population is Yellowstone County, which has a population of 129,352.Montana is a US State and contains no states.
The 2000 US Census recorded 111,931 residents in St, Lawrence County which has a total area of 2,821 square miles..
Utah County, Utah is 2,141 square miles total. 1,998 square miles in land, and 143 square miles in water. The city of Provo is in Utah County. As of the 2010 census, the population is 516,564.