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The largest counties and county-equivalents are organized boroughs and the census areas of Alaska with the top two being Yukon–Koyukuk Census Area (145,504.79 sq mi or 376,855.7 km 2) and North Slope Borough (88,695.41 sq mi or 229,720.1 km 2).
- Los Angeles County (California) Estimated Population (2021): 9,861,224. Largest City: Los Angeles. Area Size: 4,751 sq mi (12,310 km2) Source: commons.wikimedia.org.
- Cook County (Illinois) Estimated Population (2021): 5,275,541. Largest City: Chicago. Area Size: 1,635 sq mi (4,230 km2) Source: commons.wikimedia.org. The densely populated city of Chicago is located in Cook County.
- Harris County (Texas) Estimated Population (2021): 4,728,030. Largest City: Houston. Area Size: 1,778 sq mi (4,600 km2) Source: www.flickr.com. Harris County is the largest county in the second-largest state in the US.
- Maricopa County (Arizona) Estimated Population (2021): 4,496,588. Largest City: Phoenix. Area Size: 9,224 sq mi (23,890 km2) Source: www.flickr.com. It might not be the most populous county on this list, but Maricopa County is the one with the largest area size.
- Alabama: Jefferson County. 2017 population estimate: 771,158. 2010 census population: 741,096. Growth rate (since 2010): 4.06% This county, named after President Thomas Jefferson, was established in 1819 and is home to the state’s largest city and industrial center—Birmingham.
- Alaska: Anchorage Municipality. 2017 population estimate: 294,356. 2010 census population: 291,826. Growth rate (since 2010): 0.87% Alaska is unique as one of only two states that uses boroughs instead of counties.
- Arizona: Maricopa County. 2017 population estimate: 4,307,033. 2010 census population: 3,817,117. Growth rate (since 2010): 12.83% This county is named for the Native American tribe that calls this region home.
- Arkansas: Pulaski County. 2017 population estimate: 393,956. 2010 census population: 382,748. Growth rate (since 2010): 2.93% Located in the geographic center of the state, Pulaski County serves as a major crossroads for national business and freight.
- 10 Largest Counties in The U.S
- What Is The Smallest County in The U.S.?
- Honorable Mention
10. Harney County, Oregon
At 10,226 square miles of total land and water surface area, Harney County is the tenth-largest county in the United States and the largest in Oregon. It is, in fact, larger in area than six U.S. States combined! Harney County was named in honor of William S. Barney, a popular military officer in 1889. The population of Harney County was 7,495 in 2020, making it the sixth-least populous county in Oregon. The county seat is in Burns and it is the tenth of the only 10 counties in the U.S. with...
9. Inyo County, California
With a total land and water surface area of 10,192 square miles, Inyo County is the ninth-largest county by area in the U.S. and the second-largest in California, after San Bernardino County. According to the 2020 census, the county has a population of 19,016, predominantly Whites. The county seat is in Independence. Notable attractions in Inyo County are Mushroom Rock, Mount Whitney, and Death Valley National Park.
8. Sweetwater County, Wyoming
The eighth-largest county in the United States, Sweetwater County has a total land and water surface area of 10,491 square miles –larger than six individual states put together! As of the 2020 United States Census, the population was 42,272, making it the fourth-most populous county in Wyoming. Its county seat is Green River and it was named after the Sweetwater River, which is a part of the Mississippi River system. Sweetwater County comprises the Green River, Rock Springs, and the Wyoming M...
When learning about the largest counties in the United States, it’s interesting to take a look at the opposite side of the spectrum in order to grasp just how big places like San Bernadino and Mohave County truly are. The smallest county in the U.S. is Alexandria, Virginia, which covers a mere 15.35 sq mi of territory. Despite its relatively tiny s...
In case you are curious, here are five more of America’s largest counties. Would you believe that you have to go down to #39 on the list to find one from Texas? 11. Navajo County, Arizona, 9,959 square miles, County Seat – Holbrook 12. Malheur County, Oregon, 9,930 square miles, County Seat – Vale 13. Humboldt County, Nevada, 9,658 square miles, Co...
- Los Angeles County, California – 10,014,009. Total Area: 4,751 sq mi or 12,310 km2. Population Density: 2,430/sq mi. Los Angeles County is the most populated county in the United States, with a total population of 10,014,009 residents.
- Cook County, Illinois – 5,275,541. Total Area: 1,635 sq mi or 4,230 km2. Population Density: 3,200/sq mi. With a population of 5,275,541, Cook County is the second most populated county in the United States.
- Harris County, Texas – 4,731,145. Total Area: 1,778 sq mi or 4,600 km2. Population Density: 2,700/sq mi. Located in the U.S. state of Texas, Harris County has a total of 4,731,145 residents, which accounts for 16% of the total population of Texas.
- Maricopa County, Arizona – 4,420,568. Total Area: 9,224 sq mi or 23,890 km2. Population Density: 480/sq mi. In the U.S. state of Arizona lies Maricopa County, with a population of 4,420,568.
Oct 8, 2021 · More than half of all residents live in just 143 big counties (in terms of the number of residents), according to an analysis of U.S. Census Bureau county estimates. That means less than half of the population is spread out across the remaining 2,999 small counties.
Oct 8, 2021 · California’s Los Angeles County remained the largest county in 2020, crossing the 10.0 million-person mark between 2010 and 2020. Population Change in Metro and Micro Areas. The population of around four-fifths (81%) of U.S. metro areas increased between 2010 and 2020 (Figure 2) but only 48% of U.S. micro areas grew over the decade.
