Map of US Counties

Ada County is located in the southwestern part of Idaho, United States. As of the 2021 United States census estimate, the county had a population of 511,931, making it by far the state’s most populous county; it is home to 26.8% of the state’s population. The county seat and largest city is Boise, which is ... Read more

Clark County is a rural county in the U.S. state of Idaho; its county seat and largest city is Dubois. As of the 2020 Census, the county had a population of 790, making it the least populous county in the state. Clark County overview: Name: Clark County FIPS code: 16-033 State: Idaho Founded: February 1, ... Read more

Madison County is a county located in the U.S. state of Idaho. As of the 2020 census, the population was 52,913. The county seat and largest city is Rexburg. Madison County is part of the Rexburg, Idaho micropolitan area, which is also included in the Idaho Falls metropolitan area. Madison County overview: Name: Madison County ... Read more

Brown County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 6,937. Its county seat is Mount Sterling. Siloam Springs State Park is located partly in this county. Brown County overview: Name: Brown County FIPS code: 17-009 State: Illinois Founded: 1839 Named for: Jacob Brown Seat: ... Read more

Douglas County is a county located in the U.S. state of Illinois. As of the 2020 United States Census, the population was 19,740. The county seat is Tuscola. Douglas County overview: Name: Douglas County FIPS code: 17-041 State: Illinois Founded: 1859 Named for: Stephen A. Douglas Seat: Tuscola Largest city: Tuscola Total Area: 417 sq mi (1,080 km²) ... Read more

Henry County is a county located in the U.S. state of Illinois. The 2010 United States Census, listed its population at 50,486. Its county seat is Cambridge. Henry County is included in the Davenport–Moline–Rock Island, IA-IL Metropolitan Statistical Area. Henry County overview: Name: Henry County FIPS code: 17-073 State: Illinois Founded: 13 January 1825 Named ... Read more

Lee County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 36,031. Its county seat is Dixon. The Dixon, IL Micropolitan Statistical Area includes all of Lee County. Lee County overview: Name: Lee County FIPS code: 17-103 State: Illinois Founded: February 27, 1839 Named ... Read more

Montgomery County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 30,104. Its county seat is Hillsboro. Montgomery County overview: Name: Montgomery County FIPS code: 17-135 State: Illinois Founded: 1821 Named for: Richard Montgomery Seat: Hillsboro Largest city: Litchfield Total Area: 710 sq mi (1,800 km²) Land ... Read more

Schuyler County is a county in the U.S. state of Illinois. According to the 2010 census, it had a population of 7,544. Its county seat is Rushville. Schuyler County overview: Name: Schuyler County FIPS code: 17-169 State: Illinois Founded: 1825 Named for: Philip Schuyler Seat: Rushville Largest city: Rushville Total Area: 441 sq mi (1,140 km²) Land Area: ... Read more

Winnebago County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 285,350 making it the seventh most populous county in Illinois behind Cook County and its five surrounding collar counties. Its county seat is Rockford. Winnebago County is the central county of the Rockford ... Read more

DeKalb County is a county in the U.S. state of Indiana. As of the 2020 United States Census, the population was 43,265. The county seat is Auburn. DeKalb County overview: Name: DeKalb County FIPS code: 18-033 State: Indiana Founded: 7 February 1835 (authorized)1837 (organized) Named for: Johann, Baron de Kalb Seat: Auburn Largest city: Auburn ... Read more

Harrison County is located in the far southern part of the U.S. state of Indiana along the Ohio River. The county was officially established in 1808. Its county seat is Corydon, the former capital of Indiana. Harrison County is part of the Louisville-Jefferson County, KY-IN Metropolitan Statistical Area. The county has a diverse economy with ... Read more