Map of Indiana Counties

Indiana has 92 counties, the 12th most of any U.S. state. Indiana reached 92 in 1859, when Newton County was organized in its present form. Counties are the state's main level of local government, and each one has a county seat, from Indianapolis in Marion County to Kentland in Newton County and Rising Sun in Ohio County. The counties are similar in size. 71 of the 92 have between 300 and 500 square miles (777 to 1,295 km²) of land, per the 2026 Census Gazetteer Files, which gives central and northern Indiana a grid-like pattern.

Allen County, in northeast Indiana, is the largest county by land area at 657.1 square miles (1,702 km²), according to the U.S. Census Bureau's 2026 Gazetteer Files. Its county seat is Fort Wayne, Indiana's second-largest city. LaPorte County, on Lake Michigan, ranks second at 598.3 square miles (1,550 km²), and Jasper County is third at 559.7 square miles (1,450 km²). Allen County has about 7.6 times the land of Ohio County, the smallest at 86.2 square miles (223 km²). Allen also ranks third in population, with 399,295 residents on July 1, 2024 (Census Bureau, Vintage 2024), behind Marion and Lake counties.

Marion County is the most populous county in Indiana, with 981,628 residents on July 1, 2024, according to U.S. Census Bureau estimates (Vintage 2024). Marion County contains Indianapolis, the state capital, and about 14% of Indiana's 6,924,275 people. Lake County, which includes Gary, is second with 502,955. Allen County (Fort Wayne) follows with 399,295, then Hamilton County with 379,704. Hamilton County, where Carmel, Fishers and Noblesville are located, gained 30,673 residents between the 2020 and 2024 estimates, the largest increase of any Indiana county. Marion County has only 396 square miles (1,026 km²) of land, which ranks 47th of the 92 counties.

Indianapolis, the capital of Indiana, is in Marion County. The city and county have shared a consolidated government, known as Unigov, since 1970, so most of Marion County is governed as the City of Indianapolis. A few communities inside the county still have their own town or city governments, including Beech Grove, Lawrence, Southport and Speedway, the town where the Indianapolis Motor Speedway is located. Marion County had 981,628 residents on July 1, 2024 (Census Bureau, Vintage 2024), the most in the state. The county is named for Francis Marion, the Revolutionary War general known as the Swamp Fox. Its seven neighbors are Hamilton, Hancock, Shelby, Johnson, Morgan, Hendricks and Boone counties.

Twelve of Indiana's 92 counties use Central Time, and the other 80 use Eastern Time. The Central Time counties are in two corners of the state. In the northwest, close to Chicago, they are Jasper, Lake, LaPorte, Newton, Porter and Starke. In the southwest, around Evansville, they are Gibson, Perry, Posey, Spencer, Vanderburgh and Warrick. Both areas have close commuting and trade links to places on Central Time: Chicago in the north, and western Kentucky and the Evansville area in the south. Every Indiana county has observed daylight saving time since 2006. Before then, most of the state stayed on Eastern Standard Time all year, so older maps and guides often show a different split.

Ohio County is the smallest county in Indiana by both land area and population. Ohio County has 86.2 square miles (223 km²) of land, according to the Census Bureau's 2026 Gazetteer Files, and had 5,996 residents on July 1, 2024 (Census Bureau, Vintage 2024). It was created in 1844, and its county seat, Rising Sun, is on the Ohio River across from Kentucky. The county is named for the Ohio River, not for the state of Ohio. Floyd County, home to New Albany, is the next smallest by land at 148.5 square miles (385 km²). Union County is the next smallest by population, with 6,884 residents in 2024.

Knox County is the oldest county in Indiana. It was created in 1790, when the region was part of the Northwest Territory, and its seat, Vincennes, is the oldest city in the state. Clark County followed in 1801 and Dearborn County in 1803, both on the Ohio River. Thirteen counties, including Harrison, Wayne and Posey, have founding years before 1816, the year Indiana became the 19th state on December 11. Newton County, on the Illinois line in the northwest, is the newest. It was organized in its present form in 1859 and brought the total to 92. The last counties formed before Newton were Benton in 1840 and Howard, Ohio and Tipton in 1844.

Three Indiana counties border Lake Michigan: Lake, Porter and LaPorte. All three are in the state's northwest corner and on Central Time. In the Census Bureau's 2026 Gazetteer Files, Lake County has 127.7 square miles (331 km²) of water area and Porter County has 103.7 square miles (269 km²), the two highest totals in Indiana. Most of that water is the lake itself. Indiana Dunes National Park runs along the shore in Lake, Porter and LaPorte counties, and Michigan City is LaPorte County's lakefront city. Lake County had 502,955 residents in 2024 and includes Gary, but its county seat is Crown Point. Valparaiso is the seat of Porter County, and LaPorte is the seat of LaPorte County.

You can build a custom map of Indiana in the Ultimaps editor, which is free to use with no account. List the 92 county names in one spreadsheet column and your values in the next, then import the file. Each county is colored on a scale, and a legend is added. If only a few counties matter, click each one, for example Tippecanoe or Vigo, and set its color directly. Pins mark exact points, such as a warehouse in Plainfield or a dealer in Elkhart. After that, adjust the palette, borders, labels and title. Exporting a standard PNG with a small Ultimaps credit is free. High-resolution PNG, SVG and PDF exports come with the Pro plan.