Indiana Counties by Population (2025)

Top 5 Most Populous Counties

Indiana flag Marion County

966,934

Indiana flag Lake County

502,480

Indiana flag Allen County

400,347

Indiana flag Hamilton County

384,009

Indiana flag St. Joseph County

273,980

92 counties

County
2025 Pop. ↓
Area (mi²)
Density
Change (2020)
Marion County966,9343962,442-1%
Lake County502,4804991,0070.71%
Allen County400,3476576093.69%
Hamilton County384,00939497510.03%
St. Joseph County273,9804585980.48%
Elkhart County205,481463444-0.73%
Hendricks County192,9234074749.87%
Tippecanoe County189,9024993811.89%
Vanderburgh County180,304233774-0.02%
Porter County176,3094184221.73%
Johnson County172,0853205386.07%
Monroe County138,784395351-0.57%
Madison County134,7464522983.52%
Clark County127,9573723445.44%
Delaware County112,6373922870.78%
LaPorte County111,474598186-0.71%
Vigo County106,2954042630.16%
Hancock County92,26430630215.07%
Bartholomew County85,2214072093.65%
Howard County84,4012932880.97%
Floyd County81,1851485490.83%
Kosciusko County79,964531151-0.22%
Boone County79,74242318912.1%
Morgan County75,1614041864.63%
Warrick County67,1393851744.91%
Grant County66,6144141610.16%
Wayne County65,949402164-0.84%
Dearborn County51,8453051702.16%
Henry County49,1573921250.52%
Noble County47,8224111160.76%
Jackson County46,920510920.95%
Marshall County46,3004441040.5%
Shelby County45,3154111100.57%
DeKalb County44,9683631243.87%
Lawrence County44,790449100-0.5%
Dubois County43,6544271020.03%
LaGrange County41,0133801081.16%
Harrison County40,438484841.92%
Montgomery County39,081505773.02%
Putnam County38,113481793.88%
Cass County37,924412920.37%
Huntington County36,743383960.26%
Adams County36,5623391081.99%
Knox County36,458516710.56%
Steuben County35,2073091142.22%
Miami County35,11437494-2.21%
Whitley County35,0723361042.16%
Daviess County33,976430791.86%
Jasper County33,915560613.06%
Jefferson County33,296361920.59%
Gibson County32,70848767-1.03%
Clinton County32,65240581-1.59%
Greene County31,446542582.12%
Wabash County30,32641373-1.97%
Ripley County29,621446662.21%
Wells County29,069368793.25%
Washington County28,273514550.12%
Jennings County27,898377741.15%
Clay County26,560358740.5%
Decatur County26,28937370-0.7%
White County25,431505503.07%
Scott County24,9711901312.44%
Posey County24,92440961-1.04%
Randolph County23,94845253-1.91%
Fayette County23,308215108-0.22%
Starke County23,21230975-0.79%
Franklin County23,122384601.47%
Owen County21,622385561.43%
Sullivan County20,929447470.56%
Carroll County20,547372551.02%
Fulton County20,33836855-0.64%
Spencer County20,032397501%
Jay County19,86038452-3%
Orange County19,71239850-0.7%
Perry County19,213382500.3%
Rush County17,197408422.59%
Fountain County16,953396432.8%
Parke County16,718445383.52%
Brown County15,785312511.94%
Vermillion County15,38525760-0.16%
Tipton County15,11826158-1.78%
Newton County14,202402352.92%
Pulaski County12,25743428-2.06%
Pike County12,03233436-1.77%
Blackford County11,84116572-2.18%
Crawford County10,28030634-2.32%
Switzerland County10,039221452.99%
Martin County10,037336302.32%
Benton County8,843406221.47%
Warren County8,578365241.84%
Union County6,98516143-1.37%
Ohio County5,8188668-1.86%

Overview of Indiana Counties

There are 92 counties in Indiana.

The most populous county located in the state of Indiana is Marion County, home of Indianapolis, which, as of 2019, has a population of 954,670. Since the time that the last census was taken in 2010, Marion County has seen an increase in the total population of 5.35%.

The next most populous counties in the state of Indiana after Marion County are:

Of these counties, only Lake County experienced a decline, dropping 2.32% in population. Hamilton County had the most significant growth with a growth rate of 19.38% since the 2010 census.

Indiana Counties with the Fewest Residents

The county with the lowest population in the state of Indiana is Ohio County, which has a population of 5,844. Since the last census in 2010, Ohio County’s population has seen a decrease of -4.12%.

Following Ohio County are:

All of these counties experienced a decline in the number of residents.

Indiana Counties with Rapid Growth

The county with the most rapid population growth was Hamilton County, home of Noblesville, which grew 19.38% to 330,086.

Following Hamilton County are:

The counties with the most significant population loss are:

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)