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What are the largest counties in Indiana?

Marion County is the largest county in Indiana, with 992,196 residents in 2025 (Census PEP). Lake County (504,612) and Allen County (402,329) come next.

Data as of 2025 · updated

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All 92 ranked Indiana counties

Indiana counties ranked by population
RankCountyResidents 2025Change 2020–25
1Marion County992,196+1.6%
2Lake County504,612+1.1%
3Allen County402,329+4.2%
4Hamilton County387,036+10.9%
5St. Joseph County272,861+0.1%
6Elkhart County208,774+0.9%
7Hendricks County193,510+10.2%
8Tippecanoe County190,456+2.2%
9Vanderburgh County181,995+0.9%
10Porter County176,049+1.6%
11Johnson County174,262+7.4%
12Monroe County143,345+1.9%
13Madison County135,088+3.8%
14Clark County130,451+7.5%
15Delaware County113,106+1.2%
16LaPorte County111,294−0.9%
17Vigo County106,512+0.3%
18Hancock County90,969+13.5%
19Bartholomew County85,729+4.3%
20Howard County83,904+0.4%
21Floyd County82,153+2.0%
22Kosciusko County80,892+0.9%
23Boone County80,689+13.5%
24Morgan County74,967+4.3%
25Warrick County66,803+4.4%
26Grant County66,524+0.0%
27Wayne County66,169−0.5%
28Dearborn County51,609+1.7%
29Henry County49,137+0.5%
30Noble County47,937+1.0%
31Jackson County47,370+1.9%
32Marshall County46,599+1.2%
33Shelby County45,882+1.8%
34Lawrence County45,568+1.2%
35DeKalb County44,535+2.9%
36Dubois County44,016+0.9%
37LaGrange County41,305+1.9%
38Harrison County40,437+1.9%
39Montgomery County38,954+2.7%
40Putnam County37,876+3.2%
41Cass County37,836+0.1%
42Huntington County37,224+1.6%
43Adams County36,650+2.2%
44Knox County35,652−1.7%
45Whitley County35,046+2.1%
46Steuben County34,799+1.0%
47Miami County34,487−4.0%
48Daviess County34,209+2.5%
49Jasper County33,894+3.0%
50Clinton County33,322+0.4%
51Jefferson County33,279+0.6%
52Gibson County33,091+0.1%
53Greene County31,165+1.2%
54Wabash County30,713−0.7%
55Ripley County29,434+1.6%
56Wells County28,883+2.6%
57Washington County28,383+0.5%
58Jennings County27,622+0.1%
59Decatur County26,576+0.4%
60Clay County26,410−0.1%
61White County25,164+2.0%
62Scott County25,053+2.8%
63Posey County24,988−0.8%
64Randolph County24,438+0.1%
65Fayette County23,533+0.7%
66Starke County23,425+0.1%
67Franklin County23,286+2.2%
68Owen County21,886+2.6%
69Sullivan County20,831+0.1%
70Carroll County20,655+1.6%
71Jay County20,118−1.8%
72Fulton County20,091−1.9%
73Spencer County20,061+1.2%
74Orange County19,834−0.1%
75Perry County19,389+1.2%
76Fountain County17,013+3.2%
77Rush County16,767+0.0%
78Parke County16,642+3.0%
79Brown County15,777+1.9%
80Vermillion County15,488+0.6%
81Tipton County15,319−0.5%
82Newton County14,188+2.9%
83Pulaski County12,463−0.4%
84Pike County12,003−2.0%
85Blackford County11,730−3.1%
86Crawford County10,509−0.2%
87Switzerland County10,037+3.0%
88Martin County9,856+0.5%
89Benton County8,883+2.0%
90Warren County8,474+0.6%
91Union County6,863−3.1%
92Ohio County5,994+1.1%

How this is ranked

The Census Bureau's July 1 resident population estimates for 2025, largest first, with the change since 2020. Counties with fewer than 1,000 residents are not ranked. Areas without an estimate for the same year as the others are not ranked.

Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025). Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how ranks and figures are built.

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Questions

What is the largest county in Indiana?

Marion County is the largest county in Indiana, with 992,196 residents in 2025 (Census PEP). Lake County (504,612) and Allen County (402,329) come next.

How is this ranking calculated?

The Census Bureau's July 1 resident population estimates for 2025, largest first, with the change since 2020. Counties with fewer than 1,000 residents are not ranked. Areas without an estimate for the same year as the others are not ranked.

More rankings for Indiana

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