Indiana Population By County in 2015

Updated on January 29, 2024.

Based on the US Census Vintage data estimates, in 2015, the population of Indiana was 6,611,442. Among all Indiana counties, Marion had the highest population (940,152), followed by Lake (488,195), and Allen (367,508). Ohio was the least populated county (5,888).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can see similar information for other states and by state for the United States.

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Indiana Population By County in 2015
Indiana Population By County in 2015
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County Population % of State Population
Adams 34962 0.53
Allen 367508 5.56
Bartholomew 81516 1.23
Benton 8698 0.13
Blackford 12237 0.19
Boone 63080 0.95
Brown 15003 0.23
Carroll 19891 0.30
Cass 38079 0.58
Clark 114887 1.74
Clay 26406 0.40
Clinton 32372 0.49
Crawford 10556 0.16
Daviess 32819 0.50
Dearborn 49491 0.75
Decatur 26338 0.40
DeKalb 42511 0.64
Delaware 115814 1.75
Dubois 42329 0.64
Elkhart 203022 3.07
Fayette 23389 0.35
Floyd 76559 1.16
Fountain 16543 0.25
Franklin 22953 0.35
Fulton 20346 0.31
Gibson 33656 0.51
Grant 67543 1.02
Greene 32428 0.49
Hamilton 308623 4.67
Hancock 72441 1.10
Harrison 39537 0.60
Hendricks 157848 2.39
Henry 48662 0.74
Howard 82378 1.25
Huntington 36535 0.55
Jackson 43892 0.66
Jasper 33498 0.51
Jay 21135 0.32
Jefferson 32305 0.49
Jennings 27847 0.42
Johnson 149021 2.25
Knox 37784 0.57
Kosciusko 78562 1.19
LaGrange 38620 0.58
Lake 488195 7.38
LaPorte 110884 1.68
Lawrence 45571 0.69
Madison 129436 1.96
Marion 940152 14.22
Marshall 46746 0.71
Martin 10222 0.16
Miami 36023 0.55
Monroe 144432 2.19
Montgomery 38255 0.58
Morgan 69576 1.05
Newton 13978 0.21
Noble 47514 0.72
Ohio 5888 0.09
Orange 19628 0.30
Owen 20823 0.32
Parke 16974 0.26
Perry 19323 0.29
Pike 12399 0.19
Porter 167439 2.53
Posey 25621 0.39
Pulaski 12801 0.19
Putnam 37397 0.57
Randolph 25139 0.38
Ripley 28375 0.43
Rush 16709 0.25
St. Joseph 268567 4.06
Scott 23670 0.36
Shelby 44343 0.67
Spencer 20644 0.31
Starke 22864 0.35
Steuben 34489 0.52
Sullivan 20874 0.32
Switzerland 10616 0.16
Tippecanoe 186858 2.83
Tipton 15250 0.23
Union 7201 0.11
Vanderburgh 181600 2.75
Vermillion 15597 0.24
Vigo 107615 1.63
Wabash 31883 0.48
Warren 8272 0.13
Warrick 61563 0.93
Washington 27784 0.42
Wayne 67044 1.01
Wells 27854 0.42
White 24279 0.37
Whitley 33451 0.51