Indiana Citizen Population By County in 2021 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen population for Indiana was 6,536,390 and represented 96.82% of the total Indiana population.

Among all Indiana counties, Marion had the highest citizen population (904.75K), followed by Lake (481.59K), and Allen (367.84K).

In terms of percentages, Crawford had the highest percentage of its population being citizens (100.00%), followed by Martin (99.95%), and Ohio (99.92%).

The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.

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

You may also be interested in:
Indiana Citizen Voting-age Population By County in 2021

Data Source: US Census - ACS 5-Year (CVAP).

See this for other years:

Indiana Citizen Population By County in 2021

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County	Citizen Population	% of County Population
Marion	904745	93.32
Lake	481585	97.11
Allen	367840	96.33
Hamilton	326645	95.62
St. Joseph	262045	96.32
Elkhart	196485	95.24
Vanderburgh	175990	97.94
Tippecanoe	170085	91.46
Porter	169655	98.43
Hendricks	168670	98.01
Johnson	156640	98.06
Monroe	132295	94.37
Madison	128610	98.90
Clark	117595	97.85
Delaware	111215	98.88
LaPorte	110310	98.33
Vigo	104655	98.25
Howard	82630	99.14
Floyd	78495	98.62
Hancock	77900	99.09
Kosciusko	77390	96.56
Bartholomew	74630	91.28
Morgan	70755	99.10
Boone	68240	97.71
Grant	66225	99.14
Wayne	65425	98.25
Warrick	62255	97.92
Dearborn	50285	99.58
Henry	48725	99.73
Noble	45815	96.87
Marshall	44925	97.29
Lawrence	44855	99.38
Shelby	44015	98.19
Jackson	43880	95.50
DeKalb	42850	99.51
Dubois	42040	96.70
LaGrange	39690	99.02
Harrison	39205	99.22
Montgomery	37270	98.17
Huntington	36190	98.96
Putnam	36155	98.14
Knox	35980	98.96
Cass	35830	94.49
Miami	35700	98.89
Adams	35455	99.36
Steuben	34160	99.36
Whitley	33935	99.66
Jefferson	32745	99.23
Gibson	32510	98.47
Jasper	32500	98.47
Daviess	32490	97.63
Clinton	31160	94.40
Wabash	30975	99.53
Greene	30700	99.27
Ripley	28760	99.33
Washington	27960	99.77
Wells	27870	99.16
Jennings	27430	99.31
Clay	26335	99.77
Decatur	26045	98.41
Posey	25200	99.61
Randolph	24420	98.95
Scott	24200	99.63
White	23815	96.83
Fayette	23245	99.36
Starke	23140	99.42
Franklin	22685	99.63
Owen	21240	99.81
Sullivan	20755	99.71
Jay	20395	99.15
Carroll	20030	98.72
Fulton	20000	98.04
Orange	19680	99.65
Spencer	19640	98.45
Perry	19070	99.58
Rush	16635	99.58
Fountain	16325	99.42
Parke	16255	99.63
Vermillion	15395	99.48
Brown	15295	99.03
Tipton	15195	99.38
Newton	13565	97.84
Pulaski	12390	99.16
Pike	12170	99.59
Blackford	12075	99.47
Crawford	10510	100.00
Martin	9880	99.95
Switzerland	9860	99.90
Benton	8545	98.39
Warren	8400	99.64
Union	6985	98.38
Ohio	5925	99.92