Indiana Citizen Population By County in 2018 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen population for Indiana was 6,430,185 and represented 96.88% of the total Indiana population.

Among all Indiana counties, Marion had the highest citizen population (882.89K), followed by Lake (472.64K), and Allen (357.56K).

In terms of percentages, Crawford had the highest percentage of its population being citizens (100.00%), followed by Sullivan (99.90%), and Washington (99.87%).

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 2018

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

See this for other years:

Indiana Citizen Population By County in 2018

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County	Citizen Population	% of County Population
Marion	882885	93.47
Lake	472635	97.08
Allen	357555	96.63
Hamilton	304055	96.19
St. Joseph	259190	96.27
Elkhart	192515	94.55
Vanderburgh	178370	98.38
Tippecanoe	172795	91.28
Porter	165680	98.60
Hendricks	157590	97.92
Johnson	148215	97.79
Monroe	136620	93.96
Madison	127980	98.82
Delaware	113935	98.55
Clark	113600	98.19
LaPorte	108885	98.49
Vigo	105385	97.86
Howard	81445	98.86
Kosciusko	76715	97.35
Floyd	76020	98.97
Bartholomew	74820	91.36
Hancock	72935	98.79
Morgan	69285	99.37
Grant	66665	99.58
Wayne	65770	98.73
Boone	62955	97.88
Warrick	60920	98.37
Dearborn	49325	99.65
Henry	48285	99.59
Noble	46045	97.04
Lawrence	45350	99.41
Marshall	45180	96.96
Shelby	43485	97.94
Jackson	42475	96.67
DeKalb	42455	99.42
Dubois	41210	97.15
Harrison	39435	99.31
LaGrange	38430	98.69
Montgomery	37385	97.68
Knox	37235	99.53
Putnam	36935	98.34
Huntington	36020	99.01
Miami	35645	99.29
Cass	35520	93.27
Adams	35045	99.57
Steuben	33865	98.23
Whitley	33435	99.36
Gibson	33275	99.05
Jasper	32965	98.55
Daviess	32230	97.86
Greene	32135	99.51
Jefferson	32060	99.46
Wabash	31400	99.27
Clinton	30595	94.72
Ripley	28220	99.28
Washington	27790	99.87
Wells	27775	99.39
Jennings	27465	99.06
Decatur	26270	98.95
Clay	26210	99.77
Posey	25500	99.65
Randolph	24790	98.86
Scott	23545	99.16
White	23375	96.53
Fayette	23200	99.74
Franklin	22770	99.69
Starke	22735	99.11
Jay	20875	99.43
Owen	20780	99.52
Sullivan	20770	99.90
Spencer	20390	99.34
Fulton	19800	97.97
Carroll	19690	98.48
Orange	19400	99.26
Perry	19010	99.32
Parke	16840	99.09
Rush	16645	99.64
Fountain	16310	98.94
Vermillion	15460	99.36
Tipton	15075	99.05
Brown	14975	99.60
Newton	13610	97.08
Pulaski	12590	99.45
Pike	12385	99.80
Blackford	12035	99.22
Crawford	10580	100.00
Switzerland	10560	99.34
Martin	10190	99.80
Benton	8585	99.08
Warren	8220	99.70
Union	7060	98.67
Ohio	5870	99.75