Indiana County Area & Size Rankings

Understanding Indiana’s county areas

The land-area range runs from Ohio County at 86.2 mi² to Allen County at 657.1 mi². The largest has 7.6 times the land area of the smallest and accounts for 1.8% of the combined county land in Indiana. Compare with every state’s largest county.

The median county-equivalent land area is 396.4 mi², below the national median of 604.5 mi². The median describes the middle of the county size distribution; it does not describe how people or development are distributed. A state with a few very large counties can have a much smaller median than its largest entry suggests.

Where water changes the picture

Lake County has the most assigned water area, at 127.7 mi². It also has the highest water share, with water making up 20.4% of its total area. Water area and water percentage answer different questions: the first measures an amount, while the second measures the mix of land and water.

Across all 92 entries, water accounts for 1.6% of the combined total area. This is calculated from the summed land and water measurements, rather than averaging county percentages, which would give each small and large county equal weight.

Where people live

An estimated 6,973,333 people lived in Indiana on July 1, 2025 (+2.8% since 2020), or 2% of the national total in this dataset. Marion County is the most populous county equivalent, with 992,196 residents — 14.2% of the state. The largest by land, Allen County, has 402,329.

Across the state there are 195 people per square mile of land. County densities range from 2,506 in Marion County to 22 in Benton County; the median county equivalent has 88. Switch the map above to density to see where the state’s population concentrates.

Compare the largest and smallest county equivalents in Indiana to see land, water, and total area on the same scale.

These calculations use the 2026 Census county records listed below. County-equivalent boundaries vary between states; area alone does not measure population, density, or usable land. See coverage and calculation rules.

#	County / equivalent	Land	Water	Water share	Population	Per mi²
1	Allen CountyGEOID 18003	657.1 mi²	2.8 mi²	0.4%	402,329	612
2	LaPorte CountyGEOID 18091	598.3 mi²	15 mi²	2.4%	111,294	186
3	Jasper CountyGEOID 18073	559.7 mi²	1.7 mi²	0.3%	33,894	61
4	Greene CountyGEOID 18055	542.5 mi²	3.4 mi²	0.6%	31,165	57
5	Kosciusko CountyGEOID 18085	531.4 mi²	22.9 mi²	4.1%	80,892	152
6	Knox CountyGEOID 18083	515.8 mi²	8.1 mi²	1.5%	35,652	69
7	Washington CountyGEOID 18175	513.7 mi²	2.9 mi²	0.6%	28,383	55
8	Jackson CountyGEOID 18071	510 mi²	3.9 mi²	0.8%	47,370	93
9	White CountyGEOID 18181	505.2 mi²	3.5 mi²	0.7%	25,164	50
10	Montgomery CountyGEOID 18107	504.6 mi²	0.8 mi²	0.2%	38,954	77
11	Tippecanoe CountyGEOID 18157	498.9 mi²	4.3 mi²	0.9%	190,456	382
12	Lake CountyGEOID 18089	498.9 mi²	127.7 mi²	20.4%	504,612	1,011
13	Gibson CountyGEOID 18051	487.4 mi²	11.9 mi²	2.4%	33,091	68
14	Harrison CountyGEOID 18061	484.1 mi²	2 mi²	0.4%	40,437	84
15	Putnam CountyGEOID 18133	480.5 mi²	2.2 mi²	0.4%	37,876	79
16	Elkhart CountyGEOID 18039	463.2 mi²	4.8 mi²	1%	208,774	451
17	St. Joseph CountyGEOID 18141	457.8 mi²	3.6 mi²	0.8%	272,861	596
18	Randolph CountyGEOID 18135	452.4 mi²	0.9 mi²	0.2%	24,438	54
19	Madison CountyGEOID 18095	451.9 mi²	1 mi²	0.2%	135,088	299
20	Lawrence CountyGEOID 18093	449.1 mi²	2.8 mi²	0.6%	45,568	101
21	Sullivan CountyGEOID 18153	447.2 mi²	6.9 mi²	1.5%	20,831	47
22	Ripley CountyGEOID 18137	446.4 mi²	1.6 mi²	0.4%	29,434	66
23	Parke CountyGEOID 18121	444.7 mi²	5.3 mi²	1.2%	16,642	37
24	Marshall CountyGEOID 18099	443.6 mi²	6.1 mi²	1.4%	46,599	105
25	Pulaski CountyGEOID 18131	433.7 mi²	0.9 mi²	0.2%	12,463	29
26	Daviess CountyGEOID 18027	429.5 mi²	7.4 mi²	1.7%	34,209	80
27	Dubois CountyGEOID 18037	427.3 mi²	8.1 mi²	1.9%	44,016	103
28	Boone CountyGEOID 18011	422.9 mi²	0.3 mi²	0.1%	80,689	191
29	Porter CountyGEOID 18127	418.1 mi²	103.7 mi²	19.9%	176,049	421
30	Grant CountyGEOID 18053	414.1 mi²	0.8 mi²	0.2%	66,524	161
31	Wabash CountyGEOID 18169	412.5 mi²	8.4 mi²	2%	30,713	74
32	Cass CountyGEOID 18017	412.1 mi²	2.7 mi²	0.7%	37,836	92
33	Shelby CountyGEOID 18145	411.1 mi²	1.6 mi²	0.4%	45,882	112
34	Noble CountyGEOID 18113	410.8 mi²	6.6 mi²	1.6%	47,937	117
35	Posey CountyGEOID 18129	409.4 mi²	10.2 mi²	2.4%	24,988	61
36	Rush CountyGEOID 18139	408.1 mi²	0.3 mi²	0.1%	16,767	41
37	Bartholomew CountyGEOID 18005	406.9 mi²	2.6 mi²	0.6%	85,729	211
38	Hendricks CountyGEOID 18063	406.9 mi²	1.9 mi²	0.5%	193,510	476
39	Benton CountyGEOID 18007	406.4 mi²	0.1 mi²	0%	8,883	22
40	Clinton CountyGEOID 18023	405.1 mi²	0.2 mi²	0%	33,322	82
41	Morgan CountyGEOID 18109	403.9 mi²	5.6 mi²	1.4%	74,967	186
42	Vigo CountyGEOID 18167	403.6 mi²	6.8 mi²	1.7%	106,512	264
43	Newton CountyGEOID 18111	401.8 mi²	1.7 mi²	0.4%	14,188	35
44	Wayne CountyGEOID 18177	401.8 mi²	2.6 mi²	0.6%	66,169	165
45	Orange CountyGEOID 18117	398.4 mi²	9.8 mi²	2.4%	19,834	50
46	Spencer CountyGEOID 18147	396.9 mi²	4.6 mi²	1.2%	20,061	51
47	Marion CountyGEOID 18097	396 mi²	7 mi²	1.7%	992,196	2,506
48	Fountain CountyGEOID 18045	395.7 mi²	2.2 mi²	0.6%	17,013	43
49	Monroe CountyGEOID 18105	394.5 mi²	16.8 mi²	4.1%	143,345	363
50	Hamilton CountyGEOID 18057	394.4 mi²	8.1 mi²	2%	387,036	981
51	Delaware CountyGEOID 18035	392.1 mi²	3.8 mi²	1%	113,106	288
52	Henry CountyGEOID 18065	391.9 mi²	3 mi²	0.7%	49,137	125
53	Owen CountyGEOID 18119	385.3 mi²	2.5 mi²	0.7%	21,886	57
54	Warrick CountyGEOID 18173	384.6 mi²	6.4 mi²	1.6%	66,803	174
55	Franklin CountyGEOID 18047	384.4 mi²	6.6 mi²	1.7%	23,286	61
56	Jay CountyGEOID 18075	383.9 mi²	0.2 mi²	0%	20,118	52
57	Huntington CountyGEOID 18069	382.6 mi²	5.1 mi²	1.3%	37,224	97
58	Perry CountyGEOID 18123	381.7 mi²	4.6 mi²	1.2%	19,389	51
59	LaGrange CountyGEOID 18087	379.6 mi²	7.1 mi²	1.8%	41,305	109
60	Jennings CountyGEOID 18079	376.6 mi²	1.7 mi²	0.5%	27,622	73
61	Miami CountyGEOID 18103	373.8 mi²	3.5 mi²	0.9%	34,487	92
62	Decatur CountyGEOID 18031	372.6 mi²	0.8 mi²	0.2%	26,576	71
63	Clark CountyGEOID 18019	372.5 mi²	4.1 mi²	1.1%	130,451	350
64	Carroll CountyGEOID 18015	372.2 mi²	2.8 mi²	0.7%	20,655	55
65	Fulton CountyGEOID 18049	368.4 mi²	2.9 mi²	0.8%	20,091	55
66	Wells CountyGEOID 18179	368.1 mi²	2.2 mi²	0.6%	28,883	78
67	Warren CountyGEOID 18171	364.7 mi²	1.7 mi²	0.5%	8,474	23
68	DeKalb CountyGEOID 18033	362.8 mi²	1 mi²	0.3%	44,535	123
69	Jefferson CountyGEOID 18077	360.7 mi²	2.3 mi²	0.6%	33,279	92
70	Clay CountyGEOID 18021	357.6 mi²	2.7 mi²	0.8%	26,410	74
71	Adams CountyGEOID 18001	338.9 mi²	1 mi²	0.3%	36,650	108
72	Martin CountyGEOID 18101	335.8 mi²	4.6 mi²	1.4%	9,856	29
73	Whitley CountyGEOID 18183	335.6 mi²	2.3 mi²	0.7%	35,046	104
74	Pike CountyGEOID 18125	334.4 mi²	6.7 mi²	2%	12,003	36
75	Johnson CountyGEOID 18081	320.4 mi²	1.4 mi²	0.4%	174,262	544
76	Brown CountyGEOID 18013	312 mi²	4.6 mi²	1.5%	15,777	51
77	Starke CountyGEOID 18149	309.1 mi²	3.1 mi²	1%	23,425	76
78	Steuben CountyGEOID 18151	308.8 mi²	13.7 mi²	4.2%	34,799	113
79	Hancock CountyGEOID 18059	306 mi²	1.1 mi²	0.3%	90,969	297
80	Crawford CountyGEOID 18025	305.6 mi²	3.2 mi²	1%	10,509	34
81	Dearborn CountyGEOID 18029	305.1 mi²	2.3 mi²	0.8%	51,609	169
82	Howard CountyGEOID 18067	293.1 mi²	0.8 mi²	0.3%	83,904	286
83	Tipton CountyGEOID 18159	260.5 mi²	0 mi²	0%	15,319	59
84	Vermillion CountyGEOID 18165	256.9 mi²	3 mi²	1.2%	15,488	60
85	Vanderburgh CountyGEOID 18163	233.4 mi²	3.5 mi²	1.5%	181,995	780
86	Switzerland CountyGEOID 18155	220.7 mi²	2.9 mi²	1.3%	10,037	45
87	Fayette CountyGEOID 18041	215 mi²	0.1 mi²	0.1%	23,533	109
88	Scott CountyGEOID 18143	190.4 mi²	2.3 mi²	1.2%	25,053	132
89	Blackford CountyGEOID 18009	165.1 mi²	0.5 mi²	0.3%	11,730	71
90	Union CountyGEOID 18161	161.2 mi²	4 mi²	2.4%	6,863	43
91	Floyd CountyGEOID 18043	148.5 mi²	1 mi²	0.7%	82,153	553
92	Ohio CountyGEOID 18115	86.2 mi²	1.3 mi²	1.5%	5,994	70

County / equivalent

Land

Water

Water share

Population

Per mi²

Allen CountyGEOID 18003

657.1 mi²

2.8 mi²

0.4%

402,329

612

LaPorte CountyGEOID 18091

598.3 mi²

15 mi²

2.4%

111,294

186

Jasper CountyGEOID 18073

559.7 mi²

1.7 mi²

0.3%

33,894

Greene CountyGEOID 18055

542.5 mi²

3.4 mi²

0.6%

31,165

Kosciusko CountyGEOID 18085

531.4 mi²

22.9 mi²

4.1%

80,892

152

Knox CountyGEOID 18083

515.8 mi²

8.1 mi²

1.5%

35,652

Washington CountyGEOID 18175

513.7 mi²

2.9 mi²

0.6%

28,383

Jackson CountyGEOID 18071

510 mi²

3.9 mi²

0.8%

47,370

White CountyGEOID 18181

505.2 mi²

3.5 mi²

0.7%

25,164

Montgomery CountyGEOID 18107

504.6 mi²

0.8 mi²

0.2%

38,954

Tippecanoe CountyGEOID 18157

498.9 mi²

4.3 mi²

0.9%

190,456

382

Lake CountyGEOID 18089

498.9 mi²

127.7 mi²

20.4%

504,612

1,011

Gibson CountyGEOID 18051

487.4 mi²

11.9 mi²

2.4%

33,091

Harrison CountyGEOID 18061

484.1 mi²

2 mi²

0.4%

40,437

Putnam CountyGEOID 18133

480.5 mi²

2.2 mi²

0.4%

37,876

Elkhart CountyGEOID 18039

463.2 mi²

4.8 mi²

208,774

451

St. Joseph CountyGEOID 18141

457.8 mi²

3.6 mi²

0.8%

272,861

596

Randolph CountyGEOID 18135

452.4 mi²

0.9 mi²

0.2%

24,438

Madison CountyGEOID 18095

451.9 mi²

1 mi²

0.2%

135,088

299

Lawrence CountyGEOID 18093

449.1 mi²

2.8 mi²

0.6%

45,568

101

Sullivan CountyGEOID 18153

447.2 mi²

6.9 mi²

1.5%

20,831

Ripley CountyGEOID 18137

446.4 mi²

1.6 mi²

0.4%

29,434

Parke CountyGEOID 18121

444.7 mi²

5.3 mi²

1.2%

16,642

Marshall CountyGEOID 18099

443.6 mi²

6.1 mi²

1.4%

46,599

105

Pulaski CountyGEOID 18131

433.7 mi²

0.9 mi²

0.2%

12,463

Daviess CountyGEOID 18027

429.5 mi²

7.4 mi²

1.7%

34,209

Dubois CountyGEOID 18037

427.3 mi²

8.1 mi²

1.9%

44,016

103

Boone CountyGEOID 18011

422.9 mi²

0.3 mi²

0.1%

80,689

191

Porter CountyGEOID 18127

418.1 mi²

103.7 mi²

19.9%

176,049

421

Grant CountyGEOID 18053

414.1 mi²

0.8 mi²

0.2%

66,524

161

Wabash CountyGEOID 18169

412.5 mi²

8.4 mi²

30,713

Cass CountyGEOID 18017

412.1 mi²

2.7 mi²

0.7%

37,836

Shelby CountyGEOID 18145

411.1 mi²

1.6 mi²

0.4%

45,882

112

Noble CountyGEOID 18113

410.8 mi²

6.6 mi²

1.6%

47,937

117

Posey CountyGEOID 18129

409.4 mi²

10.2 mi²

2.4%

24,988

Rush CountyGEOID 18139

408.1 mi²

0.3 mi²

0.1%

16,767

Bartholomew CountyGEOID 18005

406.9 mi²

2.6 mi²

0.6%

85,729

211

Hendricks CountyGEOID 18063

406.9 mi²

1.9 mi²

0.5%

193,510

476

Benton CountyGEOID 18007

406.4 mi²

0.1 mi²

8,883

Clinton CountyGEOID 18023

405.1 mi²

0.2 mi²

33,322

Morgan CountyGEOID 18109

403.9 mi²

5.6 mi²

1.4%

74,967

186

Vigo CountyGEOID 18167

403.6 mi²

6.8 mi²

1.7%

106,512

264

Newton CountyGEOID 18111

401.8 mi²

1.7 mi²

0.4%

14,188

Wayne CountyGEOID 18177

401.8 mi²

2.6 mi²

0.6%

66,169

165

Orange CountyGEOID 18117

398.4 mi²

9.8 mi²

2.4%

19,834

Spencer CountyGEOID 18147

396.9 mi²

4.6 mi²

1.2%

20,061

Marion CountyGEOID 18097

396 mi²

7 mi²

1.7%

992,196

2,506

Fountain CountyGEOID 18045

395.7 mi²

2.2 mi²

0.6%

17,013

Monroe CountyGEOID 18105

394.5 mi²

16.8 mi²

4.1%

143,345

363

Hamilton CountyGEOID 18057

394.4 mi²

8.1 mi²

387,036

981

Delaware CountyGEOID 18035

392.1 mi²

3.8 mi²

113,106

288

Henry CountyGEOID 18065

391.9 mi²

3 mi²

0.7%

49,137

125

Owen CountyGEOID 18119

385.3 mi²

2.5 mi²

0.7%

21,886

Warrick CountyGEOID 18173

384.6 mi²

6.4 mi²

1.6%

66,803

174

Franklin CountyGEOID 18047

384.4 mi²

6.6 mi²

1.7%

23,286

Jay CountyGEOID 18075

383.9 mi²

0.2 mi²

20,118

Huntington CountyGEOID 18069

382.6 mi²

5.1 mi²

1.3%

37,224

Perry CountyGEOID 18123

381.7 mi²

4.6 mi²

1.2%

19,389

LaGrange CountyGEOID 18087

379.6 mi²

7.1 mi²

1.8%

41,305

109

Jennings CountyGEOID 18079

376.6 mi²

1.7 mi²

0.5%

27,622

Miami CountyGEOID 18103

373.8 mi²

3.5 mi²

0.9%

34,487

Decatur CountyGEOID 18031

372.6 mi²

0.8 mi²

0.2%

26,576

Clark CountyGEOID 18019

372.5 mi²

4.1 mi²

1.1%

130,451

350

Carroll CountyGEOID 18015

372.2 mi²

2.8 mi²

0.7%

20,655

Fulton CountyGEOID 18049

368.4 mi²

2.9 mi²

0.8%

20,091

Wells CountyGEOID 18179

368.1 mi²

2.2 mi²

0.6%

28,883

Warren CountyGEOID 18171

364.7 mi²

1.7 mi²

0.5%

8,474

DeKalb CountyGEOID 18033

362.8 mi²

1 mi²

0.3%

44,535

123

Jefferson CountyGEOID 18077

360.7 mi²

2.3 mi²

0.6%

33,279

Clay CountyGEOID 18021

357.6 mi²

2.7 mi²

0.8%

26,410

Adams CountyGEOID 18001

338.9 mi²

1 mi²

0.3%

36,650

108

Martin CountyGEOID 18101

335.8 mi²

4.6 mi²

1.4%

9,856

Whitley CountyGEOID 18183

335.6 mi²

2.3 mi²

0.7%

35,046

104

Pike CountyGEOID 18125

334.4 mi²

6.7 mi²

12,003

Johnson CountyGEOID 18081

320.4 mi²

1.4 mi²

0.4%

174,262

544

Brown CountyGEOID 18013

312 mi²

4.6 mi²

1.5%

15,777

Starke CountyGEOID 18149

309.1 mi²

3.1 mi²

23,425

Steuben CountyGEOID 18151

308.8 mi²

13.7 mi²

4.2%

34,799

113

Hancock CountyGEOID 18059

306 mi²

1.1 mi²

0.3%

90,969

297

Crawford CountyGEOID 18025

305.6 mi²

3.2 mi²

10,509

Dearborn CountyGEOID 18029

305.1 mi²

2.3 mi²

0.8%

51,609

169

Howard CountyGEOID 18067

293.1 mi²

0.8 mi²

0.3%

83,904

286

Tipton CountyGEOID 18159

260.5 mi²

0 mi²

15,319

Vermillion CountyGEOID 18165

256.9 mi²

3 mi²

1.2%

15,488

Vanderburgh CountyGEOID 18163

233.4 mi²

3.5 mi²

1.5%

181,995

780

Switzerland CountyGEOID 18155

220.7 mi²

2.9 mi²

1.3%

10,037

Fayette CountyGEOID 18041

215 mi²

0.1 mi²

0.1%

23,533

109

Scott CountyGEOID 18143

190.4 mi²

2.3 mi²

1.2%

25,053

132

Blackford CountyGEOID 18009

165.1 mi²

0.5 mi²

0.3%

11,730

Union CountyGEOID 18161

161.2 mi²

4 mi²

2.4%

6,863

Floyd CountyGEOID 18043

148.5 mi²

1 mi²

0.7%

82,153

553

Ohio CountyGEOID 18115

86.2 mi²

1.3 mi²

1.5%

5,994

Indiana counties by area

Understanding Indiana’s county areas

Where water changes the picture

Where people live

Complete area table