IN · 2026 Census Gazetteer

Indiana counties by area

Official, comparable measurements for 92 counties and county equivalents.

Source fields preservedGEOID · ALAND · AWATER

County equivalents92

Combined land35,825.2 mi²

Combined water596.1 mi²

Largest by landAllen County

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.

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.

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.

Complete area table

Sorted from largest to smallest land area.

#	County / equivalent	Land	Water	Water share
1	Allen CountyGEOID 18003	657.1 mi²	2.8 mi²	0.4%
2	LaPorte CountyGEOID 18091	598.3 mi²	15 mi²	2.4%
3	Jasper CountyGEOID 18073	559.7 mi²	1.7 mi²	0.3%
4	Greene CountyGEOID 18055	542.5 mi²	3.4 mi²	0.6%
5	Kosciusko CountyGEOID 18085	531.4 mi²	22.9 mi²	4.1%
6	Knox CountyGEOID 18083	515.8 mi²	8.1 mi²	1.5%
7	Washington CountyGEOID 18175	513.7 mi²	2.9 mi²	0.6%
8	Jackson CountyGEOID 18071	510 mi²	3.9 mi²	0.8%
9	White CountyGEOID 18181	505.2 mi²	3.5 mi²	0.7%
10	Montgomery CountyGEOID 18107	504.6 mi²	0.8 mi²	0.2%
11	Tippecanoe CountyGEOID 18157	498.9 mi²	4.3 mi²	0.9%
12	Lake CountyGEOID 18089	498.9 mi²	127.7 mi²	20.4%
13	Gibson CountyGEOID 18051	487.4 mi²	11.9 mi²	2.4%
14	Harrison CountyGEOID 18061	484.1 mi²	2 mi²	0.4%
15	Putnam CountyGEOID 18133	480.5 mi²	2.2 mi²	0.4%
16	Elkhart CountyGEOID 18039	463.2 mi²	4.8 mi²	1%
17	St. Joseph CountyGEOID 18141	457.8 mi²	3.6 mi²	0.8%
18	Randolph CountyGEOID 18135	452.4 mi²	0.9 mi²	0.2%
19	Madison CountyGEOID 18095	451.9 mi²	1 mi²	0.2%
20	Lawrence CountyGEOID 18093	449.1 mi²	2.8 mi²	0.6%
21	Sullivan CountyGEOID 18153	447.2 mi²	6.9 mi²	1.5%
22	Ripley CountyGEOID 18137	446.4 mi²	1.6 mi²	0.4%
23	Parke CountyGEOID 18121	444.7 mi²	5.3 mi²	1.2%
24	Marshall CountyGEOID 18099	443.6 mi²	6.1 mi²	1.4%
25	Pulaski CountyGEOID 18131	433.7 mi²	0.9 mi²	0.2%
26	Daviess CountyGEOID 18027	429.5 mi²	7.4 mi²	1.7%
27	Dubois CountyGEOID 18037	427.3 mi²	8.1 mi²	1.9%
28	Boone CountyGEOID 18011	422.9 mi²	0.3 mi²	0.1%
29	Porter CountyGEOID 18127	418.1 mi²	103.7 mi²	19.9%
30	Grant CountyGEOID 18053	414.1 mi²	0.8 mi²	0.2%
31	Wabash CountyGEOID 18169	412.5 mi²	8.4 mi²	2%
32	Cass CountyGEOID 18017	412.1 mi²	2.7 mi²	0.7%
33	Shelby CountyGEOID 18145	411.1 mi²	1.6 mi²	0.4%
34	Noble CountyGEOID 18113	410.8 mi²	6.6 mi²	1.6%
35	Posey CountyGEOID 18129	409.4 mi²	10.2 mi²	2.4%
36	Rush CountyGEOID 18139	408.1 mi²	0.3 mi²	0.1%
37	Bartholomew CountyGEOID 18005	406.9 mi²	2.6 mi²	0.6%
38	Hendricks CountyGEOID 18063	406.9 mi²	1.9 mi²	0.5%
39	Benton CountyGEOID 18007	406.4 mi²	0.1 mi²	0%
40	Clinton CountyGEOID 18023	405.1 mi²	0.2 mi²	0%
41	Morgan CountyGEOID 18109	403.9 mi²	5.6 mi²	1.4%
42	Vigo CountyGEOID 18167	403.6 mi²	6.8 mi²	1.7%
43	Newton CountyGEOID 18111	401.8 mi²	1.7 mi²	0.4%
44	Wayne CountyGEOID 18177	401.8 mi²	2.6 mi²	0.6%
45	Orange CountyGEOID 18117	398.4 mi²	9.8 mi²	2.4%
46	Spencer CountyGEOID 18147	396.9 mi²	4.6 mi²	1.2%
47	Marion CountyGEOID 18097	396 mi²	7 mi²	1.7%
48	Fountain CountyGEOID 18045	395.7 mi²	2.2 mi²	0.6%
49	Monroe CountyGEOID 18105	394.5 mi²	16.8 mi²	4.1%
50	Hamilton CountyGEOID 18057	394.4 mi²	8.1 mi²	2%
51	Delaware CountyGEOID 18035	392.1 mi²	3.8 mi²	1%
52	Henry CountyGEOID 18065	391.9 mi²	3 mi²	0.7%
53	Owen CountyGEOID 18119	385.3 mi²	2.5 mi²	0.7%
54	Warrick CountyGEOID 18173	384.6 mi²	6.4 mi²	1.6%
55	Franklin CountyGEOID 18047	384.4 mi²	6.6 mi²	1.7%
56	Jay CountyGEOID 18075	383.9 mi²	0.2 mi²	0%
57	Huntington CountyGEOID 18069	382.6 mi²	5.1 mi²	1.3%
58	Perry CountyGEOID 18123	381.7 mi²	4.6 mi²	1.2%
59	LaGrange CountyGEOID 18087	379.6 mi²	7.1 mi²	1.8%
60	Jennings CountyGEOID 18079	376.6 mi²	1.7 mi²	0.5%
61	Miami CountyGEOID 18103	373.8 mi²	3.5 mi²	0.9%
62	Decatur CountyGEOID 18031	372.6 mi²	0.8 mi²	0.2%
63	Clark CountyGEOID 18019	372.5 mi²	4.1 mi²	1.1%
64	Carroll CountyGEOID 18015	372.2 mi²	2.8 mi²	0.7%
65	Fulton CountyGEOID 18049	368.4 mi²	2.9 mi²	0.8%
66	Wells CountyGEOID 18179	368.1 mi²	2.2 mi²	0.6%
67	Warren CountyGEOID 18171	364.7 mi²	1.7 mi²	0.5%
68	DeKalb CountyGEOID 18033	362.8 mi²	1 mi²	0.3%
69	Jefferson CountyGEOID 18077	360.7 mi²	2.3 mi²	0.6%
70	Clay CountyGEOID 18021	357.6 mi²	2.7 mi²	0.8%
71	Adams CountyGEOID 18001	338.9 mi²	1 mi²	0.3%
72	Martin CountyGEOID 18101	335.8 mi²	4.6 mi²	1.4%
73	Whitley CountyGEOID 18183	335.6 mi²	2.3 mi²	0.7%
74	Pike CountyGEOID 18125	334.4 mi²	6.7 mi²	2%
75	Johnson CountyGEOID 18081	320.4 mi²	1.4 mi²	0.4%
76	Brown CountyGEOID 18013	312 mi²	4.6 mi²	1.5%
77	Starke CountyGEOID 18149	309.1 mi²	3.1 mi²	1%
78	Steuben CountyGEOID 18151	308.8 mi²	13.7 mi²	4.2%
79	Hancock CountyGEOID 18059	306 mi²	1.1 mi²	0.3%
80	Crawford CountyGEOID 18025	305.6 mi²	3.2 mi²	1%
81	Dearborn CountyGEOID 18029	305.1 mi²	2.3 mi²	0.8%
82	Howard CountyGEOID 18067	293.1 mi²	0.8 mi²	0.3%
83	Tipton CountyGEOID 18159	260.5 mi²	0 mi²	0%
84	Vermillion CountyGEOID 18165	256.9 mi²	3 mi²	1.2%
85	Vanderburgh CountyGEOID 18163	233.4 mi²	3.5 mi²	1.5%
86	Switzerland CountyGEOID 18155	220.7 mi²	2.9 mi²	1.3%
87	Fayette CountyGEOID 18041	215 mi²	0.1 mi²	0.1%
88	Scott CountyGEOID 18143	190.4 mi²	2.3 mi²	1.2%
89	Blackford CountyGEOID 18009	165.1 mi²	0.5 mi²	0.3%
90	Union CountyGEOID 18161	161.2 mi²	4 mi²	2.4%
91	Floyd CountyGEOID 18043	148.5 mi²	1 mi²	0.7%
92	Ohio CountyGEOID 18115	86.2 mi²	1.3 mi²	1.5%

How to read this table. Land and water areas are Census statistical measurements in square miles. Adding county rows can differ slightly from separately published state totals because of rounding and geographic treatment.