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Blank map of Iowa by county

All 99 counties of Iowa, ready to print on Letter, Tabloid, A4 or A3, or to download as PNG and SVG. Free, no sign-up.

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Mapsfera · data US Census Bureau

Iowa on the map

Iowa has 99 counties, the 9th most of any state. The largest is Kossuth, with 973 sq mi of land, and the smallest is Dickinson, with 381 sq mi: Kossuth is about 3 times bigger.

The state capital, Des Moines, is in Polk County, home to 99% of its residents; the city also reaches into Warren County. The capital version marks it on the map.

Polk County is the most populous, with 516,546 people in 2025, or 16% of the state. The least populous is Adams, with 3,617. Since 2020, Dallas has grown the fastest (+18.8%) and Henry has lost the most (−5.5%).

What each county borders

Webster borders the most counties in the state: 7 (Boone, Calhoun, Greene, Hamilton, Humboldt, Pocahontas, and Wright).

36 counties touch another state. 11 border Minnesota: Allamakee, Dickinson, Emmet, Howard, Kossuth, Lyon, Mitchell, Osceola and 3 more. 10 border Missouri: Appanoose, Davis, Decatur, Fremont, Lee, Page, Ringgold, Taylor and 2 more. 8 border Illinois: Clinton, Des Moines, Dubuque, Jackson, Lee, Louisa, Muscatine, and Scott. 6 border Nebraska: Fremont, Harrison, Mills, Monona, Pottawattamie, and Woodbury. 4 border South Dakota: Lyon, Plymouth, Sioux, and Woodbury. 3 border Wisconsin: Allamakee, Clayton, and Dubuque.

None has a coastline: Iowa is landlocked.

Number key

Numbers follow alphabetical order, from 1 (Adair) to 99 (Wright). Area is land area, without lakes or sea, and population is the Census estimate for July 1, 2025; “Borders” counts neighboring counties in the same state.

Show the whole table (99 rows)

No.	County	Land area	Population (2025)	Borders
1	Adair	569 sq mi	7,403	5
2	Adams	423 sq mi	3,617	5
3	Allamakee	639 sq mi	14,238	2
4	Appanoose	497 sq mi	12,077	3
5	Audubon	443 sq mi	5,509	4
6	Benton	716 sq mi	26,004	5
7	Black Hawk	566 sq mi	131,532	6
8	Boone	570 sq mi	26,799	6
9	Bremer	435 sq mi	25,296	4
10	Buchanan	571 sq mi	20,883	5
11	Buena Vista	575 sq mi	20,449	4
12	Butler	580 sq mi	14,049	5
13	Calhoun	570 sq mi	9,562	5
14	Carroll	569 sq mi	20,303	6
15	Cass	564 sq mi	12,960	6
16	Cedar	579 sq mi	18,359	6
17	Cerro Gordo	568 sq mi	42,372	5
18	Cherokee	577 sq mi	11,369	5
19	Chickasaw	504 sq mi	11,663	5
20	Clarke	431 sq mi	9,574	5
21	Clay	567 sq mi	16,202	4
22	Clayton	778 sq mi	16,845	4
23	Clinton	695 sq mi	46,002	4
24	Crawford	714 sq mi	16,237	6
25	Dallas	588 sq mi	118,457	5
26	Davis	502 sq mi	9,230	3
27	Decatur	532 sq mi	7,655	3
28	Delaware	578 sq mi	17,674	5
29	Des Moines	416 sq mi	38,077	3
30	Dickinson	381 sq mi	18,077	3
31	Dubuque	608 sq mi	99,381	4
32	Emmet	396 sq mi	9,107	3
33	Fayette	731 sq mi	19,047	5
34	Floyd	501 sq mi	14,901	4
35	Franklin	582 sq mi	9,868	4
36	Fremont	511 sq mi	6,522	2
37	Greene	570 sq mi	8,658	6
38	Grundy	502 sq mi	12,361	5
39	Guthrie	591 sq mi	10,782	5
40	Hamilton	577 sq mi	14,944	5
41	Hancock	571 sq mi	10,528	4
42	Hardin	569 sq mi	16,455	5
43	Harrison	697 sq mi	14,623	4
44	Henry	434 sq mi	19,349	6
45	Howard	473 sq mi	9,415	3
46	Humboldt	434 sq mi	9,409	4
47	Ida	432 sq mi	6,777	4
48	Iowa	586 sq mi	16,504	5
49	Jackson	636 sq mi	19,288	3
50	Jasper	730 sq mi	38,153	6
51	Jefferson	436 sq mi	15,291	5
52	Johnson	613 sq mi	160,044	6
53	Jones	576 sq mi	21,253	6
54	Keokuk	579 sq mi	9,797	6
55	Kossuth	973 sq mi	14,322	5
56	Lee	518 sq mi	32,306	3
57	Linn	717 sq mi	232,028	6
58	Louisa	402 sq mi	10,416	5
59	Lucas	431 sq mi	8,847	5
60	Lyon	588 sq mi	12,354	2
61	Madison	561 sq mi	17,270	5
62	Mahaska	571 sq mi	21,880	6
63	Marion	554 sq mi	34,192	6
64	Marshall	573 sq mi	39,890	5
65	Mills	437 sq mi	14,793	3
66	Mitchell	469 sq mi	10,650	4
67	Monona	694 sq mi	8,539	3
68	Monroe	434 sq mi	7,406	5
69	Montgomery	424 sq mi	10,002	5
70	Muscatine	437 sq mi	41,853	4
71	O'Brien	573 sq mi	14,220	4
72	Osceola	399 sq mi	5,980	3
73	Page	535 sq mi	14,856	3
74	Palo Alto	564 sq mi	8,899	4
75	Plymouth	863 sq mi	25,697	3
76	Pocahontas	577 sq mi	6,819	5
77	Polk	573 sq mi	516,546	6
78	Pottawattamie	951 sq mi	92,996	5
79	Poweshiek	585 sq mi	18,368	5
80	Ringgold	535 sq mi	4,642	3
81	Sac	575 sq mi	9,525	5
82	Scott	458 sq mi	175,259	3
83	Shelby	591 sq mi	11,689	5
84	Sioux	768 sq mi	36,774	3
85	Story	573 sq mi	101,291	6
86	Tama	721 sq mi	16,796	5
87	Taylor	532 sq mi	5,835	3
88	Union	424 sq mi	11,829	5
89	Van Buren	485 sq mi	7,131	4
90	Wapello	432 sq mi	35,210	5
91	Warren	570 sq mi	57,331	5
92	Washington	569 sq mi	22,667	6
93	Wayne	525 sq mi	6,738	3
94	Webster	716 sq mi	36,838	7
95	Winnebago	401 sq mi	10,251	3
96	Winneshiek	690 sq mi	19,733	4
97	Woodbury	873 sq mi	106,649	4
98	Worth	400 sq mi	7,338	3
99	Wright	580 sq mi	12,801	5

More blank maps

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Illinois 102 counties

South Dakota 66 counties

Missouri 114 counties and St. Louis City

US states 50 states

Frequently asked questions

How many counties does Iowa have?

99 counties. That’s the 9th most of any state.

What is the largest county in Iowa?

Kossuth, with 973 sq mi of land. The smallest is Dickinson, with 381 sq mi.

What is the most populous county in Iowa?

Polk County, with an estimated 516,546 people in 2025, or 16% of the state.

What county is Des Moines in?

The state capital, Des Moines, is in Polk County, home to 99% of its residents; the city also reaches into Warren County.

Can I use it in class?

Yes, it’s free. Print it, copy it and hand it out as many times as you like. If you post it on a blog or a class website, credit “Mapsfera · data US Census Bureau”.

How do I print it on US Letter paper?

Choose Letter in “Paper size” and click “Download PDF”. In the print window, pick Letter paper and 100% scale (“Actual size”). For a bigger map, choose Tabloid (11 × 17 in) or A3.

What order are the numbers in?

Alphabetical, from 1 to the last one. That makes the key easy to follow when you grade, and it’s the same key the worksheet’s answer page uses.

Sources

Boundaries: U.S. Census Bureau, Cartographic Boundary Files 2025, counties at 1:500,000 (public domain)
Land and water area: U.S. Census Bureau (TIGER/Line and 2025 Gazetteer); population: Vintage 2025 estimates (July 1, 2025)
State capital: Natural Earth, Populated Places (public domain); which counties it spans, Census places
Neighbors, coastline and borders: calculated from those boundaries (and checked against the Census county adjacency file)