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County by county results of the election. Blue counties were won by Kerry, red counties were won by Bush.
Iowa narrowly voted for Al Gore in 2000, but in 2004, the incumbent George W. Bush won with a 0.67% lead. Iowa is traditionally, a swing state—the Democrats had won Iowa in the last four elections, but narrowly in all of them, albeit of 1988.
Statewide winner in bold. See main article : U.S. presidential election, 2004.
| County |
John Kerry |
George Bush |
Other |
| Percentage |
Count |
Percentage |
Count |
Percentage |
Count |
| Adair |
43.1% |
1,844 |
56.1% |
2,402 |
0.7% |
32 |
| Adams |
42.0% |
977 |
56.6% |
1,317 |
1.3% |
31 |
| Allamakee |
48.8% |
3,449 |
50.0% |
3,530 |
1.2% |
83 |
| Appanoose |
47.5% |
3,063 |
51.8% |
3,340 |
0.7% |
47 |
| Audubon |
44.8% |
1,608 |
54.5% |
1,958 |
0.7% |
26 |
| Benton |
50.0% |
6,747 |
49.3% |
6,658 |
0.7% |
96 |
| Black Hawk |
55.4% |
35,392 |
43.9% |
28,046 |
0.7% |
469 |
| Boone |
50.2% |
7,027 |
49.0% |
6,870 |
0.8% |
112 |
| Bremer |
47.1% |
6,025 |
52.2% |
6,665 |
0.7% |
89 |
| Buchanan |
53.5% |
5,608 |
45.8% |
4,797 |
0.7% |
70 |
| Buena Vista |
41.5% |
3,520 |
57.6% |
4,887 |
1.0% |
83 |
| Butler |
40.1% |
3,001 |
59.1% |
4,417 |
0.8% |
57 |
| Calhoun |
40.5% |
2,243 |
58.7% |
3,255 |
0.8% |
44 |
| Carroll |
44.6% |
4,689 |
54.8% |
5,762 |
0.7% |
73 |
| Cass |
35.5% |
2,679 |
63.6% |
4,796 |
0.9% |
68 |
| Cedar |
49.0% |
4,747 |
50.2% |
4,869 |
0.8% |
78 |
| Cerro Gordo |
54.5% |
13,372 |
44.7% |
10,960 |
0.8% |
184 |
| Cherokee |
44.0% |
2,988 |
55.3% |
3,758 |
0.7% |
50 |
| Chickasaw |
54.5% |
3,708 |
44.7% |
3,040 |
0.9% |
58 |
| Clarke |
50.9% |
2,323 |
48.2% |
2,200 |
0.9% |
43 |
| Clay |
41.3% |
3,547 |
57.0% |
4,898 |
1.7% |
143 |
| Clayton |
51.7% |
4,736 |
47.0% |
4,312 |
1.3% |
120 |
| Clinton |
56.0% |
13,813 |
43.2% |
10,666 |
0.8% |
205 |
| Crawford |
44.5% |
3,220 |
54.6% |
3,955 |
0.9% |
67 |
| Dallas |
41.5% |
10,917 |
57.7% |
15,183 |
0.7% |
193 |
| Davis |
44.2% |
1,731 |
54.8% |
2,148 |
1.0% |
39 |
| Decatur |
46.3% |
1,859 |
52.1% |
2,088 |
1.6% |
64 |
| Delaware |
45.9% |
4,227 |
53.3% |
4,908 |
0.7% |
65 |
| Des Moines |
59.7% |
12,456 |
39.4% |
8,221 |
0.9% |
197 |
| Dickinson |
43.3% |
4,140 |
55.9% |
5,337 |
0.8% |
76 |
| Dubuque |
56.5% |
26,561 |
42.7% |
20,100 |
0.8% |
382 |
| Emmet |
46.6% |
2,405 |
52.3% |
2,697 |
1.0% |
54 |
| Fayette |
49.9% |
5,185 |
49.3% |
5,128 |
0.8% |
79 |
| Floyd |
53.3% |
4,349 |
45.9% |
3,745 |
0.9% |
73 |
| Franklin |
42.4% |
2,340 |
56.7% |
3,128 |
1.0% |
53 |
| Fremont |
38.6% |
1,510 |
60.4% |
2,362 |
1.0% |
39 |
| Greene |
48.1% |
2,459 |
51.2% |
2,618 |
0.7% |
36 |
| Grundy |
34.8% |
2,386 |
64.7% |
4,429 |
0.5% |
34 |
| Guthrie |
43.6% |
2,614 |
55.5% |
3,325 |
0.9% |
55 |
| Hamilton |
46.7% |
3,895 |
52.4% |
4,367 |
0.9% |
73 |
| Hancock |
42.1% |
2,484 |
57.0% |
3,368 |
0.9% |
53 |
| Hardin |
44.9% |
4,015 |
54.5% |
4,875 |
0.7% |
59 |
| Harrison |
37.8% |
2,906 |
60.9% |
4,680 |
1.2% |
94 |
| Henry |
43.6% |
4,127 |
55.2% |
5,220 |
1.2% |
110 |
| Howard |
55.7% |
2,614 |
43.2% |
2,028 |
1.2% |
55 |
| Humboldt |
40.1% |
2,146 |
59.1% |
3,162 |
0.8% |
42 |
| Ida |
37.5% |
1,415 |
62.1% |
2,342 |
0.5% |
17 |
| Iowa |
45.4% |
3,841 |
53.7% |
4,544 |
0.8% |
69 |
| Jackson |
56.5% |
5,656 |
42.4% |
4,242 |
1.1% |
113 |
| Jasper |
52.0% |
10,430 |
47.2% |
9,462 |
0.8% |
170 |
| Jefferson |
54.2% |
4,490 |
44.1% |
3,648 |
1.7% |
143 |
| Johnson |
64.0% |
41,847 |
34.7% |
22,715 |
1.2% |
811 |
| Jones |
50.7% |
5,054 |
48.4% |
4,834 |
0.9% |
90 |
| Keokuk |
41.9% |
2,294 |
56.9% |
3,119 |
1.2% |
67 |
| Kossuth |
44.6% |
4,132 |
54.5% |
5,042 |
0.9% |
84 |
| Lee |
56.8% |
10,152 |
41.8% |
7,472 |
1.3% |
234 |
| Linn |
54.6% |
60,442 |
44.6% |
49,442 |
0.8% |
856 |
| Louisa |
46.7% |
2,297 |
52.3% |
2,572 |
1.0% |
47 |
| Lucas |
43.5% |
1,987 |
55.6% |
2,543 |
0.9% |
41 |
| Lyon |
21.4% |
1,303 |
77.9% |
4,751 |
0.8% |
47 |
| Madison |
42.2% |
3,380 |
56.7% |
4,538 |
1.1% |
86 |
| Mahaska |
35.3% |
3,790 |
63.9% |
6,858 |
0.7% |
80 |
| Marion |
39.4% |
6,574 |
59.8% |
9,990 |
0.8% |
132 |
| Marshall |
49.3% |
9,443 |
49.9% |
9,557 |
0.9% |
164 |
| Mills |
33.3% |
2,308 |
65.6% |
4,556 |
1.1% |
76 |
| Mitchell |
50.8% |
2,785 |
48.3% |
2,646 |
0.9% |
49 |
| Monona |
47.8% |
2,397 |
51.3% |
2,575 |
0.9% |
46 |
| Monroe |
46.8% |
1,855 |
52.2% |
2,067 |
1.0% |
41 |
| Montgomery |
34.2% |
1,899 |
64.8% |
3,601 |
1.0% |
56 |
| Muscatine |
51.0% |
9,542 |
48.2% |
9,020 |
0.8% |
155 |
| O'Brien |
30.1% |
2,330 |
68.9% |
5,328 |
0.9% |
73 |
| Osceola |
28.6% |
934 |
70.3% |
2,295 |
1.1% |
37 |
| Page |
29.4% |
2,211 |
69.8% |
5,243 |
0.8% |
59 |
| Palo Alto |
47.8% |
2,482 |
51.5% |
2,674 |
0.7% |
35 |
| Plymouth |
35.0% |
4,278 |
63.9% |
7,810 |
1.1% |
134 |
| Pocahontas |
42.2% |
1,822 |
56.6% |
2,441 |
1.2% |
50 |
| Polk |
51.9% |
105,218 |
47.3% |
95,828 |
0.8% |
1,572 |
| Pottawattamie |
40.4% |
16,906 |
58.7% |
24,558 |
0.9% |
356 |
| Poweshiek |
50.0% |
5,043 |
49.2% |
4,965 |
0.8% |
83 |
| Ringgold |
46.3% |
1,286 |
52.8% |
1,466 |
0.9% |
26 |
| Sac |
41.2% |
2,215 |
58.2% |
3,128 |
0.6% |
31 |
| Scott |
50.9% |
42,122 |
48.3% |
39,958 |
0.8% |
642 |
| Shelby |
35.3% |
2,355 |
63.8% |
4,256 |
0.9% |
59 |
| Sioux |
13.6% |
2,259 |
85.9% |
14,229 |
0.5% |
82 |
| Story |
52.2% |
23,296 |
46.6% |
20,819 |
1.2% |
537 |
| Tama |
49.9% |
4,487 |
49.5% |
4,456 |
0.6% |
58 |
| Taylor |
39.2% |
1,252 |
59.8% |
1,908 |
0.9% |
30 |
| Union |
46.0% |
2,747 |
52.9% |
3,165 |
1.1% |
66 |
| Van Buren |
40.9% |
1,568 |
57.6% |
2,211 |
1.5% |
57 |
| Wapello |
54.6% |
9,125 |
44.3% |
7,403 |
1.1% |
179 |
| Warren |
46.5% |
10,730 |
52.7% |
12,160 |
0.7% |
163 |
| Washington |
43.0% |
4,595 |
55.9% |
5,977 |
1.1% |
116 |
| Wayne |
44.0% |
1,379 |
55.3% |
1,733 |
0.7% |
21 |
| Webster |
51.3% |
9,561 |
48.1% |
8,959 |
0.6% |
111 |
| Winnebago |
45.5% |
2,707 |
53.3% |
3,175 |
1.2% |
70 |
| Winneshiek |
49.6% |
5,354 |
49.4% |
5,324 |
1.0% |
106 |
| Woodbury |
48.5% |
21,455 |
50.8% |
22,451 |
0.7% |
289 |
| Worth |
55.4% |
2,286 |
43.5% |
1,795 |
1.0% |
42 |
| Wright |
44.4% |
2,930 |
55.0% |
3,631 |
0.6% |
42 |