In Iowa, 49% of 18-year-olds are registered to vote, compared to 80% of voters 45+
Teens have the power to close the gap.
Learn MoreIowa Voter Registration Gap
This maps shows the most recent county-level voter registration rates in Iowa, one of a set of 39 states we currently track. Rates are shown for both 18-year-olds and adults ages 45 and older. Click a county to learn more about voter registration in there.
Iowa
49% of 18-year-olds are registered to vote as of Aug 10, 2026.
Learn more about this information.
High school communities can close the gap in Iowa.
Student-led, non-partisan voter registration drives in school ensure every student has the chance to get ready to vote before they graduate.
Iowa County Registration Rates
This table shows the voter registration rates in each Iowa county or county-equivalent as of Aug 10, 2026. We omit counties with 18-year-old populations below 100.
See our methods for more details.
| 18 vs 45+ | |||||
|---|---|---|---|---|---|
| Allamakee County | > 90% | 79% | 128 | 14,092 | |
| Appanoose County | 63% | 78% | 136 | 12,184 | |
| Benton County | 65% | 82% | 285 | 25,724 | |
| Black Hawk County | 28% | 77% | 2,334 | 131,049 | |
| Boone County | > 90% | 81% | 230 | 26,668 | |
| Bremer County | 49% | 86% | 509 | 25,204 | |
| Buchanan County | 80% | 80% | 225 | 20,694 | |
| Buena Vista County | 41% | 63% | 299 | 20,753 | |
| Butler County | > 90% | 80% | 133 | 14,268 | |
| Carroll County | > 90% | 84% | 204 | 20,594 | |
| Cass County | 88% | 78% | 125 | 13,096 | |
| Cedar County | 56% | 83% | 202 | 18,349 | |
| Cerro Gordo County | 64% | 77% | 460 | 42,632 | |
| Cherokee County | 65% | 79% | 124 | 11,600 | |
| Chickasaw County | 79% | 78% | 139 | 11,807 | |
| Clarke County | 34% | 69% | 151 | 9,662 | |
| Clay County | > 90% | 80% | 117 | 16,461 | |
| Clayton County | 90% | 80% | 164 | 17,013 | |
| Clinton County | 70% | 76% | 504 | 46,268 | |
| Crawford County | 43% | 64% | 181 | 16,277 | |
| Dallas County | 89% | > 90% | 1,014 | 107,968 | |
| Davis County | 48% | 73% | 101 | 9,157 | |
| Decatur County | 25% | 74% | 209 | 7,759 | |
| Delaware County | 86% | 85% | 186 | 17,558 | |
| Des Moines County | 67% | 75% | 410 | 38,487 | |
| Dubuque County | 57% | 81% | 1,457 | 99,030 | |
| Emmet County | 30% | 74% | 252 | 9,262 | |
| Fayette County | 53% | 73% | 266 | 19,288 | |
| Floyd County | 60% | 77% | 181 | 15,328 | |
| Franklin County | 56% | 71% | 147 | 9,956 | |
| Grundy County | > 90% | 84% | 126 | 12,384 | |
| Guthrie County | > 90% | 82% | 102 | 10,688 | |
| Hamilton County | 76% | 76% | 130 | 14,886 | |
| Hardin County | 53% | 71% | 217 | 16,639 | |
| Harrison County | 36% | 81% | 148 | 14,632 | |
| Henry County | 47% | 73% | 281 | 20,004 | |
| Humboldt County | 67% | 79% | 106 | 9,591 | |
| Iowa County | 85% | 85% | 157 | 16,507 | |
| Jackson County | 74% | 80% | 174 | 19,390 | |
| Jasper County | 62% | 78% | 442 | 37,954 | |
| Jefferson County | 63% | 81% | 157 | 15,705 | |
| Johnson County | 22% | 87% | 4,450 | 156,639 | |
| Jones County | 72% | 77% | 219 | 20,896 | |
| Kossuth County | 78% | 83% | 137 | 14,516 | |
| Lee County | 57% | 71% | 293 | 32,893 | |
| Linn County | 57% | 82% | 2,856 | 230,004 | |
| Louisa County | > 90% | 73% | 118 | 10,678 | |
| Lyon County | > 90% | 87% | 149 | 12,162 | |
| Madison County | 75% | 88% | 199 | 16,926 | |
| Mahaska County | 53% | 77% | 340 | 22,021 | |
| Marion County | 69% | 86% | 553 | 33,642 | |
| Marshall County | 60% | 68% | 526 | 40,114 | |
| Mills County | > 90% | 85% | 115 | 14,568 | |
| Muscatine County | 59% | 71% | 523 | 42,559 | |
| O'Brien County | 81% | 82% | 135 | 14,126 | |
| Page County | > 90% | 72% | 108 | 15,131 | |
| Palo Alto County | 56% | 84% | 114 | 8,863 | |
| Plymouth County | 90% | 83% | 244 | 25,747 | |
| Polk County | 56% | 80% | 6,003 | 503,175 | |
| Pottawattamie County | 41% | 75% | 1,354 | 93,424 | |
| Poweshiek County | 26% | 77% | 516 | 18,545 | |
| Scott County | 62% | 81% | 2,121 | 174,608 | |
| Shelby County | 58% | 81% | 163 | 11,778 | |
| Sioux County | 50% | 83% | 796 | 36,212 | |
| Story County | 12% | 86% | 5,344 | 100,466 | |
| Tama County | 29% | 76% | 185 | 16,868 | |
| Union County | 60% | 76% | 184 | 11,993 | |
| Wapello County | 38% | 64% | 468 | 35,362 | |
| Warren County | 76% | > 90% | 768 | 54,409 | |
| Washington County | 66% | 78% | 231 | 22,561 | |
| Webster County | 28% | 72% | 764 | 36,886 | |
| Winnebago County | 65% | 81% | 160 | 10,583 | |
| Winneshiek County | 33% | 86% | 474 | 19,873 | |
| Woodbury County | 42% | 67% | 1,621 | 106,247 | |
| Wright County | 67% | 74% | 126 | 12,791 |
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About this information
The voter data shown on this page comes from a commercial source that compiles official state records and was last updated on Sep 8, 2026. Population estimates come from the American Community Survey. To learn more, read our research model.
These pages are offered for guidance only and are not intended as legal advice. Please consult state election officials or an attorney if you have questions about any particular situation. We hope you find this useful. To cite our resources and original research, please provide links and/or cite The Civics Center.
If you have a question or noticed a discrepancy, please contact us.
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