In Iowa, 47% of 18-year-olds are registered to vote, compared to 79% 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 31 states we currently track, with more states coming soon. 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
47% of 18-year-olds are registered to vote as of Apr 6, 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 Apr 6, 2026. We omit counties with populations below 10,000.
See our methods for more details.
| 18 vs 45+ | |||||
|---|---|---|---|---|---|
| Allamakee County | > 90% | 79% | 128 | 14,092 | |
| Appanoose County | 65% | 77% | 136 | 12,184 | |
| Benton County | 66% | 82% | 285 | 25,724 | |
| Black Hawk County | 27% | 76% | 2,334 | 131,049 | |
| Boone County | > 90% | 81% | 230 | 26,668 | |
| Bremer County | 49% | 86% | 509 | 25,204 | |
| Buchanan County | 80% | 79% | 225 | 20,694 | |
| Buena Vista County | 36% | 63% | 299 | 20,753 | |
| Butler County | > 90% | 80% | 133 | 14,268 | |
| Carroll County | > 90% | 84% | 204 | 20,594 | |
| Cass County | > 90% | 78% | 125 | 13,096 | |
| Cedar County | 52% | 83% | 202 | 18,349 | |
| Cerro Gordo County | 60% | 78% | 460 | 42,632 | |
| Cherokee County | 70% | 78% | 124 | 11,600 | |
| Chickasaw County | 68% | 78% | 139 | 11,807 | |
| Clay County | > 90% | 79% | 117 | 16,461 | |
| Clayton County | 82% | 80% | 164 | 17,013 | |
| Clinton County | 71% | 76% | 504 | 46,268 | |
| Crawford County | 39% | 64% | 181 | 16,277 | |
| Dallas County | 80% | > 90% | 1,014 | 107,968 | |
| Delaware County | 85% | 84% | 186 | 17,558 | |
| Des Moines County | 56% | 75% | 410 | 38,487 | |
| Dickinson County | > 90% | 86% | 85 | 17,990 | |
| Dubuque County | 56% | 81% | 1,457 | 99,030 | |
| Fayette County | 48% | 73% | 266 | 19,288 | |
| Floyd County | 51% | 78% | 181 | 15,328 | |
| Grundy County | > 90% | 84% | 126 | 12,384 | |
| Guthrie County | 79% | 82% | 102 | 10,688 | |
| Hamilton County | 80% | 76% | 130 | 14,886 | |
| Hancock County | > 90% | 79% | 90 | 10,671 | |
| Hardin County | 53% | 71% | 217 | 16,639 | |
| Harrison County | 35% | 80% | 148 | 14,632 | |
| Henry County | 45% | 72% | 281 | 20,004 | |
| Iowa County | 88% | 85% | 157 | 16,507 | |
| Jackson County | 78% | 80% | 174 | 19,390 | |
| Jasper County | 57% | 77% | 442 | 37,954 | |
| Jefferson County | 61% | 80% | 157 | 15,705 | |
| Johnson County | 21% | 87% | 4,450 | 156,639 | |
| Jones County | 75% | 76% | 219 | 20,896 | |
| Kossuth County | > 90% | 83% | 137 | 14,516 | |
| Lee County | 53% | 72% | 293 | 32,893 | |
| Linn County | 55% | 82% | 2,856 | 230,004 | |
| Louisa County | 80% | 73% | 118 | 10,678 | |
| Lyon County | > 90% | 87% | 149 | 12,162 | |
| Madison County | 74% | 88% | 199 | 16,926 | |
| Mahaska County | 58% | 77% | 340 | 22,021 | |
| Marion County | 63% | 86% | 553 | 33,642 | |
| Marshall County | 58% | 68% | 526 | 40,114 | |
| Mills County | > 90% | 85% | 115 | 14,568 | |
| Mitchell County | 49% | 80% | 90 | 10,575 | |
| Montgomery County | 18% | 71% | 87 | 10,214 | |
| Muscatine County | 57% | 71% | 523 | 42,559 | |
| O'Brien County | 77% | 82% | 135 | 14,126 | |
| Page County | > 90% | 71% | 108 | 15,131 | |
| Plymouth County | > 90% | 83% | 244 | 25,747 | |
| Polk County | 49% | 80% | 6,003 | 503,175 | |
| Pottawattamie County | 41% | 75% | 1,354 | 93,424 | |
| Poweshiek County | 26% | 76% | 516 | 18,545 | |
| Scott County | 58% | 80% | 2,121 | 174,608 | |
| Shelby County | 68% | 81% | 163 | 11,778 | |
| Sioux County | 50% | 83% | 796 | 36,212 | |
| Story County | 13% | 85% | 5,344 | 100,466 | |
| Tama County | 24% | 75% | 185 | 16,868 | |
| Union County | 62% | 76% | 184 | 11,993 | |
| Wapello County | 34% | 64% | 468 | 35,362 | |
| Warren County | 69% | > 90% | 768 | 54,409 | |
| Washington County | 57% | 78% | 231 | 22,561 | |
| Webster County | 40% | 72% | 764 | 36,886 | |
| Winnebago County | 56% | 80% | 160 | 10,583 | |
| Winneshiek County | 35% | 86% | 474 | 19,873 | |
| Woodbury County | 40% | 67% | 1,621 | 106,247 | |
| Wright County | 61% | 73% | 126 | 12,791 |
Your Donations Fuel Our Mission
Your gift powers non-partisan preregistration drives in communities across the country. Every donation builds momentum, funds local efforts, and helps more young people get ready to vote. Support us today — and spread the word!
The Civics Center is a project of Community Partners, a 501(c)(3) organization.
Partner
with Us
We partner with school districts and nonpartisan organizations serving high school students and educators;
Are you passionate about democracy and helping young people thrive?
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 Jun 9, 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.
© 2026 The Civics Center
