Idaho voter registration by party
Registered voters, total and by declared party, by county, from the Secretary of State's registration-totals archive.
Figures
Source: Idaho Secretary of State, Voter registration totals by county. Data period September 2026. Published .
| Measure | Value | Period |
|---|---|---|
| Registered votersSeptember 2026 | 1,030,522 | September 2026 |
Pages built on this dataset
Publisher
- Organization
- Idaho Secretary of State
- Publisher’s dataset
- Voter registration totals by county
- File or API used
- https://archive.voteidaho.gov/data/voter-registrations/202410_CountyTotals.csv
- Methodology
- https://voteidaho.gov/voter-registration/
Coverage
- Geography
- State and counties
- Time coverage
- 2012-2026
- Update frequency
- Monthly, most months
- Published
- September 2026
- Retrieved
- September 25, 2026
- License of the records
- Public domain. Idaho state government work.
- Rows
- 39,689 observations, 2012-2026
Measures
| Measure | What it measures | Unit |
|---|---|---|
| Registered voters | Total registered voters. | people |
| Registered voters by party | Registered voters by the party they are registered with. | people |
Caveats
- A registered voter is counted where they are currently registered, active or inactive; Idaho's registration total is not the same measure as its citizen voting-age population, and a county's count is not adjusted for voters who moved without updating their registration.
- Idaho does not require a party declaration to register; Unaffiliated was the largest single category through the mid-2010s and Republican the largest since, but neither is a residual or an error.
- Every month the source has published from January 2012 to the present is pulled, which is most, not all, months; this dataset's own puller lists the specific months it could not find a file for.
- The source's own registration-totals page states that a by-party breakdown is not available before December 2012; an earlier, party-less registration total exists but is out of scope for this by-party dataset and is not pulled.
- Registered voters, total, is the source's own published total column, not this site's sum of the five parties; a voter can register without declaring a party, so the parties do not add up to the total.
How to cite
Understand Idaho, “Voter registration totals by county”, compiled from Idaho Secretary of State, Voter registration totals by county. Retrieved September 25, 2026. https://understandidaho.com/data/idaho-sos-voter-registration/.
Cite Idaho Secretary of State directly for the figures themselves.
This page was last updated .