Calendar Races Places Coverage How it works

Type a candidate, an officeholder, a city or county, or a state. Press / anywhere to open this.

Nonpartisan. We never endorse candidates or measures, and nothing here is ever conditioned on whether you vote. Dates come from official election offices; every figure links to its source.

For election officials Coverage How this works Editorial policy Privacy Terms Accessibility Partners Developers Contact

Lookup Calendar Races Mine

Elections in Jefferson County · Every Election

Places/CO/Jefferson County

County · CO

Elections in Jefferson County

Upcoming

No upcoming elections on file for this jurisdiction yet.

Held

NOV
03
2026
Sources disagree
Jefferson County General Election
On your ballot for: Jefferson County
Request mail ballot by
Monday, October 5, 2026
Register by
Monday, October 26, 2026
Mail ballot due
Monday, October 26, 2026
Election day
Tuesday, November 3, 2026
Polls
7am – 7pm on Nov 3

Is this one of yours?

Enter your address to see every jurisdiction you vote in and get reminders.

Find my elections

Add this jurisdiction to your calendar

Share how many elections happen here

Embed on your site

For newsrooms, libraries, and city or county websites. No key needed; options.

<div data-every-election="ocd-division/country%3Aus/state%3Aco/county%3Ajefferson" data-theme="auto"></div>
<script async src="https://everyelection.app/embed.js" data-api="https://api.everyelection.app" data-site="https://everyelection.app"></script>

Open data

JSON for CO · VIP feed

Elections in Jefferson County

Upcoming

Held

Jefferson County General Election