Running for office in Rock Island County, Illinois.

The short version.

A plain-language guide to how county ballot access works in every one of Illinois's 102 counties. Almost every route onto the November 3, 2026 ballot has already closed: the general primary was held March 17, 2026, independent and new-party petitions were due June 22, 2026, and the window for a party to fill an office nobody ran for closed 75 days after the primary. One route is still open. A declared write-in candidacy costs nothing, needs no signatures, and can be filed up to Thursday, September 3, 2026. Click the map or use the list.

Illinois has 102 counties and 108 election authorities. The Illinois Constitution requires every county to elect a Sheriff, a County Clerk and a County Treasurer, and all three of those are on the 2026 ballot in all 102 counties. Six cities run their own Board of Election Commissioners separately from the county clerk, and Peoria County is run by a county election commission rather than by its clerk, so the office that handles your paperwork depends on where in the county you live.

This page covers that for Rock Island County and points you at your local election office for anything specific to your county. It is not legal advice; the official rules live with your election office and the Illinois State Board of Elections.

Rock Island County by the numbers.

Illinois election calendar (2026).

Illinois runs one statewide election calendar for every county. The dates below are set by the Illinois Election Code and cover the 2026 cycle. Every date has been checked against the statute text rather than against a summary or a candidate handbook.

• Tue Mar 17, 2026General primary election. Already held. This is the date the remaining deadlines are measured from, and a candidate who ran in this primary and lost cannot come back as a write-in or as another party's candidate at the general election.
• Sun May 31, 2026Deadline for an established party to fill a county office no one ran for, by committee designation plus full petition signatures. Already closed. 10 ILCS 5/7-61 measures this as 75 days AFTER the general primary, not before the general election.
• Mon Jun 15 - Mon Jun 22, 2026Filing window for independent candidates and new political parties, 141 to 134 days before the general election. Already closed.
• Thu Sep 3, 2026, 5 p.m.STILL OPEN. Last day to file a notarized declaration of intent to be a write-in candidate, 61 days before the election. No fee, no signatures. This is the only route left onto the November ballot for most county offices.
• Mon Oct 19, 2026After this point a vacancy in nomination cannot be filled at all, and the original certified name stays on the ballot.
• Tue Oct 27, 2026Narrow fallback. If an objection to another candidate's papers is sustained after September 3, a write-in declaration for that office may still be filed up to 7 days before the election.
• Tue Nov 3, 2026General election.

These dates come from the Illinois Election Code and apply statewide. Which seats actually appear on your county's ballot, and which county board seats are up this year, varies county by county. Confirm with the election authority listed on this page before you rely on any of it.

Offices on the ballot in Rock Island County.

Illinois splits its county offices across two four-year cycles. 2026 is the gubernatorial year, and that decides which offices are on the ballot.

• Sheriff. A 4-year term. On the ballot in Rock Island County this year, and in all 102 Illinois counties, because the Illinois Constitution requires every county to elect one.
• County Clerk. A 4-year term, and in most Illinois counties the office that runs elections and takes nominating papers.
• County Treasurer. A 4-year term. The third of the three offices no Illinois county may abolish.
• County Board seats. Some Rock Island County board seats are on the ballot at every general election. Which ones are up in 2026 was decided by lot after the last reapportionment, so ask the office below for the seat-by-seat list.
• Regional Superintendent of Schools, where the office has not been abolished and where your county is not part of a multi-county educational service region.

Statewide and legislative seats covering Rock Island County are on the same ballot:

• Governor and Lieutenant Governor, who run together as a single ticket.
• Attorney General, Secretary of State, Comptroller and Treasurer, each elected statewide to a 4-year term.
• United States Senator. Illinois's Class 2 Senate seat is on the 2026 ballot and the incumbent is not seeking re-election, so it is an open seat.
• United States Representative. All 17 Illinois congressional seats are elected every 2 years.
• State Representative. All 118 Illinois House seats are elected every 2 years.
• State Senator. Illinois's 59 Senate districts run on staggered terms, so only some districts are on the ballot in any given year. Check whether yours is one of them.
• Judicial vacancies and retention questions, which vary by judicial circuit rather than by county.

Two things vary and neither can be worked out from the statute. First, Illinois county boards divide their seats into 2-year and 4-year groups by lot after each reapportionment, so which board seats are up in 2026 is a fact about your county, not a rule. Second, 85 Illinois counties are organized under township government with a county board, while 17 are commission counties whose three commissioners serve 6-year terms with one seat up at each general election. Ask your election authority for the seat-by-seat list rather than assuming.

How to get on the ballot.

Illinois offers four routes onto a county ballot. Three of them closed earlier in 2026. The fourth is open until September 3.

Write-in candidacy. Open until 5 p.m. Thursday, September 3, 2026.

This is the live route, and for most Illinois county offices it is the only one left. 10 ILCS 5/18-9.1 provides that write-in votes are counted only for people who have filed a notarized declaration of intent with the proper election authority no later than 61 days before the election. Sixty-one days before November 3, 2026 is Thursday, September 3, 2026.

Established party primary. Closed since November 2025.

Candidates seeking a major party's nomination for county office filed nominating petitions in November 2025 and ran in the March 17, 2026 general primary. For a county-wide office outside Cook County the petition requirement is 0.5% of the votes cast by that party's qualified electors in the county at the last general election. Illinois charges no filing fee for county office. Petitions may not be circulated more than 90 days before the filing deadline.

Independent candidate petition. Closed June 22, 2026.

Independent candidates file nominating papers with the county clerk not more than 141 and not less than 134 days before the general election, which for 2026 was June 15 to June 22. The signature requirement is a band rather than a fixed number: not less than 5% and not more than 8% of the votes cast at the last regular election in that district, or the minimum plus 50, whichever is greater. That is ten to sixteen times the party requirement, which is why the write-in route matters so much once this window shuts.

Vacancy in nomination. Closed May 31, 2026 for the case that matters most.

Where no established party candidate appeared on the primary ballot for an office and nobody won it as a primary write-in, the party's committee may designate someone, but only if that person files full petition signatures within 75 days after the general primary. That is the trap in this statute: the clock runs forward from the March 17 primary, not backward from the November election, so it expired on May 31, 2026. A separate and narrower route stays alive all autumn, but only reactively. If a certified nominee dies or declines, the vacancy must be filled within 8 days of the event, and a vacancy arising 15 days or less before the election cannot be filled at all.

Statutory references: Illinois charges no filing fee for county office. Ballot access is by petition signatures, and a declared write-in candidacy costs nothing at all. · 10 ILCS 5/18-9.1 and 10 ILCS 5/17-16.1. Write-in votes count only where a notarized declaration of intent was filed with the election authority not later than 61 days before the election. · 10 ILCS 5/7-61. Where no party candidate was on the primary ballot, a designated replacement must file full petitions within 75 days after the general primary. · 10 ILCS 5/10-3 and 10 ILCS 5/10-6. Signatures of 5% to 8% of the last regular election vote, filed not more than 141 nor less than 134 days before the election. · 10 ILCS 5/7-10(c). County-wide offices outside Cook County require 0.5% of the party's qualified electors who voted at the last general election. · 10 ILCS 5/2A-16, 2A-17 and 2A-19 put County Clerk, Sheriff and County Treasurer on the 1978 cycle, which lands on 2026. 10 ILCS 5/2A-13, 2A-14, 2A-15, 2A-18 and 2A-21 put Recorder, Auditor, Circuit Clerk, Coroner and State's Attorney on the 1980 cycle, which lands on 2028. · Illinois Constitution article VII section 4(c). Every county must elect a sheriff, county clerk and treasurer. Every other county office is optional and can be created or eliminated by county-wide referendum. · 10 ILCS 5/4-8. The election authority furnishes voter registration data to local political committees at the cost of duplication plus 15% for administration, on a sworn affidavit that it will be used only for bona fide political purposes, including by or for candidates for office. Using that data for commercial solicitation or other business purposes is a Class 4 felony.. Fees and signature counts change; confirm before you file.

The Rock Island County Clerk.

This is the office that runs elections where you live. In 101 Illinois counties that is the county clerk; in Peoria County it is a county election commission. Nominating papers for a county office go to the county clerk, but a write-in declaration goes to the election authority, and in the six counties containing a city board of election commissioners that means two filings rather than one.

Contact details verified 2026-08-15. Official statewide sources: Illinois State Board of Elections · Illinois State Board of Elections: candidate information and forms · Illinois Election Code, 10 ILCS 5 · 10 ILCS 5/18-9.1, the write-in declaration deadline · 10 ILCS 5/7-61, filling a vacancy in nomination.

Common questions.

After you qualify: the field operation.

Illinois county races are decided by a small, findable set of households. Turnout in a gubernatorial year runs well below a presidential year, and a declared write-in campaign starting in September has roughly eight weeks to reach voters and explain an unfamiliar thing: how to write a name in and where. That is a persuasion problem and a mechanics problem at once, and it rewards knowing exactly which doors are worth knocking rather than walking a whole precinct.

That is the part Motion51 was built for. You scope your district, cut turf, and send volunteers out with a phone instead of a clipboard. It works offline, so canvassing does not stop where the cell signal does, and every door is logged with a timestamp for your records. Our For Candidates page walks through what that looks like.

Counties next to Rock Island.

Running in a district that crosses a county line? Each of these has its own guide.

See all Illinois counties →