McHenry County, Illinois election authority: address and phone for 2026
The Illinois State Board of Elections lists McHenry County's election authority as the Clerk at 2200 North Seminary Avenue, Woodstock, IL 60098, phone 815-334-4242. For early voting, see every McHenry County early voting location with days and hours.
McHenry County election authority
Find your Election Day polling place with the State Board of Elections' Polling Place Locator.
Illinois voting dates for McHenry County voters
| Date | What |
|---|---|
| Thu, Sep 24 | Mail ballots start going out Election authorities can begin mailing ballots to voters who applied to vote by mail. source |
| Thu, Sep 24 | Early voting opens Sept 24 is the first day election offices can offer early voting. Some start later; Chicago began Oct 1. Hours vary by election office. source |
| Tue, Oct 6 | Last day to register by mail or at a registration site Regular registration closes Oct 6. After that, register online through Oct 18, or register and vote in person during early voting or on Election Day. source |
| Wed, Oct 7 | Same-day registration opens From October 7 through Election Day, you can register and vote at the same time at your election authority’s office or other locations it chooses. source |
| Sun, Oct 18 | Register online Online registration through the State Board of Elections closes Oct 18. source |
| Mon, Oct 19 | Early voting expands Permanent early voting sites open, including on weekends and holidays. Check your election authority for locations and hours. source |
| Thu, Oct 29 | Apply for a vote-by-mail ballot By mail or online, your election authority must receive your application by Oct 29. You can still apply in person at your election authority's office through Nov 2. source |
| Mon, Nov 2 | Early voting ends Last day of early voting. Hours vary by election office, so check yours before you go. source |
| Tue, Nov 3, 7:00 PM | Election Day: polls open 6:00 a.m. to 7:00 p.m. Look up your polling place by address with the State Board of Elections, or ask your county clerk or election commission. source |
| Tue, Nov 3, 7:00 PM | Register and vote the same day Grace-period registration runs Oct 7–Nov 3 at your election authority and designated sites; you must vote when you register. Polls close at 7 p.m. source |
| Tue, Nov 3 | Return your mail ballot It must be postmarked on or before Election Day and arrive by Nov 17 to be counted. Postmarks now show the day mail is processed, so mail it early or use an official drop box by 7 p.m. on Nov 3. source |
McHenry County voting questions
What is the phone number for the McHenry County election authority?
815-334-4242, the Clerk (McHenry County's election authority on the Illinois State Board of Elections, Election Authorities list).
What is the address of the McHenry County election authority?
2200 North Seminary Avenue, Woodstock, IL 60098.
When does early voting start in McHenry County?
Early voting opens Thursday, September 24; early voting ends Monday, November 2, 2026. Sept 24 is the first day election offices can offer early voting. Some start later; Chicago began Oct 1. Hours vary by election office. McHenry County's locations are on our McHenry County early voting page.
More for Illinois voters
- Who is on the Illinois ballot: every candidate on the state's official list, race by race.
- Illinois voting deadlines 2026: registration, mail ballots, early voting and Election Day.
- Illinois early voting locations we have read so far, with days and hours.
- Every Illinois county's office.
- Early voting dates in every state.
Other Illinois counties: Adams, Alexander, City of Bloomington, Bond, Boone, Brown, Bureau, Calhoun, Carroll, Cass, Champaign, City of Chicago, Christian, Clark, Clay, Clinton, Coles, Cook, Crawford, Cumberland, City of Danville, De Witt, DeKalb, Douglas, DuPage, City of East St. Louis, Edgar, Edwards, Effingham, Fayette, Ford, Franklin, Fulton, City of Galesburg, Gallatin, Greene, Grundy, Hamilton, Hancock, Hardin, Henderson, Henry, Iroquois, Jackson, Jasper, Jefferson, Jersey, Jo Daviess, Johnson, Kane, Kankakee, Kendall, Knox, Lake, LaSalle, Lawrence, Lee, Livingston, Logan, Macon, Macoupin, Madison, Marion, Marshall, Mason, Massac, McDonough, McLean, Menard, Mercer, Monroe, Montgomery, Morgan, Moultrie, Ogle, Peoria, Perry, Piatt, Pike, Pope, Pulaski, Putnam, Randolph, Richland, Rock Island, City of Rockford, Saline, Sangamon, Schuyler, Scott, Shelby, St. Clair, Stark, Stephenson, Tazewell, Union, Vermilion, Wabash, Warren, Washington, Wayne, White, Whiteside, Will, Williamson, Winnebago, Woodford.
Office details are from the Illinois State Board of Elections, Election Authorities (checked October 14, 2026). Dates are Illinois's, each linked to its source. Call the office before you go.