image of a flag

​Primary Election & Voter Registration Information

View and File Campaign Reports

Voter Registration Information

Beginning June 20 and through Primary Election Day residents may visit any Adams County Voter Service and Polling Center Location (Voter Service) to register to vote, obtain a ballot if you do not already have one, or obtain a replacement ballot.

Service Locations are open Monday through Friday 8 a.m. to 5 p.m.; Saturday, June 25, 10 a.m. to 2 p.m.; and on Election Day, Tuesday, June 28 from 7:00 a.m. to 7:00 p.m. For more information about voter services, visit the Adams County web site at or call the City Clerk's office at 303-538-7230.   

Locations closest to Thornton are:

  • Adams County Western Services Center (ACED), 12200 N. Pecos Street in Westminster
  • Westminster Motor Vehicle, 8452 N. Federal Boulevard, Westminster
  • Commerce City Motor Vehicle, 7190 Colorado Boulevard in Commerce City

Primary Election 24-Hour Ballot Drop-Off Locations

The following Ballot Drop off locations in the City of Thornton are:

  • Anythink Library Wright Farms, 5877 E. 120th Avenue
  • Hilltop Village Shopping Center (by King Soopers), 13762 Colorado Boulevard
  • Margaret Carpenter Recreation Center, 11151 Colorado Boulevard
  • Thornton Civic Center, 9500 Civic Center Drive
  • Trail Winds Recreation Center, 13495 Holly Street

For a complete list of 24-Hour Ballot Drop Off locations for the June 28, Primary Election, visit the Adams County's web site at

Election Information

The Mayor and City Councilmembers are elected for four-year terms in Regular Municipal Elections, with one Councilmember elected from each ward every two years and the Mayor elected every four years (2023 and 2027). 

Regular Municipal Elections are held on the first Tuesday in November in odd-numbered years. Citizens will elect one Councilmember from each of the four Wards. A Mayor is elected every four years (2023 and 2027). The City Clerk’s office is responsible for conducting the Municipal Elections, as well as assisting Adams County with registering citizens to vote.

Want to request a service?
Want quick answers to common questions?

My Thornton