The Colorado Secretary of State’s Office, which oversees elections in the state, urged voters to drop off their ballots rather than mailing them after Oct. 29, according to a news release from the office.

That's because postmarks don't count — ballots must be in the hands of an election official by 7 p.m. on Election Day, Nov. 6, the release said.

“I have worked very hard to provide funding for our county clerks to set up 24-hour drop boxes so voters can drop off their ballots any time of the day or night,” said Wayne Williams, secretary of state, in the release.

Voters can use a voting center operated by their county clerk or a 24-hour drop box, and those options don’t require stamps, the release said. To find a voting center or drop box near you, use the state's voting information tool.

The Voter Service and Polling Centers in each county will be open through Election Day, except for on Sunday, Nov. 4, the release said. All voters who vote in person must provide identification: Check out the Secretary of State’s Office’s guidelines for acceptable forms of ID.

Oct. 29 is also the last day for voters to request a ballot and have it mailed to them — starting Oct. 30, those voters must go to a voter center and vote in person, the release said.