Polling centers opened across Colorado Monday morning to help voters do more than just send ballots off in the mail or leave them in drop boxes.

At voter service and polling centers, citizens can vote in-person, request a new or replacement ballot, register to vote, update their registration or simply drop-off a mail ballot and pick up an 'I voted' sticker.

Check out the 9NEWS Voter Guide

"The other thing that's been interesting to watch on social media right now are ballot selfies,” said Matt Crane, Arapahoe County Clerk and Recorder. “So if a voter comes in and wants to take a picture of themselves as they are voting, they can do that, so long as they are not holding up their entire ballot."

‘Ballot selfies’ are a misdemeanor in Colorado.

A Colorado lawmaker and voter filed a lawsuit in federal court Monday seeking to overturn a state law that bars people from taking photos of their ballots.

The suit was filed by Republican state Sen. Owen Hill of Colorado Springs, and Scott Romano of Littleton.

Deputy Secretary of State Suzanne Staiert said the law defends the integrity of elections and protects voters from intimidation or inducement.