If there is one thing you need to know about voting on Election Day, it’s this: Do NOT mail your ballot.

The state is not allowing votes to be counted that have a Nov. 3 postmark. Monday was the cutoff for postmarked ballots. You missed it.

If there is a second thing you need to know, it’s this: If you are not registered to vote yet, you can still participate.

For everyone who has waited until Tuesday to cast your ballot, here are your remaining options:

Put it in a drop box

Ballots will be collected by county clerk employees and counted right up until polls close at 8 p.m.

There are 21 of these drop boxes in Salt Lake County, 21 in Weber County, 19 in Utah County, 15 in Davis County, seven in Summit County and four in Tooele County.

Refer to your county clerk for addresses, or a list of drop boxes statewide can be found at vote.utah.gov.

Deliver it to a voting center

In Salt Lake County, walk your completed by-mail ballot into a voting center — you don’t have to wait in line, but bring ID. Salt Lake County has 59 of them listed on the county clerk’s website, which is slco.org/clerk.

Vote in person

Again, there are 59 Salt Lake County voting centers. If you misplaced your mail ballot or haven’t yet registered to vote, you can do that at a voting center. Remember to bring that ID.

Weber County and Davis County each have just one voting assistance center, where you may get a replacement ballot or register to vote. They are at the Weber County Fair Grounds in Ogden and the Legacy Events Center in Farmington.

Use the drive-thru

Utah County has no in-person Election Day voting, but it does have eight locations where you can register, pick up a new ballot, fill it out and put it into a drop box. Bring ID and proof of residence.

Summit County has a drive-thru center at the Summit County Fairgrounds in Coalville, and Tooele County has one at the Deseret Peak Complex.