Boulder County voters electing to mail in ballots this election might come up 1 cent short on postage.

Voter instructions for returning ballots say the cost of postage for county residents who received two-sheet ballots in the secrecy sleeve will cost 69 cents — the 49 cents for a stamp plus the cost of an additional ounce. However, in January the U.S. Postal Service raised the cost of an additional ounce to 21 cents, meaning postage for a two-sheet ballot and secrecy sleeve would actually cost 70 cents.

Voters should rest assured their ballots will be delivered with no problem however, Boulder County Clerk and Recorder’s Office spokeswoman Mircalla Wozniak said in an email Monday.

The Clerk and Recorder’s Office has confirmed with the postmaster that ballots mailed with 69 cents postage will make it to the office.

Voters also have the option of forgoing postage altogether by returning their ballots at any one of three 24-hour ballot drop boxes or any voting service and polling center in the county, Wozniak said. Locations of the drop boxes and polling centers are included in mail ballot packets and online at BoulderCountyVotes.org.

Last fall, 102,209 mail-in ballots were returned but because this is the first general election with universal mail-in balloting, the office does not have an estimate of how many mail-in ballots to expect by Election Day, Wozniak said.

As of Monday morning, the Boulder County Clerk and Recorder’s Office has received 4,149 ballots.