Ally Bank hid the pennies in Chicago, New York City, Los Angeles, Washington, Miami, Denver, Detroit, San Diego, Charlotte, North Carolina and Austin, Texas, according to USA Today.
The "Lucky Penny" promotion began this week and the coins, if you find one, can be redeemed online until the end of the year. You can find clues and updates and redeem the coins at allyluckypenny.com.
The promotion is meant to drum up business for the bank and encourage people to save, the Associated Press said.
The fake pennies are copper-colored like real pennies, but feature the Detroit-based bank's logo instead of a picture of Abraham Lincoln, according to AP. The other side features the coin's value of 100,000 cents.
They're also slightly larger than real pennies, according to Ally.
Ally noted that about 10 billion pennies are minted each year, but nearly half go out of circulation, AP said. The lost or thrown away pennies result in millions of lost dollars every year.
"We believe every penny counts when it comes to saving and it's important for everyone to understand that routinely saving, even the smallest amounts, is important to generating wealth over time," said Diane Morais, president and CEO of Ally Bank.
