A letter, being circulated locally, is asking Texarkana, Ark., residents to submit $50 to have their address numbers painted on the street curbs adjacent to their houses—ostensibly to help law enforcement agencies.

But police say the letter is a scam.

The Texarkana, Ark., Police Department was recently contacted about a letter circulating in the Woodline housing addition north of Interstate 30.

The letter asks residents to have the house numbers painted on the curb to help law enforcement agencies locate addresses, said Officer Kristi Mitchell, TAPD spokesma...