If you want your Valentine's be sent through the Sweetheart City, you just need to follow these instructions. Be sure to respect the deadlines!!
Loveland's Valentine Re-Mailing Program began in January 1947. Ted Thompson received about thirty valentines from people requesting to have the cards postmarked from Loveland for "a romantic extra touch". He and the postmaster Elmer Ivers thought it could be an opportunity to advertise Loveland, and the Loveland Chamber of Commerce agreed to collaborate. Thompson designed a cachet who was used twice. Then he started the tradition of changing it every year. Since then, one different cachet with a verse has been used every year. For 2014 it will be:
You can read all the details of the program here.