U.S. POSTAL SERVICE HOLIDAYS BY THE NUMBERS 232 Number of years the U.S. Postal Service has been delivering holiday cheer. 19 billion Number of cards, letters and packages to be delivered between Thanksgiving and Christmas. 3.4 billion Number of letters mailed over the holidays. 960 million Number of pieces of mail processed on Dec. 15, the busiest mailing day of the year. 700 million Average number of pieces of mail processed daily. 826 million Average number of pieces of mail processed daily during the holidays. 20 million In pounds, the amount of mail the Postal Service will process for overseas military installations, including war zones in Iraq and Afghanistan. 7,400 Number of Post Offices with expanded hours. 214,500 Number of vehicles used to transport holiday mail, including 188,336 half-ton trucks. 2.17 billion Number of holiday stamps the Postal Service printed this year. 130 million Number of customers who visit the Post Office during the holidays. Mail-by Dates Dec. 4 Military mail destined for Iraq or Afghanistan Dec. 11 Military mail to other international destinations Dec. 16 Parcel Post, the most economical service Dec. 20 First-Class Mail Dec. 20 Priority Mail Dec. 23 Express Mail