Handling the duties of the postal service at King's Cliffe were the 590th. Army Postal Unit. The Unit arrived at King's Cliffe in January, 1944 and quickly set up a complete post office which remained in service until July, 1945.

In one year the Unit handled over 40,000 sacks of mail without without a single instance of delay. Each day two trips were made to the railhead aprox. 12 miles away, no matter the weather conditions to load and unload such mail.