The Papal enclave of Pontecorvo was a 2nd class distribution office, reporting to Frosinone. In 1871, Pontecorvo had a population of 10,812.
Pontecorvo, September 1, 1833, rated 3 bajocchi to Rome. Frosinone straightline transit marking on front, and 5 Settembre transit datestamp of Frosinone on back.
Pontecorvo, May 21, 1860, 1 bajocco black on blue green 1852 pays the rate for a single letter within the same direzione postale. Frosinone May 23, 1860 arrival marking.