Frosinone was a direzione postale, reporting directly to the Direzione Generale delle Poste Pontificio in Rome. In 1871, the population of Frosinone was 10,057.
Frosinone, 1812, letter to Chambery, France, sent during the French occupation (1808-1814) under Napoleon. Frosinone was an Arrondissement in the Departement of Tibre and used the 116 departement number of Rome.
Frosinone, printed circular dated October 8, 1828, from the Secretary General in Frosinone to Ceccano.
Stampless cover docketed October 1829, "Affrancata" with October 22 arrival datestamp on back.
Frosinone, unknown date prior to 1864, 1 bajocco black on blue green 1852 pays the rate for a single letter within the same direzione postale.
Frosinone, August 27, 1870, franked with rated 10 centesimi black on orange 1869 and 20 centesimi black on deep crimson 1868 paying the 10 centesimi letter rate within the Papal States, plus the 20 centesimi insurance (ASSICURATA) fee. Roma August 27, 1870 arrival marking on back.