The Piglio post office was subordinate to the Anagni first class distribution office. In 1871, Piglio had a population of 2,931.
Piglio, March 1865, 2 bajocchi black on greenish white 1852, pays the reduced 2 bajocchi rate effective January 1, 1864. Anagni transit marking on front. Roma Ceprano Ambulanza March 12, and Roma indistinct date arrival marking on back.