The Triangle Post Office was established in 1818. The first postmaster of Triangle was Gaius L. Spencer. The Triangle Post Office ceased operation in 1954, with service provided by the Greene Post Office in Chenango County.
Triangle NY/July 9 Manuscript town and date; Manuscript "Paid 18 3/4" to Hamilton, UC via Queenston Exchange Office where black DCDS of Queenston was applied, "Paid 18 3/4" was crossed out and manuscript "4 1/2" added and 4 1/2 pence was collected on arrival. 18 3/4 cents paid the rate for 150 - 400 miles, per Act of March 3, 1825.
Triangle N.Y./Jany 21st Manuscript; Manuscript 12 1/2. Rate for 80 - 150 miles, per Act of April 9, 1816.
Triangle/Mar 15 Manuscript; Manuscript 12 overwritten 18 3/4. Rate for 150 - 400 miles, per Act of March 3, 1825.
Triangle N.Y./Dec 25 Manuscript town and date; manuscript "5". Unusual mailing on Christmas day. Rate for under 300 miles, per Act of March 3, 1845.
TRIANGLE/N.Y./MAY/21 Black triangle shaped; Black "3"; Black 14 x 4mm S/L PAID. Rate for up to 3000 miles, per Act of March 3, 1851.
TRIANGLE/SEP/14/N.Y. CDS 32mm Black, Fancy black PAID/3 in 22mm Circle. Rate for up to 3000 miles, per Act of March 3, 1851.
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