Postage stamps and postal history of the Canal Zone

Postage stamps and postal history of the Canal Zone is a subject that covers the postal system, postage stamps used and mail sent to and from the Panama Canal Zone from 1904 up until October 1978, after the United States relinquished its authority of the Zone in compliance with the treaty it reached with Panama. The Canal Zone was a strip of territory 50 miles (80 km) long and 10 miles (16 km) wide across the Isthmus of Panama, and was ceded to the United States for the purpose of constructing and operating the canal which connected the Atlantic and Pacific Oceans.

Source: Wikipedia — Postage stamps and postal history of the Canal Zone (CC BY-SA 4.0)