Ochopee, Florida, Post Office, Smallest in U.S. Poster

"Ochopee, Florida, Post Office, Smallest in the United States" by Catherine Sherman. "Ochopee, Florida, Post Office, Smallest Post Office in the United States" by Catherine Sherman. The closet-sized, 7x8-foot building used to be an irrigation pipe shed for a tomato farm. It was pressed into service after a fire in 1952 destroyed the Ochopee general store, which previously had housed the post office. The fully functional post office is in Big Cypress National Preserve, near the intersection of US 41 and State Road 29. The zip code is 34141-9998. Visitors can get a special postmark for mail posted there. The mailman who delivers mail from this post office has a daily route that stretches across three counties, 132 miles long.