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) is an unincorporated community in Madison County, Iowa, United States. Its elevation is 1,122 feet (342 m), and it is located at (41.2358251, -93.9452255). Although Old Peru is unincorporated, it once had a post office under the name of Peru; the office was established on 18 April 1853 and closed on 14 September 1903. Even though the community's post office has been closed for over a century, ZIP Code 50222 is still reserved for Peru.