High Quality Content by WIKIPEDIA articles! The U.S. Post Office for Yonkers, New York, is located on Main Street downtown, opposite the city`s train station. It is a two-story stone building erected in the late 1920s. It is located in the 10702 ZIP Code, but serves the entire city, which has other ZIP codes between 10701 and 10709. In 1989 it was listed on the National Register of Historic Places, along with many other historic post offices in the state.