Postcard of the Saginaw post office. The detail is amazing. Construction started on the Saginaw Post Office on May 11, 1897 and dedication ceremonies took place on July 4, 1898. Originally established as EAST SAGINAW on September 15, 1851 the name changed to SAGINAW EAST SIDE on March 17, 1892. Then the name changed to SAGINAW on June 24, 1898. In the 1970's the county acquired the post office and rehabilitated it as the Castle Museum, and is owned and operated by the Historical Society of Saginaw County. It was listed in the National Register of Historic Places in 1987. It is worth seeing if you are ever in the area.