Peoria is an unincorporated community in Liberty Township, Union County, Ohio, United States. It is located along Raymond Road, about 1.75 mi south of Raymond and 6.5 mi northwest of Marysville. A post office was established in Peoria on September 26, 1872; it was closed on August 11, 1967. The mail service is now sent through the Columbus regional m…Peoria is an unincorporated community in Liberty Township, Union County, Ohio, United States. It is located along Raymond Road, about 1.75 mi south of Raymond and 6.5 mi northwest of Marysville. A post office was established in Peoria on September 26, 1872; it was closed on August 11, 1967. The mail service is now sent through the Columbus regional mail sorting facility, and distributed through the Marysville and Raymond local post offices.