Zip Code 48060 Description. Zip Code 48060 is located in the state of Michigan in the Detroit metro area. Zip code 48060 is primarily located in Saint Clair County. The official US Postal Service name for 48060 is PORT HURON, Michigan. Portions of zip code 48060 are contained within or border the city limits of Port Huron, MI, Marysville, MI, . The area code for zip code 48060 is 810.