Zip Codes in Clayton County, Georgia. CLAYTON Zip Code (IA) The Zipcode for Clayton is . Zip code 94517 statistics: (Find on map) Estimated zip code population in 2016: 13,327 Zip code population in 2010: 12,385 Zip code population in 2000: 14,223 Mar. ZIP code 27527 has a small percentage of vacancies. What Time Zone is Clayton, Georgia. The majority of household are owned or have a mortgage. What Time Zone is Clayton, New Jersey. Clayton has 1 zip code and 1 area code which we have listed below. Select a particular Clayton ZIP Code to view a more detailed map and the number of Business, Residential, and PO Box addresses for that ZIP Code.The Residential addresses are segmented by both Single and Multi-family addessses. CLAYTON is a city in Contra Costa County, California, United States. Clayton is a borough of Gloucester, New Jersey in the Mid Atlantic region of the USA. 2016 cost of living index in zip code 94517: 139.4 (high, U.S. average is 100) Land area: 57.2 sq. What Time Zone is Clayton, Wisconsin. When mailing your package or letter, always include the preferred or acceptable cities. Clayton has 1 zip code and 1 area code which we have listed below. In the 2011 Australian census the population of Clayton was 15,543 when there were 7,463 Females and 8,080 Males living there with a median age of 26. As with most parts of the country, vehicles are the most common form of transportation to places of employment. Find MoreCities in Missouri that start with C, Post Office Address:130 S BEMISTON AVE STE 100, Post Office Suburb:SAINT LOUIS, MO, 63105-1913,