There are 2 Post Offices in Clayton, California, serving a population of 11,838 people in an area of 4 square miles. There is 1 Post Office per 5,919 people, and 1 Post Office per 1 square miles.
In California, Clayton is ranked 669th of 1798 cities in Post Offices per capita, and 455th of 1798 cities in Post Offices per square mile.
Find addresses, phone numbers, fax numbers, hours & services for Clayton Post Offices.
Clayton Post Office 1028 Diablo Street Clayton, CA
United States Postal Service 6150 Center Street Clayton, CA Mailing Service, Postal Services