Town Hall Address 400 Witherspoon St. Princeton, NJ 08540 United States- Mercer County Website http://www.princetonnj.gov County Clerk 609-924-5704 Monday - Friday: 9:00 A.M. - 5:00 P.M. 400 Witherspoon St. Princeton, NJ 08540 United States County Admin 609-924-5176 Princeton, NJ 08540 United States Assessor 609-924-1084 400 Witherspoon St. Princeton, NJ 08540 United States Attorney 609-924-1084 400 Witherspoon St. Princeton, NJ 08540 United States Mayor 609-924-5176 400 Witherspoon St. Princeton, NJ 08540 United States Municipal Court 609-924-5042 400 Witherspoon St. Princeton, NJ 08540 United States County Mercer