Town Hall Address 15 Mountain Blvd. Watchung, NJ 07069 United States- Somerset County Website http://www.watchungnj.gov County Clerk 908-756-0080 Monday - Friday: 8:00 A.M. - 4:00 P.M. 15 Mountain Blvd. Watchung, NJ 07069 United States Assessor 908-756-3366 Ext. 224 Monday: 10:00 A.M. - 1:00 P.M. 15 Mountain Blvd. Watchung, NJ 07069 United States Tax Collector 908-756-8333 15 Mountain Blvd. Watchung, NJ 07069 United States Attorney 908-757-7800 15 Mountain Blvd. Watchung, NJ 07069 United States Mayor 908-756-0080 Ext. 222 15 Mountain Blvd. Watchung, NJ 07069 United States Municipal Court 908-769-2265 263 Somerset St. Plainfield, NJ 07070-4846 United States County Somerset