Town Hall Address 628 Rt. 94 Columbia, NJ 07832 United States- Warren County Website http://knowlton-nj.com/ County Clerk 908-496-4816 Ext. 6 Monday - Friday: 8:00 A.M. - 4:00 P.M. 628 Rt. 94 Columbia, NJ 07832 United States Assessor 908-496-4816 Ext. 5 Wednesday: 4:30 P.M. - 8:00 P.M. 628 Rt. 94 Columbia, NJ 07832 United States Tax Collector 908-496-4816 Ext. 4 Tuesday & Friday: 6:00 P.M. - 9:00 P.M. 628 Rt. 94 Columbia, NJ 07832 United States Attorney 908-735-5161 628 Rt. 94 Columbia, NJ 07832 United States Mayor 908-496-4816 628 Rt. 94 Columbia, NJ 07832 United States Municipal Court 908-496-4131 628 Rt. 94 Columbia, NJ 07832 United States Town Hall Hours Monday - Friday 8:00AM - 4:00PM County Warren