Town Hall Address 156 Bank St. Highstown, NJ 08520-3291 United States- Mercer County Website http://www.highstownborough.com County Clerk 609-490-5100 Ext. 772 Monday - Friday: 8:30 A.M. - 4:30 P.M. 156 Bank St. Highstown, NJ 08520-3291 United States Assessor 609-490-5100 Ext. 669 Wednesday: 5:00 P.M. - 7:00 P.M. 156 Bank St. Highstown, NJ 08520-3291 United States Tax Collector 609-490-5100 Ext. 613 156 Bank St. Highstown, NJ 08520-3291 United States County Mercer