Town Hall Address 379 S. Branch Rd. Hillsborough, NJ 08844 United States- Somerset County Website http://www.hillsborough-nj.org County Clerk 908-369-4313 379 S. Branch Rd. Hillsborough, NJ 08844 United States Assessor 908-369-8077 379 S. Branch Rd. Hillsborough, NJ 08844 United States Tax Collector 908-369-8672 379 S. Branch Rd. Hillsborough, NJ 08844 United States Attorney 908-757-7800 379 S. Branch Rd. Hillsborough, NJ 08844 United States Mayor 908-369-4313 379 S. Branch Rd. Hillsborough, NJ 08844 United States Municipal Court 908-369-3532 379 S. Branch Rd. Hillsborough, NJ 08844 United States County Somerset