Town Hall Address 300 Route 10 South Grantham, NH 03753 United States- Sullivan County Website https://www.granthamnh.net/ Town Clerk (603) 863-5608 https://www.granthamnh.net/townclerk Mon 8am - 5 pm; Tue & Wed 8am - 7pm; Thu 8am - 12pm and 1pm - 5pm; Fri 8am - 12pm and 1pm - 4pm P.O. Box 135 Grantham, NH 03753 United States Tax Collector (603) 863-5608 Mon 8am - 5 pm; Tue & Wed 8am - 7pm; Thu 8am - 12pm and 1pm - 5pm; Fri 8am - 12pm and 1pm - 4pm P.O. Box 135 Grantham, NH 03753 United States Assessor (877) 337-5574 https://www.axisgis.com/GranthamNH/ 191 Merrimack St, Suite 701 Haverhill, MA 01830 United States Zoning (603) 863-6021 admin@granthamnh.net 300 Route 10 South Grantham, NH 03753 United States Fire District (603) 863-5710 P.O. Box 80 Grantham, NH 03753 United States Town Hall Hours Mon - Thu 8 A.M. - 5 P.M.; Fri 8 A.M. - 4 P.M. County Sullivan