About Our Town

Allenstown is a town located in Merrimack County, New Hampshire, United States. This town was granted in 1721 but was not incorporated until 1831 and takes its name from 17th century provincial governor Samuel Allen. The land originally belonging to the heirs of Governor Samuel Allen was named Allenstown in honor of the Governor’s memory. Settlers to this area built lumber mills and gristmills alongside the Little Mill Brook while others tilled acres of soil in an attempt to grow produce and raise livestock. With enough people living in town, Allenstown was finally incorporated in 1831.

The railroad did not route through Allenstown proper, so over the years the population shifted toward the western side of town. The eastern side of Allenstown became part of Bear Brook State Park. Allenstown is bounded by Pembroke and the Suncook River to the north, Epsom and Deerfield to the east, Candia and Hooksett to the south, and the Merrimack River and Bow to the west. Allenstown includes a portion of the Suncook village. 

According to the US Census Bureau, the town has a total area of 20.4 square miles, of which 20.3 square miles is land and 0.1 square miles is water, comprising 0.54% of the town. The highest point in Allenstown is Bear Hill, at 835 feet (255 m) above sea level. Allenstown lies fully within the Merrimack River watershed. Bear Brook State Park occupies 6,740 acres in the center of town, extending from the town's northern corner to its southern corner. (An additional 3,200 acres (13 km2) of the park are in the neighboring towns of Deerfield, Candia and Hooksett. 
As of the 2010 census, there were 4,322 people. The median age of the residents was 39.6 years of age. The racial makeup of the town was 95.8% white and 4.2% other races. There were 1,756 households with the average household size being 2.45 people. The median income of the town is $55,752. Of the 3,243 residents 25 years of age and older, 33.8% were a high school graduate, 8.5%, 12.7% and 3.1% respectively had an associates degree, bachelor’s degree, or advanced degree. Of the population 16 year or older (3,792), 93.6 were employed. The mean travel time to work for residents is 30 minutes. 

Interesting Stats at a Glance:


Total 20.4 sq mi (52.9 km2)
Land 20.3 sq mi (52.6 km2)
Water 0.1 sq mi (0.3 km2)  0.54%
Elevation 340 ft (104 m)

Population (2010) Total 4,322
Density 210/sq mi (82/km2)
Time Zone Eastern (UTC-5)
Summer (DST)
Eastern (UTC-4)

ZIP code 03275
Area code(s) 603
FIPS code 33-00660
GNIS feature ID 0873528