Sullivan County, New Hampshire

Sullivan County population, land area and income

Sullivan County had 44,012 residents in the Census Vintage 2024 estimate, on 537.9 square miles of land. It ranks 9th of 10 in New Hampshire by population and 8th by land area. That works out to 81.8 people per square mile, near the US average of 96.3, and above the national county median.

The median county-equivalent in New Hampshire has 85,562 residents; Sullivan County is somewhat smaller.

Its SAIPE 2023 median household income of $74,730 is in the top quarter among 3,143 counties with an estimate.

How Sullivan County's population changed since 2020

Sullivan County gained 943 residents between the July 2020 and July 2024 estimates, a rise of 2.2%. That ranks 6th of 10 in New Hampshire for growth. The median New Hampshire county changed by +2.3%, and the state as a whole by +2.2%.

Since the April 2020 estimates base, Sullivan County recorded 1,505 births and 2,221 deaths, a natural change of -716. Net international migration added +187 and net domestic migration, people moving to or from other US counties, came to +1,482. The largest single component was domestic migration, which added 1,482 people.

Where Sullivan County is

The Census internal point of Sullivan County is at 43.361200, -72.222100. It sits in UTM zone 18N. The map shades New Hampshire's 10 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Sullivan County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Sullivan County

One incorporated place of 1,000+ people has residents in Sullivan County, 13,105 people together, or 30% of the county. Each figure counts only the part of the town inside Sullivan County; towns marked "part" extend into another county. The largest is Claremont with 13,105.

Counties bordering Sullivan County

The Census 2024 county adjacency file lists 6 neighbors for Sullivan County, including 2 across a state line. The most populous is Hillsborough County, NH, with 430,462 residents. Distances run between Census internal points in a straight line.

• Hillsborough County

  430,462 people

  40 mi SE

• Merrimack County

  157,869 people

  28 mi E

• Grafton County

  93,045 people

  43 mi NNE

• Cheshire County

  78,078 people

  30 mi S

• VT

  Windsor County, VT

  57,697 people

  24 mi NW

• VT

  Windham County, VT

  45,627 people

  36 mi SW

Distance to Concord and the nearest big city

Concord is 36.0 miles ESE of Sullivan County's internal point in a straight line. The nearest place of 100,000 or more is Manchester, NH (population 116,386), 47.0 miles away. The nearest place of 10,000 or more is Claremont, NH (population 13,105), 5.9 miles away.

Sullivan County FIPS code

The FIPS code of Sullivan County is 33019: state code 33 for New Hampshire plus county code 019. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $74,730.