Data / Rankings / Housing units authorized by building permits / Counties in New Hampshire

Counties in New Hampshire by housing units authorized by building permits, 2025

Rockingham County had the highest housing units authorized by building permits of 10 counties in 2025, at 1,876. Sullivan County had the lowest, at 133. The median was 416. Source: the U.S. Census Bureau.

Highest1,876Rockingham County
Lowest133Sullivan County
Median41610 counties

All counties, 2025

CSVChart (SVG)

Rockingham CountyRockingham County: 1,876 count1,876Hillsborough CountyHillsborough County: 632 count632Carroll CountyCarroll County: 505 count505Strafford CountyStrafford County: 450 count450Belknap CountyBelknap County: 423 count423Grafton CountyGrafton County: 408 count408Merrimack CountyMerrimack County: 286 count286Cheshire CountyCheshire County: 167 count167Coos CountyCoos County: 150 count150Sullivan CountySullivan County: 133 count133
count. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-10.

Full ranking

RankCounties2025
count		Change on 2024
1Rockingham County Estimated1,876+44.3%
2Hillsborough County Estimated632-27.5%
3Carroll County Estimated505+42.3%
4Strafford County Estimated450-52.2%
5Belknap County Estimated423+50%
6Grafton County Estimated408-13.6%
7Merrimack County Estimated286-19.4%
8Cheshire County Estimated167-2.9%
9Coos County Estimated150+30.4%
10Sullivan County Estimated133+33%

Other periods

About this ranking

Annual number of new privately owned housing units authorized by building permits, from the US Census Bureau Building Permits Survey.

Final annual county estimates include imputation for missing reports. Counts housing units, not buildings, starts, completions or sales. Covers permit-issuing areas; areas where permits are not required are outside the survey. Not seasonally adjusted or expressed as an annualized monthly rate. The total is the sum of units in the four published structure categories; inputs are retained.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Building Permits Survey: final annual county estimates of new privately owned housing units authorized, including imputation. https://www2.census.gov/econ/bps/County/co2025a.txt. Retrieved 2026-10-10.

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Rank Counties in New Hampshire by housing units authorized by building permits using official data, and cite the source.
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Questions

Which county has the highest housing units authorized by building permits?

Rockingham County, with 1,876 in 2025, according to the U.S. Census Bureau.

Which county has the lowest housing units authorized by building permits?

Sullivan County, with 133 in 2025.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Building Permits Survey: final annual county estimates of new privately owned housing units authorized, including imputation. Retrieved 2026-10-10.

Housing units authorized by building permits: other rankings

Counties in New Hampshire: more rankings