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County | 2024 Pop. | Change (2020) | Area (mi²) | Density (/mi²) | Location |
---|---|---|---|---|---|
Hillsborough County | 427,215 | 1.02% | 339 | 487 | |
Rockingham County | 321,745 | 2.26% | 268 | 463 | |
Merrimack County | 157,747 | 2.41% | 360 | 169 | |
Strafford County | 133,915 | 2.17% | 142 | 365 | |
Grafton County | 93,161 | 2.15% | 660 | 55 | |
Cheshire County | 77,943 | 1.82% | 273 | 110 | |
Belknap County | 65,349 | 2.47% | 155 | 163 | |
Carroll County | 52,742 | 4.97% | 360 | 57 | |
Sullivan County | 44,020 | 2.21% | 208 | 82 | |
Coos County | 31,268 | 0.13% | 693 | 17 |
There are 10 counties in New Hampshire. The most populous county in New Hampshire is Hillsborough County, which is home to 415,427 residents. This is about 30.61% of the state’s total population. Since 2010, Hillsborough County has grown 3.54%. The second-most populous county in New Hampshire is Rockingham County with a population of 309,176 people, about 22.79% of the population, followed by Merrimack County with 151,132 people, about 11.14% of the state population. Both Rockingham and Merrimack have grown since the 2010 Census by 4.70% and 3.24%, respectively.
Of New Hampshire’s 10 counties, Coos County has the fewest residents at 31,589. This is about 2.33% of the state’s total population. The population density is 17.60 persons per square mile. The second-least populated county in New Hampshire is Sullivan County, which is home to 43,144 people, about 3.18% of the state’s total population. This is followed by Carroll County with a population of 48,799 people.
Seven out of the 10 New Hampshire counties have experienced growth since the 2010 Census. Strafford County experienced the highest population growth of 5.60%, followed by Rockingham County with 4.70% and Hillsborough County with 3.54%.
The three counties that experienced a population decline since 2010 are Coos County (4.20%), Sullivan County (1.41%), and Cheshire County (0.73%)
State | Counties |
---|---|
Texas | 254 |
Georgia | 159 |
Virginia | 133 |
Kentucky | 120 |
Missouri | 115 |
Kansas | 105 |
Illinois | 102 |
North Carolina | 100 |
Iowa | 99 |
Tennessee | 95 |
Nebraska | 93 |
Indiana | 92 |
Ohio | 88 |
Minnesota | 87 |
Michigan | 83 |
Mississippi | 82 |
Puerto Rico | 78 |
Oklahoma | 77 |
Arkansas | 75 |
Wisconsin | 72 |
Alabama | 67 |
Florida | 67 |
Pennsylvania | 67 |
South Dakota | 66 |
Colorado | 64 |
Louisiana | 64 |
New York | 62 |
California | 58 |
Montana | 56 |
West Virginia | 55 |
North Dakota | 53 |
South Carolina | 46 |
Idaho | 44 |
Washington | 39 |
Oregon | 36 |
New Mexico | 33 |
Alaska | 30 |
Utah | 29 |
Maryland | 24 |
Wyoming | 23 |
New Jersey | 21 |
Nevada | 17 |
Maine | 16 |
Arizona | 15 |
Massachusetts | 14 |
Vermont | 14 |
New Hampshire | 10 |
Connecticut | 9 |
Hawaii | 5 |
Rhode Island | 5 |
Delaware | 3 |
District of Columbia | 1 |