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Merrimack County, NH Demographics

Merrimack County, NH is the 3rd most populous of 10 counties in New Hampshire, with 153,824 residents across 933 square miles. That is about 165 people per square mile.

At the 2020 census

Population 153,824
Land area 933 sq mi
Density 165 / sq mi

Data: 2020 Census · American Community Survey 2024

How Merrimack County compares to the US

We're computing this county's comparison table — check back shortly. Population, land area, and density above are already exact.

Central Location: Merrimack County, NH

Measured from the county's main population center using 2020 census blocks.

We're computing the drive-time and radius areas around Merrimack County, NH — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.

Census tracts in Merrimack County, NH

Name Population Sq mi Per sq mi
Census Tract 442 6,614 19.6 337
Census Tract 400 6,185 44.1 140
Census Tract 390 5,914 43.3 137
Census Tract 360 5,576 46.2 121
Census Tract 328 5,182 18.9 274
Census Tract 443 5,105 7.1 723
Census Tract 32.01 5,064 5.9 865
Census Tract 326 4,917 5.5 897
Census Tract 440 4,872 28.5 171
Census Tract 385 4,850 83.4 58
Census Tract 340 4,834 34.4 140
Census Tract 31 4,707 20.5 230
Census Tract 430.02 4,499 14.6 308
Census Tract 30.01 4,350 12.4 351
Census Tract 329 4,345 1.2 3,635
Census Tract 310.01 4,249 18.4 231
Census Tract 430.01 4,242 12.8 331
Census Tract 405.02 4,150 78.4 53
Census Tract 350 4,075 24.0 170
Census Tract 380 3,998 24.9 161
Census Tract 310.02 3,980 9.8 407
Census Tract 30.06 3,907 4.0 971
Census Tract 327.06 3,889 2.5 1,557
Census Tract 425 3,828 79.7 48
Census Tract 325 3,802 13.0 292
Census Tract 321 3,766 1.7 2,248
Census Tract 441 3,694 6.5 569
Census Tract 415 3,674 93.7 39
Census Tract 324 3,237 1.2 2,636
Census Tract 300 3,005 30.9 97
Census Tract 322 2,728 1.0 2,770
Census Tract 330 2,665 21.2 126
Census Tract 410.02 2,587 12.5 208
Census Tract 370 2,389 43.9 54
Census Tract 32.02 2,143 16.8 128
Census Tract 410.01 1,813 9.9 184
Census Tract 323 1,763 0.3 5,742
Census Tract 405.01 1,662 35.2 47
Census Tract 327.01 1,548 5.1 301

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About this page

This page shows demographics for a US county from the 2020 census and the American Community Survey: population, land area, density, urban share, and how the county compares to national averages for income, housing, age, and more.

Counties subdivide into census tracts, listed below with their populations. The drive-time and radius tables measure the population around the county's main population center.

Read how BlockAtlas computes population within an area →