Last official estimated population of Merrimack County was 146,411 (year 2014)[1]. This was 0.046% of total US population and 11% of total New Hampshire state population. Area of Merrimack County is 956.4 mi² (=2477.2 km²), in this year population density was 153.08 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Merrimack County population in 2025 would be 146,318 [0].
Historical population of Merrimack County for period 1830-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1830-1840] +0.46 %/yr
[1840-1850] +1.07 %/yr
[1850-1860] +0.26 %/yr
[1860-1870] +0.18 %/yr
[1870-1880] +0.94 %/yr
[1880-1890] +0.66 %/yr
[1890-1900] +0.59 %/yr
[1900-1910] +0.17 %/yr
[1910-1920] -0.3 %/yr
[1920-1930] +0.82 %/yr
[1930-1940] +0.78 %/yr
[1940-1950] +0.37 %/yr
[1950-1960] +0.73 %/yr
[1960-1970] +1.79 %/yr
[1970-1980] +1.96 %/yr
[1980-1990] +2.03 %/yr
[1990-2000] +1.26 %/yr
[2000-2005] +1.28 %/yr
[2005-2010] +0.17 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Merrimack County? Visit this page: Settlements in Merrimack County, NH
Population of Merrimack County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 3513 | 3490 | 7,003 |
| 5 to 9 | 4020 | 3814 | 7,834 |
| 10 to 14 | 4460 | 4358 | 8,818 |
| 15 to 19 | 5182 | 4982 | 10,164 |
| 20 to 24 | 5037 | 4811 | 9,848 |
| 25 to 29 | 4360 | 3898 | 8,258 |
| 30 to 34 | 4235 | 4188 | 8,423 |
| 35 to 39 | 4056 | 4083 | 8,139 |
| 40 to 44 | 4775 | 4726 | 9,501 |
| 45 to 49 | 5357 | 5349 | 10,706 |
| 50 to 54 | 6119 | 6272 | 12,391 |
| 55 to 59 | 5856 | 6303 | 12,159 |
| 60 to 64 | 5014 | 5258 | 10,272 |
| 65 to 69 | 3921 | 4217 | 8,138 |
| 70 to 74 | 2637 | 2902 | 5,539 |
| 75 to 79 | 1688 | 2060 | 3,748 |
| 80 to 84 | 1231 | 1687 | 2,918 |
| 85+ | 1053 | 2259 | 3,312 |
Merrimack County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 71055 | 73301 | 144,356 |
| WAC | 69834 | 72014 | 141,848 |
| WA | 68875 | 70987 | 139,862 |
| NHWAC | 68540 | 70786 | 139,326 |
| NHWA | 67655 | 69839 | 137,494 |
| AAC | 1540 | 1840 | 3,380 |
| NHAAC | 1515 | 1808 | 3,323 |
| H | 1459 | 1356 | 2,815 |
| AA | 1244 | 1531 | 2,775 |
| NHAA | 1236 | 1515 | 2,751 |
| BAC | 1483 | 1187 | 2,670 |
| HWAC | 1294 | 1228 | 2,522 |
| NHBAC | 1326 | 1074 | 2,400 |
| HWA | 1220 | 1148 | 2,368 |
| TOM | 1005 | 1073 | 2,078 |
| BA | 1155 | 845 | 2,000 |
| NHTOM | 919 | 987 | 1,906 |
| NHBA | 1044 | 769 | 1,813 |
| IAC | 667 | 673 | 1,340 |
| NHIAC | 594 | 599 | 1,193 |
| IA | 212 | 192 | 404 |
| NHIA | 182 | 165 | 347 |
| HBAC | 157 | 113 | 270 |
| HBA | 111 | 76 | 187 |
| HTOM | 86 | 86 | 172 |
| HIAC | 73 | 74 | 147 |
| NAC | 54 | 66 | 120 |
| NHNAC | 46 | 58 | 104 |
| HIA | 30 | 27 | 57 |
| HAAC | 25 | 32 | 57 |
| NA | 23 | 29 | 52 |
| NHNA | 19 | 26 | 45 |
| HAA | 8 | 16 | 24 |
| HNAC | 8 | 8 | 16 |
| HNA | 4 | 3 | 7 |
• Hillsborough County population
26.9 mi, 
184°
• Rockingham County
36.3 mi, 
126°
• York County
51.6 mi, 
80°
• Strafford County
32.4 mi, 
90°
• Grafton County
44.1 mi, 
349°
• Cheshire County
38.6 mi, 
227°
• Belknap County
19.8 mi, 
40°
• Windsor County
49.8 mi, 
292°
• Carroll County
46 mi, 
31°
• Sullivan County
27.6 mi, 
278°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
See note 1 New Hampshire Notes
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