Last official estimated population of Hillsborough County was 400,982 (year 2014)[1]. This was 0.126% of total US population and 30.1% of total New Hampshire state population. Area of Hillsborough County is 892.2 mi² (=2310.8 km²), in this year population density was 449.42 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Hillsborough County population in 2026 would be 401,766 [0].
Historical population of Hillsborough County for period 1790-2014 [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
[1790-1800] +2.94 %/yr
[1800-1810] +1.16 %/yr
[1810-1820] +0.9 %/yr
[1820-1830] -3.5 %/yr
[1830-1840] +1.2 %/yr
[1840-1850] +3.07 %/yr
[1850-1860] +0.78 %/yr
[1860-1870] +0.33 %/yr
[1870-1880] +1.65 %/yr
[1880-1890] +2.12 %/yr
[1890-1900] +1.91 %/yr
[1900-1910] +1.13 %/yr
[1910-1920] +0.72 %/yr
[1920-1930] +0.34 %/yr
[1930-1940] +0.33 %/yr
[1940-1950] +0.81 %/yr
[1950-1960] +1.27 %/yr
[1960-1970] +2.31 %/yr
[1970-1980] +2.13 %/yr
[1980-1990] +1.96 %/yr
[1990-2000] +1.27 %/yr
[2000-2005] +0.8 %/yr
[2005-2010] +0.22 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Hillsborough County? Visit this page: Settlements in Hillsborough County, NH
Population of Hillsborough County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 11292 | 10725 | 22,017 |
| 5 to 9 | 11985 | 11717 | 23,702 |
| 10 to 14 | 13142 | 12530 | 25,672 |
| 15 to 19 | 13715 | 12911 | 26,626 |
| 20 to 24 | 13322 | 12644 | 25,966 |
| 25 to 29 | 13201 | 12722 | 25,923 |
| 30 to 34 | 13067 | 12583 | 25,650 |
| 35 to 39 | 12091 | 12201 | 24,292 |
| 40 to 44 | 13752 | 13840 | 27,592 |
| 45 to 49 | 15401 | 15515 | 30,916 |
| 50 to 54 | 17260 | 17297 | 34,557 |
| 55 to 59 | 15624 | 15685 | 31,309 |
| 60 to 64 | 12172 | 12519 | 24,691 |
| 65 to 69 | 9507 | 10155 | 19,662 |
| 70 to 74 | 6118 | 6907 | 13,025 |
| 75 to 79 | 4012 | 5032 | 9,044 |
| 80 to 84 | 2795 | 4032 | 6,827 |
| 85+ | 2514 | 5199 | 7,713 |
Hillsborough 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 | 188653 | 192383 | 381,036 |
| WAC | 186542 | 190754 | 377,296 |
| WA | 183026 | 187278 | 370,304 |
| NHWAC | 175768 | 180252 | 356,020 |
| NHWA | 172703 | 177269 | 349,972 |
| H | 12317 | 11831 | 24,148 |
| HWAC | 10774 | 10502 | 21,276 |
| HWA | 10323 | 10009 | 20,332 |
| AAC | 8806 | 8914 | 17,720 |
| NHAAC | 8613 | 8748 | 17,361 |
| AA | 7621 | 7744 | 15,365 |
| NHAA | 7524 | 7682 | 15,206 |
| BAC | 7460 | 6419 | 13,879 |
| NHBAC | 6111 | 5207 | 11,318 |
| BA | 5826 | 4800 | 10,626 |
| NHBA | 4799 | 3911 | 8,710 |
| TOM | 3686 | 3634 | 7,320 |
| NHTOM | 3182 | 3108 | 6,290 |
| IAC | 1790 | 1669 | 3,459 |
| NHIAC | 1336 | 1276 | 2,612 |
| HBAC | 1349 | 1212 | 2,561 |
| HBA | 1027 | 889 | 1,916 |
| IA | 671 | 608 | 1,279 |
| HTOM | 504 | 526 | 1,030 |
| HIAC | 454 | 393 | 847 |
| NHIA | 387 | 364 | 751 |
| NAC | 283 | 291 | 574 |
| HIA | 284 | 244 | 528 |
| HAAC | 193 | 166 | 359 |
| NHNAC | 181 | 168 | 349 |
| NA | 140 | 150 | 290 |
| HNAC | 102 | 123 | 225 |
| HNA | 82 | 101 | 183 |
| HAA | 97 | 62 | 159 |
| NHNA | 58 | 49 | 107 |
• Middlesex County population
34.1 mi, 
150°
• Worcester County
42.9 mi, 
194°
• Essex County
47.3 mi, 
113°
• Rockingham County
32 mi, 
80°
• Merrimack County
26.9 mi, 
4°
• Strafford County
43.5 mi, 
52°
• Cheshire County
26.6 mi, 
272°
• Franklin County
49.5 mi, 
242°
• Belknap County
44.6 mi, 
19°
• Sullivan County
40 mi, 
320°
[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
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