Last official estimated population of Northumberland County was 94,351 (year 2014)[1]. This was 0.03% of total US population and 0.7% of total Pennsylvania state population. Area of Northumberland County is 477.5 mi² (=1236.8 km²), in this year population density was 197.58 p/mi². If population growth rate would be same as in period 2010-2014 (-0.05%/yr), Northumberland County population in 2026 would be 93,822 [0].
Historical population of Northumberland 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] +4.94 %/yr
[1800-1810] +2.71 %/yr
[1810-1820] -8.21 %/yr
[1820-1830] +1.63 %/yr
[1830-1840] +1 %/yr
[1840-1850] +1.51 %/yr
[1850-1860] +2.2 %/yr
[1860-1870] +3.66 %/yr
[1870-1880] +2.51 %/yr
[1880-1890] +3.47 %/yr
[1890-1900] +1.98 %/yr
[1900-1910] +2.06 %/yr
[1910-1920] +0.92 %/yr
[1920-1930] +0.51 %/yr
[1930-1940] -0.13 %/yr
[1940-1950] -0.8 %/yr
[1950-1960] -1.17 %/yr
[1960-1970] -0.49 %/yr
[1970-1980] +0.12 %/yr
[1980-1990] -0.37 %/yr
[1990-2000] -0.2 %/yr
[2000-2005] -0.28 %/yr
[2005-2010] +0.21 %/yr
[2010-2014] -0.05 %/yr
Looking for settlements in Northumberland County? Visit this page: Settlements in Northumberland County, PA
Population of Northumberland County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 2558 | 2441 | 4,999 |
| 5 to 9 | 2716 | 2539 | 5,255 |
| 10 to 14 | 2666 | 2578 | 5,244 |
| 15 to 19 | 2695 | 2285 | 4,980 |
| 20 to 24 | 2861 | 2469 | 5,330 |
| 25 to 29 | 3131 | 2633 | 5,764 |
| 30 to 34 | 2945 | 2613 | 5,558 |
| 35 to 39 | 2809 | 2425 | 5,234 |
| 40 to 44 | 3023 | 2832 | 5,855 |
| 45 to 49 | 3293 | 2991 | 6,284 |
| 50 to 54 | 3615 | 3486 | 7,101 |
| 55 to 59 | 3582 | 3659 | 7,241 |
| 60 to 64 | 3304 | 3301 | 6,605 |
| 65 to 69 | 2717 | 2940 | 5,657 |
| 70 to 74 | 1940 | 2263 | 4,203 |
| 75 to 79 | 1458 | 1832 | 3,290 |
| 80 to 84 | 991 | 1474 | 2,465 |
| 85+ | 890 | 1989 | 2,879 |
Northumberland 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 | 45629 | 45432 | 91,061 |
| WAC | 44977 | 45821 | 90,798 |
| WA | 44434 | 45307 | 89,741 |
| NHWAC | 43657 | 44698 | 88,355 |
| NHWA | 43222 | 44266 | 87,488 |
| BAC | 2224 | 846 | 3,070 |
| H | 1565 | 1318 | 2,883 |
| NHBAC | 1975 | 664 | 2,639 |
| HWAC | 1320 | 1123 | 2,443 |
| BA | 1866 | 540 | 2,406 |
| HWA | 1212 | 1041 | 2,253 |
| NHBA | 1703 | 419 | 2,122 |
| TOM | 584 | 536 | 1,120 |
| NHTOM | 458 | 445 | 903 |
| AAC | 259 | 337 | 596 |
| IAC | 308 | 268 | 576 |
| NHAAC | 231 | 318 | 549 |
| HBAC | 249 | 182 | 431 |
| AA | 173 | 253 | 426 |
| NHIAC | 217 | 187 | 404 |
| NHAA | 160 | 241 | 401 |
| HBA | 163 | 121 | 284 |
| IA | 124 | 96 | 220 |
| HTOM | 126 | 91 | 217 |
| HIAC | 91 | 81 | 172 |
| NHIA | 80 | 50 | 130 |
| HIA | 44 | 46 | 90 |
| NAC | 42 | 36 | 78 |
| NHNAC | 23 | 27 | 50 |
| HAAC | 28 | 19 | 47 |
| NA | 13 | 18 | 31 |
| HNAC | 19 | 9 | 28 |
| HAA | 13 | 12 | 25 |
| NHNA | 6 | 11 | 17 |
| HNA | 7 | 7 | 14 |
• Dauphin County population
30.6 mi, 
188°
• Schuylkill County
27.7 mi, 
111°
• Lebanon County
35.6 mi, 
158°
• Lycoming County
38.5 mi, 
332°
• Columbia County
20.8 mi, 
49°
• Union County
19.6 mi, 
292°
• Snyder County
20.1 mi, 
250°
• Juniata County
42.4 mi, 
238°
• Montour County
12.5 mi, 
10°
• Sullivan County
41.9 mi, 14°
[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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