Last official estimated population of Penobscot County was 153,831 (year 2014)[1]. This was 0.048% of total US population and 11.6% of total Maine state population. Area of Penobscot County is 3,557.0 mi² (=9212.7 km²), in this year population density was 43.25 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Penobscot County population in 2025 would be 153,578 [0].
Historical population of Penobscot County for period 1820-2014 [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
[1820-1830] +8.56 %/yr
[1830-1840] +3.78 %/yr
[1840-1850] +3.28 %/yr
[1850-1860] +1.43 %/yr
[1860-1870] +0.33 %/yr
[1870-1880] -0.64 %/yr
[1880-1890] +0.33 %/yr
[1890-1900] +0.45 %/yr
[1900-1910] +1.13 %/yr
[1910-1920] +0.28 %/yr
[1920-1930] +0.52 %/yr
[1930-1940] +0.5 %/yr
[1940-1950] +1.09 %/yr
[1950-1960] +1.56 %/yr
[1960-1970] -0.08 %/yr
[1970-1980] +0.89 %/yr
[1980-1990] +0.68 %/yr
[1990-2000] -0.12 %/yr
[2000-2005] +0.66 %/yr
[2005-2010] +0.55 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Penobscot County? Visit this page: Settlements in Penobscot County, ME
Population of Penobscot County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 3760 | 3569 | 7,329 |
| 5 to 9 | 4179 | 3844 | 8,023 |
| 10 to 14 | 4180 | 3988 | 8,168 |
| 15 to 19 | 5589 | 5007 | 10,596 |
| 20 to 24 | 6174 | 5714 | 11,888 |
| 25 to 29 | 5700 | 5349 | 11,049 |
| 30 to 34 | 4492 | 4482 | 8,974 |
| 35 to 39 | 3995 | 4162 | 8,157 |
| 40 to 44 | 4492 | 4660 | 9,152 |
| 45 to 49 | 4978 | 5280 | 10,258 |
| 50 to 54 | 5896 | 6179 | 12,075 |
| 55 to 59 | 5788 | 6073 | 11,861 |
| 60 to 64 | 5154 | 5346 | 10,500 |
| 65 to 69 | 4005 | 4290 | 8,295 |
| 70 to 74 | 2815 | 3092 | 5,907 |
| 75 to 79 | 1944 | 2415 | 4,359 |
| 80 to 84 | 1414 | 1974 | 3,388 |
| 85+ | 1201 | 2234 | 3,435 |
Penobscot 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 | 74782 | 76710 | 151,492 |
| WAC | 73067 | 75270 | 148,337 |
| NHWAC | 72208 | 74409 | 146,617 |
| WA | 71876 | 74057 | 145,933 |
| NHWA | 71083 | 73252 | 144,335 |
| IAC | 1611 | 1576 | 3,187 |
| NHIAC | 1548 | 1512 | 3,060 |
| TOM | 1226 | 1243 | 2,469 |
| NHTOM | 1157 | 1183 | 2,340 |
| AAC | 1056 | 1164 | 2,220 |
| NHAAC | 1025 | 1145 | 2,170 |
| BAC | 1261 | 897 | 2,158 |
| NHBAC | 1169 | 829 | 1,998 |
| H | 974 | 948 | 1,922 |
| IA | 945 | 898 | 1,843 |
| NHIA | 917 | 870 | 1,787 |
| HWAC | 859 | 861 | 1,720 |
| AA | 776 | 900 | 1,676 |
| NHAA | 760 | 887 | 1,647 |
| HWA | 793 | 805 | 1,598 |
| BA | 903 | 533 | 1,436 |
| NHBA | 838 | 494 | 1,332 |
| HBAC | 92 | 68 | 160 |
| NAC | 74 | 70 | 144 |
| HTOM | 69 | 60 | 129 |
| NHNAC | 64 | 65 | 129 |
| HIAC | 63 | 64 | 127 |
| HBA | 65 | 39 | 104 |
| NA | 30 | 27 | 57 |
| HIA | 28 | 28 | 56 |
| NHNA | 27 | 24 | 51 |
| HAAC | 31 | 19 | 50 |
| HAA | 16 | 13 | 29 |
| HNAC | 10 | 5 | 15 |
| HNA | 3 | 3 | 6 |
• Kennebec County population
87.1 mi, 
218°
• Aroostook County
91.1 mi, 
0°
• Hancock County
60.1 mi, 
166°
• Somerset County
63.8 mi, 
276°
• Knox County
96.2 mi, 
190°
• Waldo County
66.6 mi, 
200°
• Lincoln County
106.3 mi, 203°
• Washington County
59.9 mi, 
120°
• Franklin County
91.7 mi, 
250°
• Piscataquis County
41 mi, 
328°
[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 8 Maine Notes
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