Last official estimated population of Allen County was 20,040 (year 2014)[1]. This was 0.006% of total US population and 0.5% of total Kentucky state population. Area of Allen County is 351.9 mi² (=911.3 km²), in this year population density was 56.95 p/mi². If population growth rate would be same as in period 2010-2014 (+0.11%/yr), Allen County population in 2026 would be 20,294 [0].
Historical population of Allen 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] +1.99 %/yr
[1830-1840] +1.23 %/yr
[1840-1850] +1.78 %/yr
[1850-1860] +0.5 %/yr
[1860-1870] +1.15 %/yr
[1870-1880] +1.62 %/yr
[1880-1890] +1.25 %/yr
[1890-1900] +0.68 %/yr
[1900-1910] +0.15 %/yr
[1910-1920] +1.2 %/yr
[1920-1930] -0.99 %/yr
[1930-1940] +0.21 %/yr
[1940-1950] -1.16 %/yr
[1950-1960] -1.16 %/yr
[1960-1970] +0.26 %/yr
[1970-1980] +1.15 %/yr
[1980-1990] +0.35 %/yr
[1990-2000] +1.98 %/yr
[2000-2005] +1.23 %/yr
[2005-2010] +1.08 %/yr
[2010-2014] +0.11 %/yr
Looking for settlements in Allen County? Visit this page: Settlements in Allen County, KY
Population of Allen County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 620 | 637 | 1,257 |
| 5 to 9 | 688 | 666 | 1,354 |
| 10 to 14 | 758 | 697 | 1,455 |
| 15 to 19 | 666 | 565 | 1,231 |
| 20 to 24 | 592 | 670 | 1,262 |
| 25 to 29 | 621 | 593 | 1,214 |
| 30 to 34 | 568 | 599 | 1,167 |
| 35 to 39 | 592 | 606 | 1,198 |
| 40 to 44 | 720 | 654 | 1,374 |
| 45 to 49 | 664 | 725 | 1,389 |
| 50 to 54 | 705 | 796 | 1,501 |
| 55 to 59 | 743 | 656 | 1,399 |
| 60 to 64 | 617 | 678 | 1,295 |
| 65 to 69 | 539 | 605 | 1,144 |
| 70 to 74 | 420 | 437 | 857 |
| 75 to 79 | 277 | 320 | 597 |
| 80 to 84 | 175 | 214 | 389 |
| 85+ | 101 | 200 | 301 |
Allen 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 |
| WAC | 9875 | 10154 | 20,029 |
| NH | 9859 | 10139 | 19,998 |
| WA | 9745 | 10049 | 19,794 |
| NHWAC | 9681 | 9982 | 19,663 |
| NHWA | 9569 | 9880 | 19,449 |
| H | 207 | 179 | 386 |
| HWAC | 194 | 172 | 366 |
| HWA | 176 | 169 | 345 |
| BAC | 194 | 146 | 340 |
| NHBAC | 178 | 140 | 318 |
| TOM | 133 | 108 | 241 |
| BA | 131 | 99 | 230 |
| NHBA | 124 | 96 | 220 |
| NHTOM | 114 | 105 | 219 |
| IAC | 96 | 76 | 172 |
| NHIAC | 84 | 73 | 157 |
| AAC | 30 | 49 | 79 |
| NHAAC | 29 | 48 | 77 |
| IA | 34 | 29 | 63 |
| NHIA | 33 | 26 | 59 |
| AA | 19 | 33 | 52 |
| NHAA | 19 | 32 | 51 |
| HTOM | 19 | 3 | 22 |
| HBAC | 16 | 6 | 22 |
| HIAC | 12 | 3 | 15 |
| NAC | 7 | 5 | 12 |
| HBA | 7 | 3 | 10 |
| NHNAC | 2 | 5 | 7 |
| HNAC | 5 | 0 | 5 |
| HNA | 4 | 0 | 4 |
| NA | 4 | 0 | 4 |
| HIA | 1 | 3 | 4 |
| HAAC | 1 | 1 | 2 |
| HAA | 0 | 1 | 1 |
| NHNA | 0 | 0 | 0 |
• Sumner County population
24.2 mi, 
217°
• Warren County
21.2 mi, 
322°
• Barren County
20.8 mi, 
45°
• Macon County
18.1 mi, 
144°
• Smith County
36.9 mi, 
157°
• Simpson County
21.6 mi, 
268°
• Edmonson County
33 mi, 
357°
• Monroe County
26.6 mi, 
95°
• Metcalfe County
35.1 mi, 
61°
• Trousdale County
24.8 mi, 
175°
[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 3 Kentucky Notes
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