Last official estimated population of Allen County was 355,857 (year 2014)[1]. This was 0.112% of total US population and 5.4% of total Indiana state population. Area of Allen County is 660.0 mi² (=1709.5 km²), in this year population density was 539.16 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Allen County population in 2026 would be 357,446 [0].
Historical population of Allen 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] +19.55 %/yr
[1840-1850] +11.03 %/yr
[1850-1860] +5.66 %/yr
[1860-1870] +4.02 %/yr
[1870-1880] +2.33 %/yr
[1880-1890] +1.99 %/yr
[1890-1900] +1.48 %/yr
[1900-1910] +1.91 %/yr
[1910-1920] +2.04 %/yr
[1920-1930] +2.53 %/yr
[1930-1940] +0.55 %/yr
[1940-1950] +1.71 %/yr
[1950-1960] +2.37 %/yr
[1960-1970] +1.91 %/yr
[1970-1980] +0.48 %/yr
[1980-1990] +0.22 %/yr
[1990-2000] +0.99 %/yr
[2000-2005] +0.68 %/yr
[2005-2010] +0.69 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Allen County? Visit this page: Settlements in Allen County, IN
Population of Allen County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 13573 | 12863 | 26,436 |
| 5 to 9 | 13673 | 13134 | 26,807 |
| 10 to 14 | 13546 | 13519 | 27,065 |
| 15 to 19 | 12866 | 12345 | 25,211 |
| 20 to 24 | 12314 | 12788 | 25,102 |
| 25 to 29 | 12210 | 12520 | 24,730 |
| 30 to 34 | 11833 | 12209 | 24,042 |
| 35 to 39 | 11175 | 11542 | 22,717 |
| 40 to 44 | 11555 | 11789 | 23,344 |
| 45 to 49 | 11107 | 11414 | 22,521 |
| 50 to 54 | 12294 | 12570 | 24,864 |
| 55 to 59 | 11790 | 12548 | 24,338 |
| 60 to 64 | 10059 | 10788 | 20,847 |
| 65 to 69 | 7536 | 8625 | 16,161 |
| 70 to 74 | 5095 | 5967 | 11,062 |
| 75 to 79 | 3309 | 4373 | 7,682 |
| 80 to 84 | 2335 | 3619 | 5,954 |
| 85+ | 2294 | 4741 | 7,035 |
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 |
| NH | 165192 | 174551 | 339,743 |
| WAC | 149650 | 156284 | 305,934 |
| WA | 144836 | 151332 | 296,168 |
| NHWAC | 137714 | 144955 | 282,669 |
| NHWA | 133484 | 140614 | 274,098 |
| BAC | 24629 | 26847 | 51,476 |
| NHBAC | 23587 | 25633 | 49,220 |
| BA | 21141 | 23235 | 44,376 |
| NHBA | 20488 | 22415 | 42,903 |
| H | 13372 | 12803 | 26,175 |
| HWAC | 11936 | 11329 | 23,265 |
| HWA | 11352 | 10718 | 22,070 |
| AAC | 7337 | 7436 | 14,773 |
| NHAAC | 7092 | 7209 | 14,301 |
| AA | 6376 | 6459 | 12,835 |
| NHAA | 6219 | 6331 | 12,550 |
| TOM | 5080 | 5251 | 10,331 |
| NHTOM | 4460 | 4600 | 9,060 |
| IAC | 2028 | 2101 | 4,129 |
| NHIAC | 1383 | 1493 | 2,876 |
| HBAC | 1042 | 1214 | 2,256 |
| IA | 903 | 881 | 1,784 |
| HBA | 653 | 820 | 1,473 |
| HTOM | 620 | 651 | 1,271 |
| HIAC | 645 | 608 | 1,253 |
| NHIA | 485 | 528 | 1,013 |
| HIA | 418 | 353 | 771 |
| NAC | 381 | 360 | 741 |
| HAAC | 245 | 227 | 472 |
| NA | 228 | 196 | 424 |
| HNAC | 209 | 177 | 386 |
| NHNAC | 172 | 183 | 355 |
| HNA | 172 | 133 | 305 |
| HAA | 157 | 128 | 285 |
| NHNA | 56 | 63 | 119 |
• Noble County population
28.1 mi,
320°
• DeKalb County
21.7 mi,
9°
• Defiance County
34.3 mi,
62°
• Huntington County
28 mi,
229°
• Adams County
24.9 mi,
163°
• Steuben County
38.3 mi,
5°
• Whitley County
22.6 mi,
277°
• Van Wert County
30.2 mi,
122°
• Wells County
25.7 mi,
196°
• Paulding County
25.6 mi,
85°
[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
*Delaware, Randolph Indiana Notes
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