Last official estimated population of Henry County was 20,121 (year 2014)[1]. This was 0.006% of total US population and 0.6% of total Iowa state population. Area of Henry County is 436.6 mi² (=1130.7 km²), in this year population density was 46.09 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Henry County population in 2026 would be 20,049 [0].
Historical population of Henry County for period 1840-2014 [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
[1840-1850] +8.73 %/yr
[1850-1860] +7.94 %/yr
[1860-1870] +1.39 %/yr
[1870-1880] -0.22 %/yr
[1880-1890] -1.04 %/yr
[1890-1900] +0.58 %/yr
[1900-1910] -0.71 %/yr
[1910-1920] -0.19 %/yr
[1920-1930] -0.35 %/yr
[1930-1940] +0.19 %/yr
[1940-1950] +0.39 %/yr
[1950-1960] -0.28 %/yr
[1960-1970] -0.04 %/yr
[1970-1980] +0.42 %/yr
[1980-1990] +0.18 %/yr
[1990-2000] +0.57 %/yr
[2000-2005] +0 %/yr
[2005-2010] -0.21 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Henry County? Visit this page: Settlements in Henry County, IA
Population of Henry County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 615 | 583 | 1,198 |
| 5 to 9 | 604 | 580 | 1,184 |
| 10 to 14 | 641 | 616 | 1,257 |
| 15 to 19 | 771 | 670 | 1,441 |
| 20 to 24 | 783 | 652 | 1,435 |
| 25 to 29 | 637 | 518 | 1,155 |
| 30 to 34 | 676 | 574 | 1,250 |
| 35 to 39 | 609 | 518 | 1,127 |
| 40 to 44 | 632 | 584 | 1,216 |
| 45 to 49 | 694 | 613 | 1,307 |
| 50 to 54 | 751 | 678 | 1,429 |
| 55 to 59 | 718 | 680 | 1,398 |
| 60 to 64 | 630 | 626 | 1,256 |
| 65 to 69 | 557 | 550 | 1,107 |
| 70 to 74 | 381 | 431 | 812 |
| 75 to 79 | 281 | 347 | 628 |
| 80 to 84 | 186 | 286 | 472 |
| 85+ | 189 | 356 | 545 |
Henry 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 | 9837 | 9430 | 19,267 |
| WAC | 9642 | 9334 | 18,976 |
| WA | 9479 | 9193 | 18,672 |
| NHWAC | 9184 | 8925 | 18,109 |
| NHWA | 9032 | 8791 | 17,823 |
| H | 518 | 432 | 950 |
| HWAC | 458 | 409 | 867 |
| HWA | 447 | 402 | 849 |
| BAC | 452 | 232 | 684 |
| AAC | 298 | 371 | 669 |
| NHBAC | 429 | 226 | 655 |
| NHAAC | 284 | 359 | 643 |
| AA | 256 | 338 | 594 |
| NHAA | 243 | 327 | 570 |
| BA | 366 | 166 | 532 |
| NHBA | 348 | 160 | 508 |
| TOM | 176 | 145 | 321 |
| NHTOM | 163 | 138 | 301 |
| IAC | 115 | 63 | 178 |
| NHIAC | 86 | 53 | 139 |
| IA | 56 | 13 | 69 |
| NHIA | 35 | 9 | 44 |
| NAC | 32 | 12 | 44 |
| HIAC | 29 | 10 | 39 |
| NHNAC | 23 | 10 | 33 |
| HBAC | 23 | 6 | 29 |
| NA | 22 | 7 | 29 |
| HAAC | 14 | 12 | 26 |
| HIA | 21 | 4 | 25 |
| HBA | 18 | 6 | 24 |
| HAA | 13 | 11 | 24 |
| NHNA | 16 | 5 | 21 |
| HTOM | 13 | 7 | 20 |
| HNAC | 9 | 2 | 11 |
| HNA | 6 | 2 | 8 |
• Muscatine County population
40.9 mi, 
32°
• Des Moines County
19.3 mi, 
104°
• Lee County
23.6 mi, 
171°
• Washington County
25.5 mi, 
338°
• Jefferson County
22.1 mi, 
273°
• Louisa County
21.9 mi, 
42°
• Keokuk County
40.3 mi, 
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• Van Buren County
26.7 mi, 
233°
• Henderson County
33.6 mi, 
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• Clark County
41.1 mi, 
193°
[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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