Last official estimated population of Franklin County was 10,685 (year 2014)[1]. This was 0.003% of total US population and 0.3% of total Iowa state population. Area of Franklin County is 582.5 mi² (=1508.7 km²), in this year population density was 18.34 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Franklin County population in 2025 would be 10,699 [0].
Historical population of Franklin County for period 1860-2014 [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
[1860-1870] +13.73 %/yr
[1870-1880] +8.02 %/yr
[1880-1890] +2.3 %/yr
[1890-1900] +1.54 %/yr
[1900-1910] -0.14 %/yr
[1910-1920] +0.67 %/yr
[1920-1930] +0.36 %/yr
[1930-1940] -0 %/yr
[1940-1950] -0.07 %/yr
[1950-1960] -0.5 %/yr
[1960-1970] -1.53 %/yr
[1970-1980] -0.17 %/yr
[1980-1990] -1.36 %/yr
[1990-2000] -0.6 %/yr
[2000-2005] +0.12 %/yr
[2005-2010] -0.16 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Franklin County? Visit this page: Settlements in Franklin County, IA
Population of Franklin County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 327 | 265 | 592 |
| 5 to 9 | 395 | 292 | 687 |
| 10 to 14 | 339 | 357 | 696 |
| 15 to 19 | 320 | 301 | 621 |
| 20 to 24 | 285 | 303 | 588 |
| 25 to 29 | 243 | 226 | 469 |
| 30 to 34 | 337 | 274 | 611 |
| 35 to 39 | 267 | 272 | 539 |
| 40 to 44 | 306 | 270 | 576 |
| 45 to 49 | 282 | 310 | 592 |
| 50 to 54 | 376 | 380 | 756 |
| 55 to 59 | 448 | 418 | 866 |
| 60 to 64 | 377 | 372 | 749 |
| 65 to 69 | 291 | 287 | 578 |
| 70 to 74 | 214 | 231 | 445 |
| 75 to 79 | 175 | 206 | 381 |
| 80 to 84 | 116 | 184 | 300 |
| 85+ | 140 | 250 | 390 |
Franklin 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 | 5113 | 5090 | 10,203 |
| WA | 5050 | 5037 | 10,087 |
| NH | 4558 | 4650 | 9,208 |
| NHWAC | 4494 | 4584 | 9,078 |
| NHWA | 4445 | 4548 | 8,993 |
| H | 680 | 548 | 1,228 |
| HWAC | 619 | 506 | 1,125 |
| HWA | 605 | 489 | 1,094 |
| BAC | 88 | 60 | 148 |
| TOM | 65 | 56 | 121 |
| IAC | 50 | 46 | 96 |
| AAC | 43 | 52 | 95 |
| BA | 58 | 33 | 91 |
| NHTOM | 51 | 39 | 90 |
| NHBAC | 57 | 31 | 88 |
| NHAAC | 29 | 46 | 75 |
| AA | 33 | 40 | 73 |
| HBAC | 31 | 29 | 60 |
| NHAA | 20 | 37 | 57 |
| NHIAC | 30 | 24 | 54 |
| IA | 21 | 28 | 49 |
| HBA | 25 | 21 | 46 |
| NHBA | 33 | 12 | 45 |
| HIAC | 20 | 22 | 42 |
| HTOM | 14 | 17 | 31 |
| HIA | 13 | 15 | 28 |
| NAC | 14 | 7 | 21 |
| NHIA | 8 | 13 | 21 |
| HAAC | 14 | 6 | 20 |
| HAA | 13 | 3 | 16 |
| NA | 11 | 4 | 15 |
| HNAC | 10 | 3 | 13 |
| HNA | 10 | 3 | 13 |
| NHNAC | 4 | 4 | 8 |
| NHNA | 1 | 1 | 2 |
• Cerro Gordo County population
23.4 mi, 
2°
• Hardin County
24 mi, 
176°
• Floyd County
32.8 mi, 
48°
• Hamilton County
32.7 mi, 
222°
• Butler County
24.9 mi, 
90°
• Wright County
23.5 mi, 
269°
• Grundy County
33.6 mi, 
133°
• Hancock County
33.5 mi, 
314°
• Humboldt County
47.3 mi, 273°
• Worth County
44 mi, 1°
[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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