Last official estimated population of Greene County was 9,332 (year 2014)[1]. This was 0.003% of total US population and 0.3% of total Iowa state population. Area of Greene County is 571.2 mi² (=1479.4 km²), in this year population density was 16.34 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Greene County population in 2025 would be 9,321 [0].
Historical population of Greene 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] +12.91 %/yr
[1870-1880] +10.65 %/yr
[1880-1890] +2.18 %/yr
[1890-1900] +1.21 %/yr
[1900-1910] -1.06 %/yr
[1910-1920] +0.27 %/yr
[1920-1930] +0.04 %/yr
[1930-1940] +0.04 %/yr
[1940-1950] -0.65 %/yr
[1950-1960] -0.78 %/yr
[1960-1970] -1.22 %/yr
[1970-1980] -0.48 %/yr
[1980-1990] -1.86 %/yr
[1990-2000] +0.32 %/yr
[2000-2005] -1.13 %/yr
[2005-2010] -0.97 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Greene County? Visit this page: Settlements in Greene County, IA
Population of Greene County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 229 | 263 | 492 |
| 5 to 9 | 292 | 278 | 570 |
| 10 to 14 | 336 | 295 | 631 |
| 15 to 19 | 311 | 282 | 593 |
| 20 to 24 | 255 | 238 | 493 |
| 25 to 29 | 214 | 194 | 408 |
| 30 to 34 | 251 | 224 | 475 |
| 35 to 39 | 235 | 231 | 466 |
| 40 to 44 | 241 | 239 | 480 |
| 45 to 49 | 275 | 252 | 527 |
| 50 to 54 | 353 | 369 | 722 |
| 55 to 59 | 354 | 374 | 728 |
| 60 to 64 | 325 | 322 | 647 |
| 65 to 69 | 259 | 265 | 524 |
| 70 to 74 | 187 | 217 | 404 |
| 75 to 79 | 157 | 202 | 359 |
| 80 to 84 | 104 | 181 | 285 |
| 85+ | 123 | 273 | 396 |
Greene 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 | 4429 | 4636 | 9,065 |
| WA | 4385 | 4577 | 8,962 |
| NH | 4349 | 4584 | 8,933 |
| NHWAC | 4285 | 4528 | 8,813 |
| NHWA | 4249 | 4477 | 8,726 |
| H | 152 | 115 | 267 |
| HWAC | 144 | 108 | 252 |
| HWA | 136 | 100 | 236 |
| TOM | 45 | 62 | 107 |
| BAC | 42 | 52 | 94 |
| NHTOM | 37 | 54 | 91 |
| IAC | 37 | 49 | 86 |
| NHBAC | 35 | 42 | 77 |
| NHIAC | 31 | 43 | 74 |
| AAC | 36 | 27 | 63 |
| NHAAC | 33 | 27 | 60 |
| BA | 29 | 23 | 52 |
| NHBA | 25 | 18 | 43 |
| NHAA | 22 | 19 | 41 |
| AA | 22 | 19 | 41 |
| IA | 17 | 18 | 35 |
| NHIA | 14 | 16 | 30 |
| HBAC | 7 | 10 | 17 |
| HTOM | 8 | 8 | 16 |
| HIAC | 6 | 6 | 12 |
| NAC | 7 | 2 | 9 |
| HBA | 4 | 5 | 9 |
| NHNAC | 5 | 2 | 7 |
| HIA | 3 | 2 | 5 |
| NA | 3 | 0 | 3 |
| HAAC | 3 | 0 | 3 |
| HNAC | 2 | 0 | 2 |
| NHNA | 2 | 0 | 2 |
| HNA | 1 | 0 | 1 |
| HAA | 0 | 0 | 0 |
• Story County population
47.3 mi, 
90°
• Dallas County
30.5 mi, 
144°
• Webster County
29.1 mi, 
21°
• Boone County
23.1 mi, 90°
• Carroll County
24.6 mi, 
269°
• Hamilton County
42.3 mi, 
55°
• Guthrie County
25.5 mi, 
193°
• Sac County
43.7 mi, 
303°
• Calhoun County
27.1 mi, 
331°
• Audubon County
36.5 mi, 
226°
[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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