Last official estimated population of Decatur County was 8,415 (year 2014)[1]. This was 0.003% of total US population and 0.3% of total Iowa state population. Area of Decatur County is 533.5 mi² (=1381.7 km²), in this year population density was 15.77 p/mi². If population growth rate would be same as in period 2010-2014 (-0.12%/yr), Decatur County population in 2024 would be 8,311 [0].
Historical population of Decatur County for period 1850-2014 [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
[1850-1860] +24.56 %/yr
[1860-1870] +3.31 %/yr
[1870-1880] +2.47 %/yr
[1880-1890] +0.2 %/yr
[1890-1900] +1.48 %/yr
[1900-1910] -1.02 %/yr
[1910-1920] +0.13 %/yr
[1920-1930] -1.05 %/yr
[1930-1940] -0.61 %/yr
[1940-1950] -1.06 %/yr
[1950-1960] -1.77 %/yr
[1960-1970] -0.79 %/yr
[1970-1980] +0.06 %/yr
[1980-1990] -1.6 %/yr
[1990-2000] +0.41 %/yr
[2000-2005] -0.16 %/yr
[2005-2010] -0.38 %/yr
[2010-2014] -0.12 %/yr
Looking for settlements in Decatur County? Visit this page: Settlements in Decatur County, IA
Population of Decatur County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 209 | 210 | 419 |
| 5 to 9 | 281 | 255 | 536 |
| 10 to 14 | 271 | 256 | 527 |
| 15 to 19 | 410 | 379 | 789 |
| 20 to 24 | 554 | 434 | 988 |
| 25 to 29 | 193 | 188 | 381 |
| 30 to 34 | 195 | 198 | 393 |
| 35 to 39 | 180 | 191 | 371 |
| 40 to 44 | 207 | 196 | 403 |
| 45 to 49 | 201 | 186 | 387 |
| 50 to 54 | 248 | 256 | 504 |
| 55 to 59 | 260 | 274 | 534 |
| 60 to 64 | 265 | 253 | 518 |
| 65 to 69 | 214 | 210 | 424 |
| 70 to 74 | 151 | 179 | 330 |
| 75 to 79 | 124 | 164 | 288 |
| 80 to 84 | 114 | 132 | 246 |
| 85+ | 73 | 152 | 225 |
Decatur 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 | 4034 | 4011 | 8,045 |
| WAC | 3966 | 3998 | 7,964 |
| WA | 3920 | 3951 | 7,871 |
| NHWAC | 3860 | 3908 | 7,768 |
| NHWA | 3822 | 3866 | 7,688 |
| H | 116 | 102 | 218 |
| BAC | 131 | 68 | 199 |
| HWAC | 106 | 90 | 196 |
| NHBAC | 120 | 66 | 186 |
| HWA | 98 | 85 | 183 |
| BA | 113 | 50 | 163 |
| NHBA | 107 | 49 | 156 |
| AAC | 54 | 47 | 101 |
| TOM | 49 | 49 | 98 |
| NHAAC | 52 | 43 | 95 |
| NHTOM | 41 | 44 | 85 |
| IAC | 34 | 46 | 80 |
| AA | 35 | 36 | 71 |
| NHAA | 33 | 32 | 65 |
| NHIAC | 30 | 35 | 65 |
| IA | 16 | 25 | 41 |
| NHIA | 15 | 18 | 33 |
| NAC | 19 | 7 | 26 |
| NHNAC | 18 | 7 | 25 |
| NA | 17 | 2 | 19 |
| NHNA | 16 | 2 | 18 |
| HIAC | 4 | 11 | 15 |
| HBAC | 11 | 2 | 13 |
| HTOM | 8 | 5 | 13 |
| HIA | 1 | 7 | 8 |
| HBA | 6 | 1 | 7 |
| HAAC | 2 | 4 | 6 |
| HAA | 2 | 4 | 6 |
| HNAC | 1 | 0 | 1 |
| HNA | 1 | 0 | 1 |
• Warren County population
43 mi, 
15°
• Madison County
42.8 mi, 
343°
• Union County
31.4 mi, 
310°
• Clarke County
20.2 mi, 
0°
• Harrison County
29.1 mi, 
202°
• Lucas County
31.3 mi, 
49°
• Wayne County
23.7 mi, 
89°
• Ringgold County
24.1 mi, 
269°
• Mercer County
24.6 mi, 
152°
• Worth County
37.7 mi, 
241°
[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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