Last official estimated population of Dallas County was 66,652 (year 2014)[1]. This was 0.021% of total US population and 2.1% of total Iowa state population. Area of Dallas County is 591.7 mi² (=1532.5 km²), in this year population density was 112.65 p/mi². If population growth rate would be same as in period 2010-2014 (+0.19%/yr), Dallas County population in 2026 would be 68,227 [0].
Historical population of Dallas 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] +19.9 %/yr
[1860-1870] +8.65 %/yr
[1870-1880] +4.55 %/yr
[1880-1890] +0.89 %/yr
[1890-1900] +1.19 %/yr
[1900-1910] +0.24 %/yr
[1910-1920] +0.61 %/yr
[1920-1930] +0.15 %/yr
[1930-1940] -0.34 %/yr
[1940-1950] -0.41 %/yr
[1950-1960] +0.19 %/yr
[1960-1970] +0.79 %/yr
[1970-1980] +1.24 %/yr
[1980-1990] +0.08 %/yr
[1990-2000] +3.29 %/yr
[2000-2005] +5.23 %/yr
[2005-2010] +4.51 %/yr
[2010-2014] +0.19 %/yr
Looking for settlements in Dallas County? Visit this page: Settlements in Dallas County, IA
Population of Dallas County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 3112 | 3218 | 6,330 |
| 5 to 9 | 3265 | 3180 | 6,445 |
| 10 to 14 | 2999 | 3093 | 6,092 |
| 15 to 19 | 2469 | 2274 | 4,743 |
| 20 to 24 | 1634 | 1690 | 3,324 |
| 25 to 29 | 2560 | 2809 | 5,369 |
| 30 to 34 | 3255 | 3353 | 6,608 |
| 35 to 39 | 3177 | 2986 | 6,163 |
| 40 to 44 | 2890 | 2963 | 5,853 |
| 45 to 49 | 2602 | 2591 | 5,193 |
| 50 to 54 | 2384 | 2366 | 4,750 |
| 55 to 59 | 2047 | 2208 | 4,255 |
| 60 to 64 | 1710 | 1927 | 3,637 |
| 65 to 69 | 1402 | 1542 | 2,944 |
| 70 to 74 | 950 | 1023 | 1,973 |
| 75 to 79 | 676 | 839 | 1,515 |
| 80 to 84 | 411 | 615 | 1,026 |
| 85+ | 384 | 796 | 1,180 |
Dallas 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 | 35603 | 37179 | 72,782 |
| NH | 35428 | 37107 | 72,535 |
| WA | 35111 | 36653 | 71,764 |
| NHWAC | 33262 | 34956 | 68,218 |
| NHWA | 32829 | 34493 | 67,322 |
| H | 2499 | 2366 | 4,865 |
| HWAC | 2341 | 2223 | 4,564 |
| HWA | 2282 | 2160 | 4,442 |
| AAC | 1574 | 1608 | 3,182 |
| NHAAC | 1547 | 1582 | 3,129 |
| AA | 1390 | 1426 | 2,816 |
| NHAA | 1372 | 1412 | 2,784 |
| BAC | 935 | 910 | 1,845 |
| NHBAC | 881 | 838 | 1,719 |
| BA | 711 | 658 | 1,369 |
| NHBA | 681 | 614 | 1,295 |
| TOM | 526 | 555 | 1,081 |
| NHTOM | 460 | 485 | 945 |
| IAC | 313 | 304 | 617 |
| NHIAC | 176 | 194 | 370 |
| IA | 166 | 147 | 313 |
| HIAC | 137 | 110 | 247 |
| HIA | 97 | 68 | 165 |
| NHIA | 69 | 79 | 148 |
| HTOM | 66 | 70 | 136 |
| HBAC | 54 | 72 | 126 |
| NAC | 44 | 54 | 98 |
| HBA | 30 | 44 | 74 |
| NHNAC | 35 | 38 | 73 |
| NA | 23 | 34 | 57 |
| HAAC | 27 | 26 | 53 |
| NHNA | 17 | 24 | 41 |
| HAA | 18 | 14 | 32 |
| HNAC | 9 | 16 | 25 |
| HNA | 6 | 10 | 16 |
• Polk County population
24.3 mi, 
90°
• Story County
38.3 mi, 
50°
• Warren County
34.5 mi, 
134°
• Boone County
25 mi, 
12°
• Madison County
24.5 mi, 
176°
• Union County
46.6 mi, 
193°
• Guthrie County
23.8 mi, 
269°
• Greene County
30.5 mi, 
324°
• Adair County
33.5 mi, 
222°
• Audubon County
44.6 mi, 269°
[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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