Last official estimated population of Story County was 89,596 (year 2014)[1]. This was 0.028% of total US population and 2.9% of total Iowa state population. Area of Story County is 573.6 mi² (=1485.7 km²), in this year population density was 156.19 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Story County population in 2026 would be 89,758 [0].
Historical population of Story 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] +11.14 %/yr
[1870-1880] +3.79 %/yr
[1880-1890] +0.7 %/yr
[1890-1900] +2.48 %/yr
[1900-1910] +0.39 %/yr
[1910-1920] +0.84 %/yr
[1920-1930] +1.75 %/yr
[1930-1940] +0.71 %/yr
[1940-1950] +2.85 %/yr
[1950-1960] +1.08 %/yr
[1960-1970] +2.44 %/yr
[1970-1980] +1.43 %/yr
[1980-1990] +0.26 %/yr
[1990-2000] +0.75 %/yr
[2000-2005] +0.71 %/yr
[2005-2010] +1.56 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Story County? Visit this page: Settlements in Story County, IA
Population of Story County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 2363 | 2211 | 4,574 |
| 5 to 9 | 2319 | 2228 | 4,547 |
| 10 to 14 | 2312 | 2106 | 4,418 |
| 15 to 19 | 5568 | 5156 | 10,724 |
| 20 to 24 | 11661 | 9014 | 20,675 |
| 25 to 29 | 3909 | 3054 | 6,963 |
| 30 to 34 | 2895 | 2625 | 5,520 |
| 35 to 39 | 2468 | 2217 | 4,685 |
| 40 to 44 | 2154 | 1920 | 4,074 |
| 45 to 49 | 2095 | 2075 | 4,170 |
| 50 to 54 | 2173 | 2321 | 4,494 |
| 55 to 59 | 2298 | 2388 | 4,686 |
| 60 to 64 | 2194 | 2291 | 4,485 |
| 65 to 69 | 1502 | 1540 | 3,042 |
| 70 to 74 | 1079 | 1219 | 2,298 |
| 75 to 79 | 805 | 977 | 1,782 |
| 80 to 84 | 537 | 767 | 1,304 |
| 85+ | 534 | 1098 | 1,632 |
Story 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 | 47258 | 43859 | 91,117 |
| WAC | 43524 | 40913 | 84,437 |
| WA | 42731 | 40231 | 82,962 |
| NHWAC | 42056 | 39699 | 81,755 |
| NHWA | 41367 | 39108 | 80,475 |
| AAC | 4002 | 3261 | 7,263 |
| NHAAC | 3958 | 3210 | 7,168 |
| AA | 3652 | 2955 | 6,607 |
| NHAA | 3639 | 2934 | 6,573 |
| BAC | 1863 | 1454 | 3,317 |
| NHBAC | 1736 | 1338 | 3,074 |
| H | 1608 | 1348 | 2,956 |
| HWAC | 1468 | 1214 | 2,682 |
| BA | 1516 | 1152 | 2,668 |
| NHBA | 1443 | 1083 | 2,526 |
| HWA | 1364 | 1123 | 2,487 |
| TOM | 834 | 728 | 1,562 |
| NHTOM | 719 | 622 | 1,341 |
| IAC | 359 | 327 | 686 |
| NHIAC | 249 | 238 | 487 |
| IA | 124 | 124 | 248 |
| HBAC | 127 | 116 | 243 |
| HTOM | 115 | 106 | 221 |
| HIAC | 110 | 89 | 199 |
| NHIA | 83 | 96 | 179 |
| HBA | 73 | 69 | 142 |
| HAAC | 44 | 51 | 95 |
| NAC | 39 | 45 | 84 |
| HIA | 41 | 28 | 69 |
| NHNAC | 29 | 38 | 67 |
| HAA | 13 | 21 | 34 |
| NA | 9 | 17 | 26 |
| NHNA | 7 | 16 | 23 |
| HNAC | 10 | 7 | 17 |
| HNA | 2 | 1 | 3 |
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[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
*Polk Iowa Notes
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