Last official estimated population of Webster County was 37,865 (year 2014)[1]. This was 0.012% of total US population and 1.2% of total Iowa state population. Area of Webster County is 718.4 mi² (=1860.7 km²), in this year population density was 52.71 p/mi². If population growth rate would be same as in period 2010-2014 (-0.1%/yr), Webster County population in 2026 would be 37,424 [0].
Historical population of Webster 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] +15.4 %/yr
[1870-1880] +4.29 %/yr
[1880-1890] +3.07 %/yr
[1890-1900] +3.94 %/yr
[1900-1910] +0.87 %/yr
[1910-1920] +0.83 %/yr
[1920-1930] +0.72 %/yr
[1930-1940] +0.27 %/yr
[1940-1950] +0.64 %/yr
[1950-1960] +0.78 %/yr
[1960-1970] +0.12 %/yr
[1970-1980] -0.52 %/yr
[1980-1990] -1.29 %/yr
[1990-2000] -0.03 %/yr
[2000-2005] -0.84 %/yr
[2005-2010] -0.29 %/yr
[2010-2014] -0.1 %/yr
Looking for settlements in Webster County? Visit this page: Settlements in Webster County, IA
Population of Webster County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1110 | 1033 | 2,143 |
| 5 to 9 | 1102 | 1022 | 2,124 |
| 10 to 14 | 1211 | 1037 | 2,248 |
| 15 to 19 | 1545 | 1208 | 2,753 |
| 20 to 24 | 1817 | 1129 | 2,946 |
| 25 to 29 | 1346 | 933 | 2,279 |
| 30 to 34 | 1211 | 1017 | 2,228 |
| 35 to 39 | 1006 | 922 | 1,928 |
| 40 to 44 | 961 | 935 | 1,896 |
| 45 to 49 | 1128 | 999 | 2,127 |
| 50 to 54 | 1330 | 1325 | 2,655 |
| 55 to 59 | 1417 | 1398 | 2,815 |
| 60 to 64 | 1189 | 1253 | 2,442 |
| 65 to 69 | 894 | 985 | 1,879 |
| 70 to 74 | 640 | 736 | 1,376 |
| 75 to 79 | 506 | 648 | 1,154 |
| 80 to 84 | 411 | 563 | 974 |
| 85+ | 337 | 651 | 988 |
Webster 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 | 18278 | 17071 | 35,349 |
| WAC | 17802 | 17068 | 34,870 |
| WA | 17474 | 16771 | 34,245 |
| NHWAC | 16987 | 16400 | 33,387 |
| NHWA | 16690 | 16128 | 32,818 |
| BAC | 1323 | 689 | 2,012 |
| NHBAC | 1273 | 653 | 1,926 |
| H | 883 | 723 | 1,606 |
| BA | 1083 | 484 | 1,567 |
| NHBA | 1052 | 460 | 1,512 |
| HWAC | 815 | 668 | 1,483 |
| HWA | 784 | 643 | 1,427 |
| TOM | 343 | 305 | 648 |
| NHTOM | 309 | 280 | 589 |
| AAC | 218 | 229 | 447 |
| NHAAC | 205 | 220 | 425 |
| AA | 163 | 177 | 340 |
| NHAA | 157 | 169 | 326 |
| IAC | 164 | 117 | 281 |
| NHIAC | 127 | 80 | 207 |
| IA | 89 | 52 | 141 |
| NHIA | 66 | 29 | 95 |
| HBAC | 50 | 36 | 86 |
| HIAC | 37 | 37 | 74 |
| HTOM | 34 | 25 | 59 |
| HBA | 31 | 24 | 55 |
| HIA | 23 | 23 | 46 |
| NAC | 17 | 15 | 32 |
| NHNAC | 12 | 14 | 26 |
| HAAC | 13 | 9 | 22 |
| NA | 9 | 5 | 14 |
| HAA | 6 | 8 | 14 |
| NHNA | 4 | 5 | 9 |
| HNAC | 5 | 1 | 6 |
| HNA | 5 | 0 | 5 |
• Story County population
45.5 mi, 
127°
• Boone County
29.9 mi, 
156°
• Carroll County
44.7 mi, 
232°
• Hamilton County
24 mi, 
97°
• Wright County
30.5 mi, 
47°
• Sac County
47.5 mi, 
266°
• Calhoun County
24.1 mi, 
262°
• Humboldt County
24.1 mi, 
356°
• Greene County
29.1 mi, 
201°
• Pocahontas County
32.9 mi, 
309°
[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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