Last official estimated population of Sumner County was 24,110 (year 2014)[1]. This was 0.008% of total US population and 0.8% of total Kansas state population. Area of Sumner County is 1,185.0 mi² (=3069 km²), in this year population density was 20.35 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Sumner County population in 2026 would be 24,044 [0].
Historical population of Sumner County for period 1870-2014 [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
[1870-1880] +98.42 %/yr
[1880-1890] +3.82 %/yr
[1890-1900] -1.65 %/yr
[1900-1910] +1.81 %/yr
[1910-1920] -0.48 %/yr
[1920-1930] -0.09 %/yr
[1930-1940] -1.01 %/yr
[1940-1950] -1.01 %/yr
[1950-1960] +0.68 %/yr
[1960-1970] -0.72 %/yr
[1970-1980] +0.57 %/yr
[1980-1990] +0.36 %/yr
[1990-2000] +0.04 %/yr
[2000-2005] -0.9 %/yr
[2005-2010] -0.54 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Sumner County? Visit this page: Settlements in Sumner County, KS
Population of Sumner County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 759 | 793 | 1,552 |
| 5 to 9 | 798 | 775 | 1,573 |
| 10 to 14 | 847 | 875 | 1,722 |
| 15 to 19 | 816 | 762 | 1,578 |
| 20 to 24 | 683 | 624 | 1,307 |
| 25 to 29 | 683 | 585 | 1,268 |
| 30 to 34 | 717 | 633 | 1,350 |
| 35 to 39 | 659 | 620 | 1,279 |
| 40 to 44 | 635 | 612 | 1,247 |
| 45 to 49 | 676 | 689 | 1,365 |
| 50 to 54 | 871 | 882 | 1,753 |
| 55 to 59 | 982 | 940 | 1,922 |
| 60 to 64 | 819 | 768 | 1,587 |
| 65 to 69 | 587 | 632 | 1,219 |
| 70 to 74 | 449 | 471 | 920 |
| 75 to 79 | 322 | 387 | 709 |
| 80 to 84 | 248 | 334 | 582 |
| 85+ | 189 | 406 | 595 |
Sumner 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 | 11430 | 11388 | 22,818 |
| NH | 11086 | 11207 | 22,293 |
| WA | 11143 | 11111 | 22,254 |
| NHWAC | 10824 | 10859 | 21,683 |
| NHWA | 10571 | 10618 | 21,189 |
| H | 654 | 581 | 1,235 |
| HWAC | 606 | 529 | 1,135 |
| HWA | 572 | 493 | 1,065 |
| IAC | 323 | 343 | 666 |
| TOM | 292 | 284 | 576 |
| NHIAC | 271 | 300 | 571 |
| NHTOM | 257 | 245 | 502 |
| BAC | 229 | 242 | 471 |
| NHBAC | 201 | 204 | 405 |
| BA | 149 | 153 | 302 |
| IA | 126 | 168 | 294 |
| NHBA | 131 | 130 | 261 |
| NHIA | 99 | 147 | 246 |
| AAC | 53 | 96 | 149 |
| NHAAC | 46 | 86 | 132 |
| HIAC | 52 | 43 | 95 |
| AA | 26 | 66 | 92 |
| NHAA | 24 | 61 | 85 |
| HTOM | 35 | 39 | 74 |
| HBAC | 28 | 38 | 66 |
| HIA | 27 | 21 | 48 |
| HBA | 18 | 23 | 41 |
| NAC | 7 | 12 | 19 |
| NHNAC | 7 | 11 | 18 |
| HAAC | 7 | 10 | 17 |
| NA | 4 | 6 | 10 |
| NHNA | 4 | 6 | 10 |
| HAA | 2 | 5 | 7 |
| HNAC | 0 | 1 | 1 |
| HNA | 0 | 0 | 0 |
• Sedgwick County population
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51.6 mi, 
44°
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34.9 mi, 
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• Cowley County
36.1 mi, 
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• Harvey County
56.3 mi, 3°
• Kingman County
41.9 mi, 
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• Harper County
31.7 mi, 
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• Alfalfa County
57.7 mi, 
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• Grant County
35 mi, 
207°
[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
*Cowley Kansas Notes
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