Last official estimated population of Seward County was 22,985 (year 2014)[1]. This was 0.007% of total US population and 0.8% of total Kansas state population. Area of Seward County is 640.4 mi² (=1658.6 km²), in this year population density was 35.89 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Seward County population in 2026 would be 23,084 [0].
Historical population of Seward County for period 1880-2014 [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

[1880-1890] +76.93 %/yr
[1890-1900] -5.86 %/yr
[1900-1910] +17.41 %/yr
[1910-1920] +4.28 %/yr
[1920-1930] +2.64 %/yr
[1930-1940] -2.09 %/yr
[1940-1950] +4.31 %/yr
[1950-1960] +4.8 %/yr
[1960-1970] -0.12 %/yr
[1970-1980] +0.81 %/yr
[1980-1990] +0.94 %/yr
[1990-2000] +1.85 %/yr
[2000-2005] -0.16 %/yr
[2005-2010] +0.55 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Seward County? Visit this page: Settlements in Seward County, KS
Population of Seward County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1181 | 1126 | 2,307 |
| 5 to 9 | 1118 | 1012 | 2,130 |
| 10 to 14 | 940 | 927 | 1,867 |
| 15 to 19 | 967 | 868 | 1,835 |
| 20 to 24 | 1090 | 847 | 1,937 |
| 25 to 29 | 950 | 889 | 1,839 |
| 30 to 34 | 881 | 783 | 1,664 |
| 35 to 39 | 757 | 683 | 1,440 |
| 40 to 44 | 751 | 694 | 1,445 |
| 45 to 49 | 754 | 675 | 1,429 |
| 50 to 54 | 712 | 667 | 1,379 |
| 55 to 59 | 622 | 563 | 1,185 |
| 60 to 64 | 469 | 464 | 933 |
| 65 to 69 | 330 | 335 | 665 |
| 70 to 74 | 234 | 249 | 483 |
| 75 to 79 | 145 | 203 | 348 |
| 80 to 84 | 102 | 191 | 293 |
| 85+ | 73 | 213 | 286 |
Seward 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 | 10948 | 10373 | 21,321 |
| WA | 10723 | 10174 | 20,897 |
| H | 7295 | 6569 | 13,864 |
| HWAC | 7013 | 6301 | 13,314 |
| HWA | 6948 | 6236 | 13,184 |
| NH | 4781 | 4820 | 9,601 |
| NHWAC | 3935 | 4072 | 8,007 |
| NHWA | 3775 | 3938 | 7,713 |
| BAC | 655 | 540 | 1,195 |
| BA | 543 | 452 | 995 |
| NHBAC | 516 | 415 | 931 |
| NHBA | 434 | 354 | 788 |
| AAC | 397 | 378 | 775 |
| NHAAC | 367 | 348 | 715 |
| AA | 362 | 351 | 713 |
| NHAA | 342 | 329 | 671 |
| IAC | 289 | 300 | 589 |
| TOM | 240 | 209 | 449 |
| IA | 174 | 188 | 362 |
| HIAC | 178 | 183 | 361 |
| NHTOM | 170 | 139 | 309 |
| HIA | 138 | 138 | 276 |
| HBAC | 139 | 125 | 264 |
| NHIAC | 111 | 117 | 228 |
| HBA | 109 | 98 | 207 |
| HTOM | 70 | 70 | 140 |
| NHIA | 36 | 50 | 86 |
| NAC | 41 | 20 | 61 |
| HAAC | 30 | 30 | 60 |
| NA | 34 | 15 | 49 |
| HAA | 20 | 22 | 42 |
| NHNAC | 28 | 13 | 41 |
| NHNA | 24 | 10 | 34 |
| HNAC | 13 | 7 | 20 |
| HNA | 10 | 5 | 15 |
• Texas County population
45.9 mi,
229°
• Grant County
35.2 mi,
316°
• Gray County
44.8 mi,
29°
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25.5 mi,
273°
• Beaver County
36.2 mi,
145°
• Meade County
27.6 mi,
80°
• Haskell County
25.9 mi,
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• Morton County
52.5 mi,
270°
• Stanton County
57.8 mi,
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• Clark County
57.4 mi,
86°
[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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