Last official estimated population of Riley County was 71,612 (year 2014)[1]. This was 0.022% of total US population and 2.5% of total Kansas state population. Area of Riley County is 622.0 mi² (=1610.9 km²), in this year population density was 115.14 p/mi². If population growth rate would be same as in period 2010-2014 (+0.17%/yr), Riley County population in 2026 would be 73,124 [0].
Historical population of Riley 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] +15.35 %/yr
[1870-1880] +7.41 %/yr
[1880-1890] +2.37 %/yr
[1890-1900] +0.48 %/yr
[1900-1910] +1.33 %/yr
[1910-1920] +2.72 %/yr
[1920-1930] -0.38 %/yr
[1930-1940] +0.36 %/yr
[1940-1950] +4.94 %/yr
[1950-1960] +2.3 %/yr
[1960-1970] +3.08 %/yr
[1970-1980] +1.12 %/yr
[1980-1990] +0.56 %/yr
[1990-2000] -0.64 %/yr
[2000-2005] +0.56 %/yr
[2005-2010] +1.89 %/yr
[2010-2014] +0.17 %/yr
Looking for settlements in Riley County? Visit this page: Settlements in Riley County, KS
Population of Riley County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 2799 | 2412 | 5,211 |
| 5 to 9 | 1829 | 1650 | 3,479 |
| 10 to 14 | 1480 | 1404 | 2,884 |
| 15 to 19 | 3653 | 3425 | 7,078 |
| 20 to 24 | 10963 | 8083 | 19,046 |
| 25 to 29 | 5098 | 3518 | 8,616 |
| 30 to 34 | 3080 | 2530 | 5,610 |
| 35 to 39 | 2056 | 1792 | 3,848 |
| 40 to 44 | 1410 | 1385 | 2,795 |
| 45 to 49 | 1170 | 1181 | 2,351 |
| 50 to 54 | 1337 | 1424 | 2,761 |
| 55 to 59 | 1383 | 1553 | 2,936 |
| 60 to 64 | 1290 | 1325 | 2,615 |
| 65 to 69 | 935 | 1007 | 1,942 |
| 70 to 74 | 600 | 682 | 1,282 |
| 75 to 79 | 408 | 500 | 908 |
| 80 to 84 | 310 | 481 | 791 |
| 85+ | 380 | 661 | 1,041 |
Riley 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 | 36740 | 32346 | 69,086 |
| WAC | 34776 | 30640 | 65,416 |
| WA | 33576 | 29592 | 63,168 |
| NHWAC | 31726 | 28276 | 60,002 |
| NHWA | 30664 | 27335 | 57,999 |
| BAC | 3717 | 2647 | 6,364 |
| H | 3441 | 2667 | 6,108 |
| NHBAC | 3453 | 2425 | 5,878 |
| HWAC | 3050 | 2364 | 5,414 |
| BA | 3089 | 2133 | 5,222 |
| HWA | 2912 | 2257 | 5,169 |
| NHBA | 2899 | 1973 | 4,872 |
| AAC | 2264 | 2194 | 4,458 |
| NHAAC | 2170 | 2141 | 4,311 |
| AA | 1819 | 1793 | 3,612 |
| NHAA | 1766 | 1763 | 3,529 |
| TOM | 1306 | 1131 | 2,437 |
| NHTOM | 1144 | 1008 | 2,152 |
| IAC | 645 | 598 | 1,243 |
| NHIAC | 476 | 469 | 945 |
| IA | 288 | 282 | 570 |
| HBAC | 264 | 222 | 486 |
| NHIA | 188 | 205 | 393 |
| HBA | 190 | 160 | 350 |
| HIAC | 169 | 129 | 298 |
| NAC | 161 | 135 | 296 |
| HTOM | 162 | 123 | 285 |
| NHNAC | 124 | 107 | 231 |
| NA | 103 | 82 | 185 |
| HIA | 100 | 77 | 177 |
| HAAC | 94 | 53 | 147 |
| NHNA | 79 | 62 | 141 |
| HAA | 53 | 30 | 83 |
| HNAC | 37 | 28 | 65 |
| HNA | 24 | 20 | 44 |
• Geary County population
20.1 mi,
186°
• Pottawatomie County
21.8 mi,
73°
• Dickinson County
37.3 mi,
218°
• Jackson County
50.5 mi,
80°
• Marshall County
35.7 mi,
17°
• Cloud County
50.6 mi,
285°
• Clay County
23.9 mi,
278°
• Wabaunsee County
36.5 mi,
129°
• Morris County
41.9 mi,
174°
• Washington County
38.9 mi,
329°
[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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