Last official estimated population of Lyon County was 33,632 (year 2014)[1]. This was 0.011% of total US population and 1.2% of total Kansas state population. Area of Lyon County is 855.4 mi² (=2215.5 km²), in this year population density was 39.32 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Lyon County population in 2024 would be 33,487 [0].
Historical population of Lyon 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] +8.02 %/yr
[1880-1890] +2.96 %/yr
[1890-1900] +0.78 %/yr
[1900-1910] -0.06 %/yr
[1910-1920] +0.48 %/yr
[1920-1930] +1.12 %/yr
[1930-1940] -1.01 %/yr
[1940-1950] +0.06 %/yr
[1950-1960] +0.13 %/yr
[1960-1970] +1.76 %/yr
[1970-1980] +0.91 %/yr
[1980-1990] -0.11 %/yr
[1990-2000] +0.34 %/yr
[2000-2005] +0 %/yr
[2005-2010] -1.28 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Lyon County? Visit this page: Settlements in Lyon County, KS
Population of Lyon County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1006 | 1013 | 2,019 |
| 5 to 9 | 1093 | 1061 | 2,154 |
| 10 to 14 | 1068 | 1031 | 2,099 |
| 15 to 19 | 1249 | 1370 | 2,619 |
| 20 to 24 | 2029 | 2387 | 4,416 |
| 25 to 29 | 1171 | 1023 | 2,194 |
| 30 to 34 | 1026 | 977 | 2,003 |
| 35 to 39 | 845 | 842 | 1,687 |
| 40 to 44 | 873 | 803 | 1,676 |
| 45 to 49 | 861 | 871 | 1,732 |
| 50 to 54 | 1005 | 1050 | 2,055 |
| 55 to 59 | 1099 | 1063 | 2,162 |
| 60 to 64 | 926 | 919 | 1,845 |
| 65 to 69 | 708 | 698 | 1,406 |
| 70 to 74 | 470 | 588 | 1,058 |
| 75 to 79 | 319 | 405 | 724 |
| 80 to 84 | 241 | 391 | 632 |
| 85+ | 237 | 494 | 731 |
Lyon 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 | 15042 | 15838 | 30,880 |
| WA | 14701 | 15418 | 30,119 |
| NH | 12692 | 13649 | 26,341 |
| NHWAC | 11724 | 12762 | 24,486 |
| NHWA | 11460 | 12448 | 23,908 |
| H | 3534 | 3337 | 6,871 |
| HWAC | 3318 | 3076 | 6,394 |
| HWA | 3241 | 2970 | 6,211 |
| BAC | 641 | 648 | 1,289 |
| AAC | 527 | 527 | 1,054 |
| NHBAC | 543 | 501 | 1,044 |
| NHAAC | 486 | 472 | 958 |
| BA | 481 | 439 | 920 |
| AA | 456 | 450 | 906 |
| NHAA | 429 | 415 | 844 |
| TOM | 363 | 444 | 807 |
| IAC | 371 | 394 | 765 |
| NHBA | 411 | 346 | 757 |
| NHTOM | 280 | 329 | 609 |
| NHIAC | 222 | 227 | 449 |
| IA | 207 | 212 | 419 |
| HIAC | 149 | 167 | 316 |
| HBAC | 98 | 147 | 245 |
| HIA | 99 | 111 | 210 |
| NHIA | 108 | 101 | 209 |
| HTOM | 83 | 115 | 198 |
| HBA | 70 | 93 | 163 |
| HAAC | 41 | 55 | 96 |
| NAC | 27 | 43 | 70 |
| HAA | 27 | 35 | 62 |
| NA | 18 | 23 | 41 |
| HNAC | 18 | 18 | 36 |
| NHNAC | 9 | 25 | 34 |
| HNA | 14 | 13 | 27 |
| NHNA | 4 | 10 | 14 |
• Shawnee County population
46 mi, 
28°
• Geary County
49.9 mi, 
319°
• Franklin County
48.2 mi, 
81°
• Osage County
27.9 mi, 
61°
• Coffey County
27.9 mi, 
122°
• Wabaunsee County
34.6 mi, 
356°
• Greenwood County
40 mi, 
186°
• Morris County
31 mi, 
301°
• Woodson County
44.9 mi, 
150°
• Chase County
25.8 mi, 
245°
[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
*Breckinridge, Madison Kansas Notes
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