Last official estimated population of Lyon County was 8,319 (year 2014)[1]. This was 0.003% of total US population and 0.2% of total Kentucky state population. Area of Lyon County is 256.5 mi² (=664.4 km²), in this year population density was 32.43 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Lyon County population in 2026 would be 8,334 [0].
Historical population of Lyon 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] +1.62 %/yr
[1870-1880] +0.83 %/yr
[1880-1890] +1.2 %/yr
[1890-1900] +2.02 %/yr
[1900-1910] +0.11 %/yr
[1910-1920] -0.69 %/yr
[1920-1930] -0.31 %/yr
[1930-1940] +0.61 %/yr
[1940-1950] -2.76 %/yr
[1950-1960] -1.45 %/yr
[1960-1970] -0.63 %/yr
[1970-1980] +1.56 %/yr
[1980-1990] +0.2 %/yr
[1990-2000] +2.01 %/yr
[2000-2005] +0.6 %/yr
[2005-2010] -0.03 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Lyon County? Visit this page: Settlements in Lyon County, KY
Population of Lyon County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 164 | 171 | 335 |
| 5 to 9 | 193 | 152 | 345 |
| 10 to 14 | 183 | 178 | 361 |
| 15 to 19 | 191 | 186 | 377 |
| 20 to 24 | 271 | 166 | 437 |
| 25 to 29 | 331 | 128 | 459 |
| 30 to 34 | 351 | 160 | 511 |
| 35 to 39 | 335 | 155 | 490 |
| 40 to 44 | 356 | 188 | 544 |
| 45 to 49 | 336 | 226 | 562 |
| 50 to 54 | 361 | 312 | 673 |
| 55 to 59 | 340 | 345 | 685 |
| 60 to 64 | 343 | 334 | 677 |
| 65 to 69 | 327 | 354 | 681 |
| 70 to 74 | 262 | 263 | 525 |
| 75 to 79 | 187 | 173 | 360 |
| 80 to 84 | 90 | 125 | 215 |
| 85+ | 68 | 125 | 193 |
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 |
| NH | 4605 | 3694 | 8,299 |
| WAC | 4248 | 3655 | 7,903 |
| WA | 4189 | 3608 | 7,797 |
| NHWAC | 4168 | 3610 | 7,778 |
| NHWA | 4109 | 3563 | 7,672 |
| BAC | 452 | 74 | 526 |
| NHBAC | 450 | 72 | 522 |
| BA | 420 | 58 | 478 |
| NHBA | 418 | 56 | 474 |
| H | 84 | 47 | 131 |
| HWA | 80 | 45 | 125 |
| HWAC | 80 | 45 | 125 |
| TOM | 63 | 47 | 110 |
| NHTOM | 63 | 47 | 110 |
| IAC | 33 | 39 | 72 |
| NHIAC | 31 | 39 | 70 |
| AAC | 21 | 19 | 40 |
| NHAAC | 21 | 19 | 40 |
| AA | 10 | 15 | 25 |
| NHAA | 10 | 15 | 25 |
| IA | 7 | 13 | 20 |
| NHIA | 5 | 13 | 18 |
| NHNAC | 5 | 1 | 6 |
| NAC | 5 | 1 | 6 |
| HBAC | 2 | 2 | 4 |
| HBA | 2 | 2 | 4 |
| HIAC | 2 | 0 | 2 |
| HIA | 2 | 0 | 2 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HTOM | 0 | 0 | 0 |
• Christian County population
33.8 mi, 
105°
• McCracken County
34.7 mi, 
273°
• Hopkins County
35.8 mi, 
56°
• Calloway County
29.8 mi, 
200°
• Marshall County
16.9 mi, 
234°
• Trigg County
19.4 mi, 
140°
• Caldwell County
14.6 mi, 
53°
• Livingston County
20.1 mi, 
309°
• Crittenden County
23.1 mi, 
357°
• Hardin County
35.6 mi, 
343°
[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
*Caldwell Kentucky Notes
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