Last official estimated population of Lewis County was 10,200 (year 2014)[1]. This was 0.003% of total US population and 0.2% of total Missouri state population. Area of Lewis County is 510.8 mi² (=1323 km²), in this year population density was 19.97 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Lewis County population in 2026 would be 10,167 [0].
Historical population of Lewis County for period 1840-2014 [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
[1840-1850] +0.86 %/yr
[1850-1860] +6.45 %/yr
[1860-1870] +2.09 %/yr
[1870-1880] +0.52 %/yr
[1880-1890] +0.01 %/yr
[1890-1900] +0.48 %/yr
[1900-1910] -0.75 %/yr
[1910-1920] -1.41 %/yr
[1920-1930] -1.07 %/yr
[1930-1940] -0.51 %/yr
[1940-1950] -0.68 %/yr
[1950-1960] +0.23 %/yr
[1960-1970] +0.01 %/yr
[1970-1980] -0.08 %/yr
[1980-1990] -0.63 %/yr
[1990-2000] +0.25 %/yr
[2000-2005] -0.41 %/yr
[2005-2010] -0.12 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Lewis County? Visit this page: Settlements in Lewis County, MO
Population of Lewis County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 305 | 284 | 589 |
| 5 to 9 | 351 | 290 | 641 |
| 10 to 14 | 330 | 316 | 646 |
| 15 to 19 | 424 | 405 | 829 |
| 20 to 24 | 445 | 388 | 833 |
| 25 to 29 | 252 | 269 | 521 |
| 30 to 34 | 289 | 294 | 583 |
| 35 to 39 | 249 | 247 | 496 |
| 40 to 44 | 278 | 260 | 538 |
| 45 to 49 | 295 | 294 | 589 |
| 50 to 54 | 394 | 366 | 760 |
| 55 to 59 | 353 | 350 | 703 |
| 60 to 64 | 269 | 312 | 581 |
| 65 to 69 | 263 | 273 | 536 |
| 70 to 74 | 236 | 211 | 447 |
| 75 to 79 | 127 | 199 | 326 |
| 80 to 84 | 110 | 148 | 258 |
| 85+ | 98 | 164 | 262 |
Lewis 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 | 4984 | 4989 | 9,973 |
| WAC | 4843 | 4874 | 9,717 |
| NHWAC | 4773 | 4802 | 9,575 |
| WA | 4766 | 4780 | 9,546 |
| NHWA | 4696 | 4710 | 9,406 |
| BAC | 219 | 211 | 430 |
| NHBAC | 212 | 206 | 418 |
| BA | 178 | 152 | 330 |
| NHBA | 171 | 148 | 319 |
| TOM | 82 | 97 | 179 |
| NHTOM | 81 | 95 | 176 |
| H | 84 | 81 | 165 |
| HWAC | 70 | 72 | 142 |
| HWA | 70 | 70 | 140 |
| IAC | 46 | 51 | 97 |
| NHIAC | 42 | 47 | 89 |
| AAC | 34 | 26 | 60 |
| NHAAC | 30 | 24 | 54 |
| AA | 23 | 16 | 39 |
| IA | 16 | 19 | 35 |
| NHAA | 20 | 14 | 34 |
| NHIA | 13 | 16 | 29 |
| NHNAC | 10 | 10 | 20 |
| NAC | 10 | 10 | 20 |
| HBAC | 7 | 5 | 12 |
| HBA | 7 | 4 | 11 |
| NA | 3 | 6 | 9 |
| NHNA | 3 | 6 | 9 |
| HIAC | 4 | 4 | 8 |
| HAAC | 4 | 2 | 6 |
| HIA | 3 | 3 | 6 |
| HAA | 3 | 2 | 5 |
| HTOM | 1 | 2 | 3 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Adams County population
29 mi, 
103°
• Lee County
41.1 mi, 
18°
• Marion County
19.8 mi, 
165°
• Hancock County
37 mi, 
53°
• Ralls County
38.3 mi, 
163°
• Monroe County
43.1 mi, 
199°
• Clark County
22.3 mi, 
359°
• Shelby County
27.5 mi, 
223°
• Scotland County
33.3 mi, 
318°
• Knox County
22.4 mi, 
279°
[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
*Marion Missouri Notes
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