Last official estimated population of Shelby County was 6,367 (year 2014)[1]. This was 0.002% of total US population and 0.1% of total Missouri state population. Area of Shelby County is 502.3 mi² (=1301 km²), in this year population density was 12.68 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Shelby County population in 2026 would be 6,349 [0].
Historical population of Shelby 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] +3.36 %/yr
[1850-1860] +5.55 %/yr
[1860-1870] +3.32 %/yr
[1870-1880] +3.32 %/yr
[1880-1890] +1.1 %/yr
[1890-1900] +0.33 %/yr
[1900-1910] -0.84 %/yr
[1910-1920] -0.87 %/yr
[1920-1930] -1.27 %/yr
[1930-1940] -0.65 %/yr
[1940-1950] -1.42 %/yr
[1950-1960] -0.71 %/yr
[1960-1970] -1.36 %/yr
[1970-1980] -0.1 %/yr
[1980-1990] -1.19 %/yr
[1990-2000] -0.19 %/yr
[2000-2005] -0.37 %/yr
[2005-2010] -0.95 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Shelby County? Visit this page: Settlements in Shelby County, MO
Population of Shelby County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 206 | 146 | 352 |
| 5 to 9 | 225 | 201 | 426 |
| 10 to 14 | 208 | 195 | 403 |
| 15 to 19 | 185 | 180 | 365 |
| 20 to 24 | 133 | 160 | 293 |
| 25 to 29 | 139 | 155 | 294 |
| 30 to 34 | 181 | 181 | 362 |
| 35 to 39 | 192 | 158 | 350 |
| 40 to 44 | 154 | 157 | 311 |
| 45 to 49 | 150 | 170 | 320 |
| 50 to 54 | 265 | 216 | 481 |
| 55 to 59 | 232 | 230 | 462 |
| 60 to 64 | 223 | 210 | 433 |
| 65 to 69 | 169 | 175 | 344 |
| 70 to 74 | 149 | 158 | 307 |
| 75 to 79 | 92 | 128 | 220 |
| 80 to 84 | 63 | 95 | 158 |
| 85+ | 68 | 159 | 227 |
Shelby 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 | 2990 | 3035 | 6,025 |
| NH | 2981 | 3030 | 6,011 |
| WA | 2958 | 3010 | 5,968 |
| NHWAC | 2948 | 2994 | 5,942 |
| NHWA | 2917 | 2971 | 5,888 |
| H | 53 | 44 | 97 |
| HWAC | 42 | 41 | 83 |
| HWA | 41 | 39 | 80 |
| BAC | 42 | 35 | 77 |
| NHBAC | 40 | 33 | 73 |
| TOM | 32 | 26 | 58 |
| NHTOM | 31 | 24 | 55 |
| BA | 23 | 19 | 42 |
| NHBA | 22 | 18 | 40 |
| IAC | 20 | 17 | 37 |
| NHIAC | 17 | 15 | 32 |
| AAC | 7 | 13 | 20 |
| IA | 9 | 10 | 19 |
| NHAAC | 7 | 12 | 19 |
| NHIA | 6 | 8 | 14 |
| AA | 5 | 9 | 14 |
| NHAA | 5 | 9 | 14 |
| NAC | 8 | 1 | 9 |
| HNAC | 7 | 0 | 7 |
| HNA | 7 | 0 | 7 |
| NA | 7 | 0 | 7 |
| HIAC | 3 | 2 | 5 |
| HIA | 3 | 2 | 5 |
| HBAC | 2 | 2 | 4 |
| HTOM | 1 | 2 | 3 |
| NHNAC | 1 | 1 | 2 |
| HBA | 1 | 1 | 2 |
| HAAC | 0 | 1 | 1 |
| NHNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Marion County population
24.1 mi, 
88°
• Adair County
38.5 mi, 
314°
• Audrain County
42.4 mi, 
162°
• Randolph County
32.8 mi, 
220°
• Macon County
25.3 mi, 
275°
• Lewis County
27.5 mi, 
43°
• Ralls County
34.4 mi, 
119°
• Monroe County
21.1 mi, 
168°
• Scotland County
45 mi, 
356°
• Knox County
23.6 mi, 
352°
[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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