Last official estimated population of Atchison County was 5,659 (year 2014)[1]. This was 0.002% of total US population and 0.1% of total Missouri state population. Area of Atchison County is 550.1 mi² (=1424.8 km²), in this year population density was 10.29 p/mi². If population growth rate would be same as in period 2010-2014 (-0.11%/yr), Atchison County population in 2026 would be 5,582 [0].
Historical population of Atchison County for period 1850-2014 [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
[1850-1860] +10.73 %/yr
[1860-1870] +6.14 %/yr
[1870-1880] +5.6 %/yr
[1880-1890] +0.65 %/yr
[1890-1900] +0.61 %/yr
[1900-1910] -1.91 %/yr
[1910-1920] -0.45 %/yr
[1920-1930] +0.31 %/yr
[1930-1940] -0.4 %/yr
[1940-1950] -1.47 %/yr
[1950-1960] -1.87 %/yr
[1960-1970] +0.03 %/yr
[1970-1980] -0.71 %/yr
[1980-1990] -1.42 %/yr
[1990-2000] -1.48 %/yr
[2000-2005] -1.18 %/yr
[2005-2010] -1.25 %/yr
[2010-2014] -0.11 %/yr
Looking for settlements in Atchison County? Visit this page: Settlements in Atchison County, MO
Population of Atchison County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 161 | 134 | 295 |
| 5 to 9 | 141 | 144 | 285 |
| 10 to 14 | 162 | 159 | 321 |
| 15 to 19 | 141 | 147 | 288 |
| 20 to 24 | 142 | 131 | 273 |
| 25 to 29 | 118 | 132 | 250 |
| 30 to 34 | 148 | 131 | 279 |
| 35 to 39 | 140 | 120 | 260 |
| 40 to 44 | 153 | 166 | 319 |
| 45 to 49 | 169 | 176 | 345 |
| 50 to 54 | 217 | 181 | 398 |
| 55 to 59 | 204 | 201 | 405 |
| 60 to 64 | 195 | 188 | 383 |
| 65 to 69 | 199 | 195 | 394 |
| 70 to 74 | 164 | 162 | 326 |
| 75 to 79 | 96 | 101 | 197 |
| 80 to 84 | 62 | 100 | 162 |
| 85+ | 57 | 145 | 202 |
Atchison 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 | 2641 | 2681 | 5,322 |
| NH | 2636 | 2677 | 5,313 |
| WA | 2615 | 2654 | 5,269 |
| NHWAC | 2613 | 2646 | 5,259 |
| NHWA | 2587 | 2624 | 5,211 |
| H | 33 | 36 | 69 |
| HWAC | 28 | 35 | 63 |
| HWA | 28 | 30 | 58 |
| TOM | 27 | 28 | 55 |
| NHTOM | 27 | 23 | 50 |
| IAC | 24 | 24 | 48 |
| BAC | 23 | 24 | 47 |
| NHBAC | 23 | 21 | 44 |
| NHIAC | 19 | 20 | 39 |
| NHBA | 12 | 11 | 23 |
| BA | 12 | 11 | 23 |
| IA | 12 | 10 | 22 |
| NHAAC | 6 | 11 | 17 |
| AAC | 6 | 11 | 17 |
| NHIA | 7 | 9 | 16 |
| AA | 2 | 8 | 10 |
| NHAA | 2 | 8 | 10 |
| HIAC | 5 | 4 | 9 |
| HIA | 5 | 1 | 6 |
| HTOM | 0 | 5 | 5 |
| NAC | 2 | 2 | 4 |
| NHNAC | 2 | 2 | 4 |
| NA | 1 | 2 | 3 |
| NHNA | 1 | 2 | 3 |
| HBAC | 0 | 3 | 3 |
| HNAC | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Nodaway County population
29.6 mi, 
99°
• Page County
26.2 mi, 
35°
• Otoe County
39.1 mi, 
291°
• Mills County
42.7 mi, 
347°
• Montgomery County
43.3 mi, 
19°
• Brown County
42.4 mi, 
189°
• Richardson County
25.9 mi, 
214°
• Fremont County
23.1 mi, 
338°
• Nemaha County
22.1 mi, 
261°
• Holt County
25.9 mi, 
153°
[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
*Buchanan Missouri Notes
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