Last official estimated population of Dewey County was 4,818 (year 2014)[1]. This was 0.002% of total US population and 0.1% of total Oklahoma state population. Area of Dewey County is 1,008.2 mi² (=2611.3 km²), in this year population density was 4.78 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Dewey County population in 2026 would be 4,842 [0].
Historical population of Dewey County for period 1880-2014 [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
[1880-1890] +INF %/yr
[1890-1900] +4.22 %/yr
[1900-1910] +0.59 %/yr
[1910-1920] -1.27 %/yr
[1920-1930] +0.64 %/yr
[1930-1940] -1 %/yr
[1940-1950] -3.05 %/yr
[1950-1960] -3.66 %/yr
[1960-1970] -0.67 %/yr
[1970-1980] +0.46 %/yr
[1980-1990] -0.64 %/yr
[1990-2000] -1.57 %/yr
[2000-2005] -0.55 %/yr
[2005-2010] +0.85 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Dewey County? Visit this page: Settlements in Dewey County, OK
Population of Dewey County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 170 | 162 | 332 |
| 5 to 9 | 173 | 188 | 361 |
| 10 to 14 | 175 | 192 | 367 |
| 15 to 19 | 173 | 159 | 332 |
| 20 to 24 | 142 | 127 | 269 |
| 25 to 29 | 131 | 118 | 249 |
| 30 to 34 | 138 | 146 | 284 |
| 35 to 39 | 142 | 129 | 271 |
| 40 to 44 | 115 | 123 | 238 |
| 45 to 49 | 151 | 134 | 285 |
| 50 to 54 | 167 | 163 | 330 |
| 55 to 59 | 170 | 198 | 368 |
| 60 to 64 | 140 | 136 | 276 |
| 65 to 69 | 133 | 140 | 273 |
| 70 to 74 | 121 | 136 | 257 |
| 75 to 79 | 88 | 108 | 196 |
| 80 to 84 | 47 | 52 | 99 |
| 85+ | 33 | 94 | 127 |
Dewey 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 | 2243 | 2372 | 4,615 |
| WAC | 2214 | 2328 | 4,542 |
| WA | 2151 | 2218 | 4,369 |
| NHWAC | 2063 | 2211 | 4,274 |
| NHWA | 2011 | 2123 | 4,134 |
| IAC | 196 | 216 | 412 |
| NHIAC | 175 | 183 | 358 |
| H | 166 | 133 | 299 |
| IA | 154 | 136 | 290 |
| HWAC | 151 | 117 | 268 |
| NHIA | 140 | 122 | 262 |
| HWA | 140 | 95 | 235 |
| TOM | 68 | 117 | 185 |
| NHTOM | 57 | 94 | 151 |
| BAC | 37 | 53 | 90 |
| NHBAC | 34 | 44 | 78 |
| AAC | 26 | 31 | 57 |
| NHAAC | 26 | 30 | 56 |
| HIAC | 21 | 33 | 54 |
| NHAA | 23 | 22 | 45 |
| AA | 23 | 22 | 45 |
| HTOM | 11 | 23 | 34 |
| HIA | 14 | 14 | 28 |
| BA | 12 | 12 | 24 |
| NHBA | 12 | 11 | 23 |
| HBAC | 3 | 9 | 12 |
| NAC | 6 | 0 | 6 |
| NHNAC | 4 | 0 | 4 |
| HNAC | 2 | 0 | 2 |
| HNA | 1 | 0 | 1 |
| NA | 1 | 0 | 1 |
| HAAC | 0 | 1 | 1 |
| HBA | 0 | 1 | 1 |
| NHNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Custer County population
23 mi, 
177°
• Beckham County
61.9 mi, 
217°
• Woodward County
34.1 mi, 
334°
• Kingfisher County
60.4 mi, 
91°
• Washita County
47.6 mi, 178°
• Blaine County
33.5 mi, 
101°
• Woods County
52.4 mi, 
9°
• Major County
35.1 mi, 
48°
• Ellis County
44.5 mi, 
292°
• Roger Mills County
44.8 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
*Cheyenne and Arapaho Reservation Oklahoma Notes
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