Last official estimated population of Roosevelt County was 10,438 (year 2014)[1]. This was 0.003% of total US population and 1% of total Montana state population. Area of Roosevelt County is 2,369.0 mi² (=6135.8 km²), in this year population density was 4.41 p/mi². If population growth rate would be same as in period 2010-2014 (+0.03%/yr), Roosevelt County population in 2026 would be 10,477 [0].
Historical population of Roosevelt County for period 1920-2014 [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
[1920-1930] +0.31 %/yr
[1930-1940] -0.84 %/yr
[1940-1950] -0.23 %/yr
[1950-1960] +2.05 %/yr
[1960-1970] -1.23 %/yr
[1970-1980] +0.1 %/yr
[1980-1990] +0.5 %/yr
[1990-2000] -0.34 %/yr
[2000-2005] -0.37 %/yr
[2005-2010] -0.02 %/yr
[2010-2014] +0.03 %/yr
Looking for settlements in Roosevelt County? Visit this page: Settlements in Roosevelt County, MT
Population of Roosevelt County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 602 | 496 | 1,098 |
| 5 to 9 | 554 | 542 | 1,096 |
| 10 to 14 | 442 | 477 | 919 |
| 15 to 19 | 424 | 363 | 787 |
| 20 to 24 | 443 | 409 | 852 |
| 25 to 29 | 430 | 390 | 820 |
| 30 to 34 | 337 | 360 | 697 |
| 35 to 39 | 338 | 295 | 633 |
| 40 to 44 | 286 | 295 | 581 |
| 45 to 49 | 292 | 272 | 564 |
| 50 to 54 | 381 | 361 | 742 |
| 55 to 59 | 346 | 406 | 752 |
| 60 to 64 | 311 | 292 | 603 |
| 65 to 69 | 181 | 205 | 386 |
| 70 to 74 | 140 | 156 | 296 |
| 75 to 79 | 80 | 106 | 186 |
| 80 to 84 | 67 | 89 | 156 |
| 85+ | 44 | 120 | 164 |
Roosevelt 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 | 5514 | 5533 | 11,047 |
| IAC | 3432 | 3443 | 6,875 |
| NHIAC | 3311 | 3376 | 6,687 |
| IA | 3280 | 3289 | 6,569 |
| NHIA | 3162 | 3227 | 6,389 |
| WAC | 2364 | 2312 | 4,676 |
| NHWAC | 2302 | 2273 | 4,575 |
| WA | 2184 | 2129 | 4,313 |
| NHWA | 2127 | 2096 | 4,223 |
| TOM | 185 | 184 | 369 |
| NHTOM | 178 | 178 | 356 |
| H | 184 | 101 | 285 |
| HIAC | 121 | 67 | 188 |
| HIA | 118 | 62 | 180 |
| HWAC | 62 | 39 | 101 |
| HWA | 57 | 33 | 90 |
| AAC | 46 | 41 | 87 |
| NHAAC | 42 | 41 | 83 |
| BAC | 40 | 22 | 62 |
| NHBAC | 38 | 20 | 58 |
| AA | 26 | 23 | 49 |
| NHAA | 25 | 23 | 48 |
| BA | 21 | 8 | 29 |
| NHBA | 20 | 8 | 28 |
| HTOM | 7 | 6 | 13 |
| NAC | 6 | 4 | 10 |
| NHNAC | 4 | 4 | 8 |
| HAAC | 4 | 0 | 4 |
| HBAC | 2 | 2 | 4 |
| NA | 2 | 1 | 3 |
| NHNA | 2 | 1 | 3 |
| HNAC | 2 | 0 | 2 |
| HBA | 1 | 0 | 1 |
| HAA | 1 | 0 | 1 |
| HNA | 0 | 0 | 0 |
• Williams County population
68.8 mi, 
85°
• Richland County
39.7 mi, 
149°
• Dawson County
69.9 mi, 
176°
• Valley County
77.1 mi, 
273°
• McKenzie County
82.5 mi, 
116°
• Sheridan County
36 mi, 
35°
• Divide County
77.3 mi, 
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• Daniels County
43.3 mi, 
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• McCone County
57.3 mi, 
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• Wibaux County
97.2 mi, 
159°
[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
*Valley Montana Notes
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