Last official estimated population of Sweet Grass County was 3,613 (year 2014)[1]. This was 0.001% of total US population and 0.3% of total Montana state population. Area of Sweet Grass County is 1,862.2 mi² (=4823.2 km²), in this year population density was 1.94 p/mi². If population growth rate would be same as in period 2010-2014 (-0.26%/yr), Sweet Grass County population in 2025 would be 3,511 [0].
Historical population of Sweet Grass County for period 1900-2014 [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
[1900-1910] +2.7 %/yr
[1910-1920] +2.03 %/yr
[1920-1930] -2.2 %/yr
[1930-1940] -0.59 %/yr
[1940-1950] -0.27 %/yr
[1950-1960] -0.95 %/yr
[1960-1970] -0.98 %/yr
[1970-1980] +0.77 %/yr
[1980-1990] -0.19 %/yr
[1990-2000] +1.33 %/yr
[2000-2005] +0.41 %/yr
[2005-2010] -0.13 %/yr
[2010-2014] -0.26 %/yr
Looking for settlements in Sweet Grass County? Visit this page: Settlements in Sweet Grass County, MT
Population of Sweet Grass County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 63 | 94 | 157 |
| 5 to 9 | 120 | 126 | 246 |
| 10 to 14 | 134 | 107 | 241 |
| 15 to 19 | 131 | 116 | 247 |
| 20 to 24 | 85 | 80 | 165 |
| 25 to 29 | 75 | 75 | 150 |
| 30 to 34 | 81 | 83 | 164 |
| 35 to 39 | 100 | 91 | 191 |
| 40 to 44 | 85 | 105 | 190 |
| 45 to 49 | 114 | 100 | 214 |
| 50 to 54 | 128 | 133 | 261 |
| 55 to 59 | 136 | 142 | 278 |
| 60 to 64 | 159 | 141 | 300 |
| 65 to 69 | 114 | 142 | 256 |
| 70 to 74 | 113 | 102 | 215 |
| 75 to 79 | 78 | 63 | 141 |
| 80 to 84 | 49 | 61 | 110 |
| 85+ | 50 | 89 | 139 |
Sweet Grass 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 | 1795 | 1819 | 3,614 |
| NH | 1785 | 1808 | 3,593 |
| NHWAC | 1766 | 1782 | 3,548 |
| WA | 1765 | 1781 | 3,546 |
| NHWA | 1738 | 1749 | 3,487 |
| H | 30 | 42 | 72 |
| TOM | 30 | 39 | 69 |
| IAC | 30 | 37 | 67 |
| HWAC | 29 | 37 | 66 |
| NHTOM | 28 | 34 | 62 |
| NHIAC | 28 | 31 | 59 |
| HWA | 27 | 32 | 59 |
| AAC | 10 | 21 | 31 |
| NHAAC | 10 | 18 | 28 |
| IA | 10 | 15 | 25 |
| NHIA | 9 | 12 | 21 |
| AA | 7 | 13 | 20 |
| BAC | 10 | 9 | 19 |
| NHAA | 7 | 11 | 18 |
| NHBAC | 9 | 8 | 17 |
| HIAC | 2 | 6 | 8 |
| HTOM | 2 | 5 | 7 |
| NHBA | 3 | 1 | 4 |
| BA | 3 | 1 | 4 |
| NAC | 1 | 3 | 4 |
| HIA | 1 | 3 | 4 |
| NHNAC | 1 | 3 | 4 |
| HAAC | 0 | 3 | 3 |
| HBAC | 1 | 1 | 2 |
| HAA | 0 | 2 | 2 |
| NA | 0 | 1 | 1 |
| NHNA | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Yellowstone County population
80.5 mi, 
83°
• Gallatin County
62.5 mi, 
250°
• Park County
39.3 mi, 
226°
• Carbon County
60.1 mi, 
132°
• Stillwater County
29 mi, 
111°
• Broadwater County
82.7 mi, 
295°
• Wheatland County
47.4 mi, 
4°
• Judith Basin County
86 mi, 
348°
• Meagher County
71 mi, 
318°
• Golden Valley County
53.7 mi, 
43°
[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
*Park, Meagher, Custer; Yellowstone Montana Notes
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