Last official estimated population of Musselshell County was 4,548 (year 2014)[1]. This was 0.001% of total US population and 0.4% of total Montana state population. Area of Musselshell County is 1,871.7 mi² (=4847.8 km²), in this year population density was 2.43 p/mi². If population growth rate would be same as in period 2010-2014 (+0.06%/yr), Musselshell County population in 2024 would be 4,573 [0].
Historical population of Musselshell 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] -4.95 %/yr
[1930-1940] -2.34 %/yr
[1940-1950] -0.55 %/yr
[1950-1960] -1.01 %/yr
[1960-1970] -2.66 %/yr
[1970-1980] +1.72 %/yr
[1980-1990] -0.75 %/yr
[1990-2000] +0.9 %/yr
[2000-2005] -0.76 %/yr
[2005-2010] +0.98 %/yr
[2010-2014] +0.06 %/yr
Looking for settlements in Musselshell County? Visit this page: Settlements in Musselshell County, MT
Population of Musselshell County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 113 | 109 | 222 |
| 5 to 9 | 129 | 115 | 244 |
| 10 to 14 | 141 | 133 | 274 |
| 15 to 19 | 123 | 131 | 254 |
| 20 to 24 | 90 | 100 | 190 |
| 25 to 29 | 83 | 76 | 159 |
| 30 to 34 | 117 | 99 | 216 |
| 35 to 39 | 89 | 118 | 207 |
| 40 to 44 | 146 | 111 | 257 |
| 45 to 49 | 147 | 135 | 282 |
| 50 to 54 | 186 | 199 | 385 |
| 55 to 59 | 206 | 221 | 427 |
| 60 to 64 | 242 | 251 | 493 |
| 65 to 69 | 188 | 182 | 370 |
| 70 to 74 | 138 | 115 | 253 |
| 75 to 79 | 77 | 75 | 152 |
| 80 to 84 | 46 | 53 | 99 |
| 85+ | 41 | 64 | 105 |
Musselshell 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 | 2243 | 2231 | 4,474 |
| NH | 2229 | 2205 | 4,434 |
| WA | 2201 | 2186 | 4,387 |
| NHWAC | 2176 | 2158 | 4,334 |
| NHWA | 2138 | 2126 | 4,264 |
| H | 73 | 82 | 155 |
| HWAC | 67 | 73 | 140 |
| IAC | 72 | 62 | 134 |
| HWA | 63 | 60 | 123 |
| NHIAC | 64 | 49 | 113 |
| TOM | 45 | 45 | 90 |
| NHTOM | 40 | 32 | 72 |
| IA | 40 | 29 | 69 |
| NHIA | 35 | 25 | 60 |
| BAC | 20 | 22 | 42 |
| NHBAC | 17 | 16 | 33 |
| BA | 11 | 17 | 28 |
| AAC | 12 | 15 | 27 |
| NHBA | 11 | 12 | 23 |
| NHAAC | 11 | 11 | 22 |
| HIAC | 8 | 13 | 21 |
| HTOM | 5 | 13 | 18 |
| AA | 4 | 9 | 13 |
| NHAA | 4 | 9 | 13 |
| HIA | 5 | 4 | 9 |
| HBAC | 3 | 6 | 9 |
| NAC | 2 | 4 | 6 |
| NHNAC | 2 | 3 | 5 |
| HAAC | 1 | 4 | 5 |
| HBA | 0 | 5 | 5 |
| NHNA | 1 | 1 | 2 |
| NA | 1 | 1 | 2 |
| HNAC | 0 | 1 | 1 |
| HAA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Yellowstone County population
40 mi, 
168°
• Fergus County
61.9 mi, 
323°
• Rosebud County
87.6 mi, 
105°
• Stillwater County
73.9 mi, 
217°
• Sweet Grass County
86.3 mi, 
236°
• Wheatland County
67.4 mi, 
269°
• Garfield County
87 mi, 
52°
• Golden Valley County
36 mi, 
256°
• Treasure County
58.9 mi, 110°
• Petroleum County
45.1 mi, 
12°
[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
*Fergus, Yellowstone; Meagher, Rosebud Montana Notes
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