Last official estimated population of Fallon County was 2,891 (year 2014)[1]. This was 0.001% of total US population and 0.3% of total Montana state population. Area of Fallon County is 1,622.7 mi² (=4202.9 km²), in this year population density was 1.78 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Fallon County population in 2026 would be 2,894 [0].
Historical population of Fallon 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] +0.04 %/yr
[1930-1940] -2.04 %/yr
[1940-1950] -0.16 %/yr
[1950-1960] +0.88 %/yr
[1960-1970] +0.13 %/yr
[1970-1980] -0.73 %/yr
[1980-1990] -1.91 %/yr
[1990-2000] -0.9 %/yr
[2000-2005] -0.88 %/yr
[2005-2010] +1.28 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Fallon County? Visit this page: Settlements in Fallon County, MT
Population of Fallon County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 133 | 108 | 241 |
| 5 to 9 | 111 | 126 | 237 |
| 10 to 14 | 97 | 117 | 214 |
| 15 to 19 | 97 | 69 | 166 |
| 20 to 24 | 91 | 81 | 172 |
| 25 to 29 | 119 | 87 | 206 |
| 30 to 34 | 98 | 86 | 184 |
| 35 to 39 | 98 | 90 | 188 |
| 40 to 44 | 91 | 78 | 169 |
| 45 to 49 | 81 | 77 | 158 |
| 50 to 54 | 101 | 104 | 205 |
| 55 to 59 | 150 | 133 | 283 |
| 60 to 64 | 98 | 99 | 197 |
| 65 to 69 | 76 | 65 | 141 |
| 70 to 74 | 49 | 44 | 93 |
| 75 to 79 | 45 | 47 | 92 |
| 80 to 84 | 37 | 50 | 87 |
| 85+ | 23 | 52 | 75 |
Fallon 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 | 1562 | 1496 | 3,058 |
| NH | 1563 | 1491 | 3,054 |
| WA | 1538 | 1481 | 3,019 |
| NHWAC | 1533 | 1475 | 3,008 |
| NHWA | 1512 | 1460 | 2,972 |
| H | 32 | 22 | 54 |
| HWAC | 29 | 21 | 50 |
| HWA | 26 | 21 | 47 |
| IAC | 27 | 15 | 42 |
| TOM | 24 | 15 | 39 |
| NHIAC | 23 | 14 | 37 |
| NHTOM | 21 | 15 | 36 |
| AAC | 16 | 8 | 24 |
| NHAAC | 15 | 8 | 23 |
| IA | 15 | 8 | 23 |
| NHIA | 12 | 7 | 19 |
| NHAA | 10 | 8 | 18 |
| AA | 10 | 8 | 18 |
| BAC | 10 | 7 | 17 |
| NHBAC | 9 | 7 | 16 |
| NAC | 4 | 2 | 6 |
| NHNAC | 4 | 2 | 6 |
| BA | 5 | 0 | 5 |
| NHBA | 5 | 0 | 5 |
| HIAC | 4 | 1 | 5 |
| NA | 3 | 1 | 4 |
| HIA | 3 | 1 | 4 |
| NHNA | 3 | 1 | 4 |
| HTOM | 3 | 0 | 3 |
| HBAC | 1 | 0 | 1 |
| HAAC | 1 | 0 | 1 |
| HNAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Custer County population
54.8 mi, 
265°
• Dawson County
70 mi, 
340°
• Bowman County
45.4 mi, 
108°
• Golden Valley County
50.5 mi, 
31°
• Harding County
67 mi, 
138°
• Prairie County
62.3 mi, 
303°
• Carter County
55.6 mi, 
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• Wibaux County
45 mi, 
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• Billings County
68.6 mi, 
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• Slope County
45.8 mi, 
78°
[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
*Custer Montana Notes
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