Last official estimated population of Garfield County was 1,186 (year 2014)[1]. This was 0% of total US population and 0.1% of total Montana state population. Area of Garfield County is 4,849.0 mi² (=12558.9 km²), in this year population density was 0.24 p/mi². If population growth rate would be same as in period 2010-2014 (-0.42%/yr), Garfield County population in 2024 would be 1,137 [0].
Historical population of Garfield 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] -2.3 %/yr
[1930-1940] -4.65 %/yr
[1940-1950] -1.94 %/yr
[1950-1960] -0.92 %/yr
[1960-1970] -0.98 %/yr
[1970-1980] -0.81 %/yr
[1980-1990] -0.41 %/yr
[1990-2000] -2.15 %/yr
[2000-2005] -1.23 %/yr
[2005-2010] +0.07 %/yr
[2010-2014] -0.42 %/yr
Looking for settlements in Garfield County? Visit this page: Settlements in Garfield County, MT
Population of Garfield County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 28 | 47 | 75 |
| 5 to 9 | 51 | 40 | 91 |
| 10 to 14 | 31 | 43 | 74 |
| 15 to 19 | 48 | 42 | 90 |
| 20 to 24 | 21 | 24 | 45 |
| 25 to 29 | 20 | 29 | 49 |
| 30 to 34 | 50 | 43 | 93 |
| 35 to 39 | 39 | 29 | 68 |
| 40 to 44 | 31 | 36 | 67 |
| 45 to 49 | 30 | 32 | 62 |
| 50 to 54 | 30 | 51 | 81 |
| 55 to 59 | 48 | 44 | 92 |
| 60 to 64 | 73 | 53 | 126 |
| 65 to 69 | 54 | 34 | 88 |
| 70 to 74 | 41 | 42 | 83 |
| 75 to 79 | 33 | 27 | 60 |
| 80 to 84 | 11 | 22 | 33 |
| 85+ | 14 | 18 | 32 |
Garfield 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 | 649 | 650 | 1,299 |
| NH | 646 | 647 | 1,293 |
| WA | 644 | 648 | 1,292 |
| NHWAC | 642 | 641 | 1,283 |
| NHWA | 637 | 639 | 1,276 |
| HWA | 7 | 9 | 16 |
| H | 7 | 9 | 16 |
| HWAC | 7 | 9 | 16 |
| NHIAC | 5 | 6 | 11 |
| IAC | 5 | 6 | 11 |
| TOM | 5 | 2 | 7 |
| NHTOM | 5 | 2 | 7 |
| BAC | 4 | 1 | 5 |
| NHBAC | 4 | 1 | 5 |
| IA | 1 | 4 | 5 |
| NHIA | 1 | 4 | 5 |
| BA | 3 | 1 | 4 |
| NHBA | 3 | 1 | 4 |
| AA | 0 | 1 | 1 |
| NHAA | 0 | 1 | 1 |
| NHAAC | 0 | 1 | 1 |
| AAC | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| NAC | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| NHNAC | 0 | 0 | 0 |
| HBAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HIA | 0 | 0 | 0 |
| HTOM | 0 | 0 | 0 |
| HIAC | 0 | 0 | 0 |
• Custer County population
97.8 mi, 
135°
• Rosebud County
78 mi, 
168°
• Dawson County
97.8 mi, 
90°
• Valley County
75.4 mi, 
11°
• Musselshell County
87 mi, 
232°
• Phillips County
80 mi, 
326°
• McCone County
62.3 mi, 
67°
• Prairie County
76.9 mi, 
114°
• Treasure County
75.3 mi, 
190°
• Petroleum County
59 mi, 
260°
[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
*Dawson; Rosebud Montana Notes
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