Last official estimated population of Prairie County was 1,189 (year 2014)[1]. This was 0% of total US population and 0.1% of total Montana state population. Area of Prairie County is 1,742.5 mi² (=4513.1 km²), in this year population density was 0.68 p/mi². If population growth rate would be same as in period 2010-2014 (+0.21%/yr), Prairie County population in 2026 would be 1,220 [0].
Historical population of Prairie 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] +0.68 %/yr
[1930-1940] -4.8 %/yr
[1940-1950] -0.14 %/yr
[1950-1960] -0.25 %/yr
[1960-1970] -2.76 %/yr
[1970-1980] +0.47 %/yr
[1980-1990] -2.79 %/yr
[1990-2000] -1.42 %/yr
[2000-2005] -1.74 %/yr
[2005-2010] +1.43 %/yr
[2010-2014] +0.21 %/yr
Looking for settlements in Prairie County? Visit this page: Settlements in Prairie County, MT
Population of Prairie County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 40 | 35 | 75 |
| 5 to 9 | 21 | 23 | 44 |
| 10 to 14 | 28 | 25 | 53 |
| 15 to 19 | 28 | 30 | 58 |
| 20 to 24 | 18 | 25 | 43 |
| 25 to 29 | 22 | 22 | 44 |
| 30 to 34 | 20 | 18 | 38 |
| 35 to 39 | 33 | 21 | 54 |
| 40 to 44 | 27 | 28 | 55 |
| 45 to 49 | 26 | 27 | 53 |
| 50 to 54 | 30 | 44 | 74 |
| 55 to 59 | 53 | 44 | 97 |
| 60 to 64 | 57 | 59 | 116 |
| 65 to 69 | 68 | 58 | 126 |
| 70 to 74 | 46 | 34 | 80 |
| 75 to 79 | 24 | 22 | 46 |
| 80 to 84 | 15 | 26 | 41 |
| 85+ | 27 | 24 | 51 |
Prairie 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 | 575 | 553 | 1,128 |
| NH | 570 | 554 | 1,124 |
| NHWAC | 562 | 542 | 1,104 |
| WA | 560 | 528 | 1,088 |
| NHWA | 547 | 517 | 1,064 |
| TOM | 16 | 26 | 42 |
| NHTOM | 16 | 26 | 42 |
| NHIAC | 10 | 18 | 28 |
| IAC | 10 | 18 | 28 |
| H | 13 | 11 | 24 |
| HWA | 13 | 11 | 24 |
| HWAC | 13 | 11 | 24 |
| NHAAC | 7 | 12 | 19 |
| AAC | 7 | 12 | 19 |
| BAC | 7 | 6 | 13 |
| NHBAC | 7 | 6 | 13 |
| NHAA | 3 | 7 | 10 |
| AA | 3 | 7 | 10 |
| IA | 2 | 3 | 5 |
| NHIA | 2 | 3 | 5 |
| BA | 2 | 1 | 3 |
| NHBA | 2 | 1 | 3 |
| NHNAC | 0 | 2 | 2 |
| NAC | 0 | 2 | 2 |
| HNAC | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| HTOM | 0 | 0 | 0 |
| HIAC | 0 | 0 | 0 |
| HBAC | 0 | 0 | 0 |
| HIA | 0 | 0 | 0 |
• Custer County population
38.1 mi, 
183°
• Richland County
80.4 mi, 
33°
• Rosebud County
70.8 mi, 
231°
• Dawson County
42.6 mi, 
41°
• Fallon County
62.3 mi, 
123°
• McCone County
57.7 mi, 
348°
• Golden Valley County
78.9 mi, 
83°
• Garfield County
76.9 mi, 
294°
• Wibaux County
59 mi, 79°
• Treasure County
94.2 mi, 
243°
[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, Dawson Montana Notes
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