Last official estimated population of Petroleum County was 492 (year 2014)[1]. This was 0% of total US population and 0% of total Montana state population. Area of Petroleum County is 1,674.5 mi² (=4337 km²), in this year population density was 0.29 p/mi². If population growth rate would be same as in period 2010-2014 (-0.1%/yr), Petroleum County population in 2026 would be 486 [0].
Historical population of Petroleum County for period 1930-2014 [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
[1930-1940] -6.16 %/yr
[1940-1950] -0.54 %/yr
[1950-1960] -1.37 %/yr
[1960-1970] -2.77 %/yr
[1970-1980] -0.3 %/yr
[1980-1990] -2.3 %/yr
[1990-2000] -0.51 %/yr
[2000-2005] -0.04 %/yr
[2005-2010] +0.08 %/yr
[2010-2014] -0.1 %/yr
Looking for settlements in Petroleum County? Visit this page: Settlements in Petroleum County, MT
Population of Petroleum County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 9 | 2 | 11 |
| 5 to 9 | 17 | 12 | 29 |
| 10 to 14 | 19 | 18 | 37 |
| 15 to 19 | 25 | 20 | 45 |
| 20 to 24 | 10 | 8 | 18 |
| 25 to 29 | 11 | 7 | 18 |
| 30 to 34 | 8 | 7 | 15 |
| 35 to 39 | 12 | 10 | 22 |
| 40 to 44 | 5 | 11 | 16 |
| 45 to 49 | 22 | 17 | 39 |
| 50 to 54 | 28 | 18 | 46 |
| 55 to 59 | 25 | 24 | 49 |
| 60 to 64 | 20 | 18 | 38 |
| 65 to 69 | 15 | 12 | 27 |
| 70 to 74 | 13 | 16 | 29 |
| 75 to 79 | 12 | 10 | 22 |
| 80 to 84 | 6 | 7 | 13 |
| 85+ | 8 | 3 | 11 |
Petroleum 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 | 263 | 219 | 482 |
| NH | 261 | 218 | 479 |
| WA | 261 | 216 | 477 |
| NHWAC | 259 | 217 | 476 |
| NHWA | 257 | 214 | 471 |
| HWA | 4 | 2 | 6 |
| H | 4 | 2 | 6 |
| HWAC | 4 | 2 | 6 |
| NHIAC | 2 | 4 | 6 |
| IAC | 2 | 4 | 6 |
| NHTOM | 2 | 3 | 5 |
| TOM | 2 | 3 | 5 |
| IA | 2 | 1 | 3 |
| NHIA | 2 | 1 | 3 |
| NHBAC | 2 | 0 | 2 |
| BAC | 2 | 0 | 2 |
| HNAC | 0 | 0 | 0 |
| HIAC | 0 | 0 | 0 |
| BA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| NHNAC | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| NHAAC | 0 | 0 | 0 |
| NHBA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| NHAA | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| NAC | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| AAC | 0 | 0 | 0 |
| HBAC | 0 | 0 | 0 |
| HIA | 0 | 0 | 0 |
| HTOM | 0 | 0 | 0 |
| AA | 0 | 0 | 0 |
• Yellowstone County population
83.3 mi, 
181°
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47.2 mi, 
276°
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95.3 mi, 
338°
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45.1 mi, 
192°
• Phillips County
77.8 mi, 
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• Wheatland County
89 mi, 
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• Judith Basin County
98.1 mi, 
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• Garfield County
59 mi, 
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• Golden Valley County
69.1 mi, 
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• Treasure County
78.5 mi, 
145°
[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 Montana Notes
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