Ranking of Montana Counties By Percentage of Population Aged 25 years and above with an Educational attainment of High School Graduate or Equivalent in 2021 (ACS-5Yrs)
Updated on September 3, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the percentage of the population of Montana (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 27.80%. Among all Montana counties, Powell County had the highest percentage of its population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (42.31%), followed by Garfield County (41.64%), and Petroleum County (41.27%).
The chart below shows the top 10 Montana counties, and the table below shows the ranking of all Montana counties.
You can see similar information for other educational attainments.
You can also see similar information for other states and for the United States.
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Related Topics: Montana ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Montana Counties By Percentage of Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
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| Rank | County | Percentage of Population (Aged 25yrs+) (%) |
|---|---|---|
| 1 | Powell County | 42.31 |
| 2 | Garfield County | 41.64 |
| 3 | Petroleum County | 41.27 |
| 4 | Wheatland County | 39.29 |
| 5 | Sanders County | 39.12 |
| 6 | Wibaux County | 38.89 |
| 7 | Richland County | 38.82 |
| 8 | Lincoln County | 38.04 |
| 9 | Deer Lodge County | 37.53 |
| 10 | Golden Valley County | 37.26 |
| 11 | Glacier County | 37.17 |
| 12 | Daniels County | 35.36 |
| 13 | Toole County | 35.29 |
| 14 | Phillips County | 35.14 |
| 15 | Musselshell County | 35.05 |
| 16 | Sheridan County | 35.03 |
| 17 | Chouteau County | 34.79 |
| 18 | Silver Bow County | 34.51 |
| 19 | Teton County | 34.40 |
| 20 | Fallon County | 34.25 |
| 21 | Big Horn County | 33.88 |
| 22 | Mineral County | 33.85 |
| 23 | Treasure County | 33.52 |
| 24 | Meagher County | 33.43 |
| 25 | Valley County | 33.25 |
| 26 | Rosebud County | 32.94 |
| 27 | Sweet Grass County | 32.55 |
| 28 | Roosevelt County | 32.44 |
| 29 | Powder River County | 32.20 |
| 30 | Fergus County | 32.13 |
| 31 | Stillwater County | 32.04 |
| 32 | McCone County | 31.63 |
| 33 | Cascade County | 31.28 |
| 34 | Carter County | 31.16 |
| 35 | Carbon County | 30.27 |
| 36 | Dawson County | 30.22 |
| 37 | Hill County | 30.11 |
| 38 | Ravalli County | 29.78 |
| 39 | Judith Basin County | 29.75 |
| 40 | Custer County | 29.73 |
| 41 | Pondera County | 29.25 |
| 42 | Prairie County | 28.84 |
| 43 | Granite County | 28.23 |
| 44 | Beaverhead County | 28.06 |
| 45 | Madison County | 28.03 |
| 46 | Yellowstone County | 28.00 |
| 47 | Flathead County | 27.88 |
| 48 | Park County | 27.10 |
| 49 | Blaine County | 26.65 |
| 50 | Jefferson County | 26.59 |
| 51 | Broadwater County | 26.53 |
| 52 | Lake County | 25.25 |
| 53 | Lewis and Clark County | 23.26 |
| 54 | Missoula County | 20.80 |
| 55 | Liberty County | 19.93 |
| 56 | Gallatin County | 18.32 |
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