Ranking of Montana Counties By Percentage of Population Aged 25 years and above with an Educational attainment of Less than High School Diploma 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 Less than High School Diploma was 5.65%. Among all Montana counties, Liberty County had the highest percentage of its population (aged 25 years and above) with an educational attainment of Less than High School Diploma (27.38%), followed by Prairie County (13.05%), and Glacier County (11.44%).
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 Less than High School Diploma in 2021
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| Rank | County | Percentage of Population (Aged 25yrs+) (%) |
|---|---|---|
| 1 | Liberty County | 27.38 |
| 2 | Prairie County | 13.05 |
| 3 | Glacier County | 11.44 |
| 4 | Big Horn County | 10.61 |
| 5 | Toole County | 10.54 |
| 6 | Rosebud County | 10.53 |
| 7 | Powell County | 9.82 |
| 8 | Roosevelt County | 9.60 |
| 9 | Wheatland County | 9.45 |
| 10 | Blaine County | 9.32 |
| 11 | Deer Lodge County | 9.28 |
| 12 | Granite County | 9.05 |
| 13 | Sanders County | 8.97 |
| 14 | Treasure County | 8.93 |
| 15 | Hill County | 8.84 |
| 16 | Pondera County | 8.65 |
| 17 | Musselshell County | 8.64 |
| 18 | Lincoln County | 8.49 |
| 19 | Golden Valley County | 8.44 |
| 20 | Chouteau County | 7.92 |
| 21 | Carter County | 7.69 |
| 22 | Lake County | 7.67 |
| 23 | Teton County | 7.55 |
| 24 | Mineral County | 7.45 |
| 25 | Phillips County | 7.40 |
| 25 | Ravalli County | 7.40 |
| 25 | Sheridan County | 7.40 |
| 26 | Wibaux County | 7.36 |
| 27 | Stillwater County | 7.29 |
| 28 | Broadwater County | 7.09 |
| 29 | Daniels County | 7.07 |
| 30 | Cascade County | 7.04 |
| 31 | Valley County | 7.00 |
| 32 | Silver Bow County | 6.24 |
| 33 | Powder River County | 6.16 |
| 34 | Custer County | 5.93 |
| 35 | Beaverhead County | 5.47 |
| 35 | Jefferson County | 5.47 |
| 36 | Flathead County | 5.06 |
| 36 | Judith Basin County | 5.06 |
| 37 | Dawson County | 5.02 |
| 38 | Yellowstone County | 4.98 |
| 39 | Fergus County | 4.68 |
| 40 | Richland County | 4.61 |
| 41 | Fallon County | 4.51 |
| 42 | Carbon County | 4.49 |
| 43 | Lewis and Clark County | 4.37 |
| 44 | McCone County | 3.94 |
| 44 | Sweet Grass County | 3.94 |
| 45 | Missoula County | 3.66 |
| 46 | Meagher County | 3.64 |
| 47 | Madison County | 3.60 |
| 48 | Park County | 3.42 |
| 49 | Gallatin County | 2.55 |
| 50 | Garfield County | 2.39 |
| 51 | Petroleum County | 0.60 |