Ranking of Montana Counties By 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 population of Montana (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 207,496. Among all Montana counties, Yellowstone County had the highest population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (31,356), followed by Flathead County (20,566), and Cascade County (18,023).
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 Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
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| Rank | County | Number of People |
|---|---|---|
| 1 | Yellowstone County | 31356 |
| 2 | Flathead County | 20566 |
| 3 | Cascade County | 18023 |
| 4 | Missoula County | 16601 |
| 5 | Gallatin County | 13764 |
| 6 | Lewis and Clark County | 11523 |
| 7 | Ravalli County | 9763 |
| 8 | Silver Bow County | 8313 |
| 9 | Lincoln County | 5771 |
| 10 | Lake County | 5412 |
| 11 | Sanders County | 3703 |
| 12 | Park County | 3586 |
| 13 | Glacier County | 3135 |
| 14 | Hill County | 3042 |
| 15 | Richland County | 2928 |
| 16 | Deer Lodge County | 2770 |
| 17 | Fergus County | 2739 |
| 18 | Custer County | 2544 |
| 19 | Big Horn County | 2521 |
| 20 | Carbon County | 2433 |
| 21 | Jefferson County | 2331 |
| 22 | Powell County | 2293 |
| 23 | Stillwater County | 2062 |
| 24 | Roosevelt County | 2021 |
| 25 | Dawson County | 1976 |
| 26 | Madison County | 1890 |
| 27 | Beaverhead County | 1787 |
| 28 | Valley County | 1766 |
| 29 | Rosebud County | 1740 |
| 30 | Teton County | 1436 |
| 31 | Chouteau County | 1427 |
| 32 | Musselshell County | 1274 |
| 33 | Toole County | 1259 |
| 34 | Broadwater County | 1257 |
| 35 | Pondera County | 1200 |
| 36 | Mineral County | 1158 |
| 37 | Blaine County | 1127 |
| 38 | Phillips County | 1059 |
| 39 | Sheridan County | 890 |
| 40 | Sweet Grass County | 842 |
| 41 | Fallon County | 713 |
| 42 | Granite County | 702 |
| 43 | Wheatland County | 611 |
| 44 | Meagher County | 477 |
| 45 | Daniels County | 460 |
| 46 | McCone County | 426 |
| 47 | Judith Basin County | 423 |
| 48 | Powder River County | 418 |
| 49 | Carter County | 320 |
| 50 | Liberty County | 281 |
| 51 | Wibaux County | 280 |
| 52 | Garfield County | 279 |
| 53 | Prairie County | 263 |
| 54 | Golden Valley County | 234 |
| 55 | Treasure County | 184 |
| 56 | Petroleum County | 137 |