| Name | Lewis and Clark County |
| State | Montana |
| FIPS Code | 30049 |
| County Seat | Helena |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2024) | 74,812 |
| Population Growth Rate(2020-2024) | 5.13% |
| Majority Ethnicity | White 93.8% |
| Public School Majority Ethnicity | White 85% |
| Partisan Voting Index | Republican:+3 |
| Unemployment Rate (May 2026) | 3.9% |
| Sales Tax Rate (2025) | 0% |
| Area Code(s) | 406 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 93.8% |
| African American | 0.59% |
| Hispanic | 4% |
| Asian | 0.68% |
| Native American | 0.93% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 84.78% |
| African American | 0.91% |
| Hispanic | 7.03% |
| Asian | 0.64% |
| Native American | 2.97% |
| Hawaiin/Pacific Islander | 0.14% |