Lewis and Clark County's estimated 2026 population is 75,570 with a growth rate of 0.32% in the past year according to the most recent United States census data. Lewis and Clark County is the 6th largest county in Montana. The 2010 population was 63,578 and has seen a growth of 18.86% since that time.
Data after 2023 is projected based on recent change
Overall: 41.8 years
Female: 42.6 years
Male: 40.9 years
There are 57,898 adults, (14,843 of whom are seniors) in Lewis and Clark County.
Female: 37,002 (50.4%)
Male: 36,462 (49.6%)
The racial composition of Lewis and Clark County includes 90.65% White, and smaller percentages for Native American, other race, Black or African American, Asian and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 66,597 | 90.65% |
| Two or more races | 4,478 | 6.1% |
| Native American | 965 | 1.31% |
| Other race | 648 | 0.88% |
| Black or African American | 417 | 0.57% |
| Asian | 359 | 0.49% |
Lewis and Clark County's average per capita income is $53,368. Household income levels show a median of $78,237. The poverty rate stands at 8.06%.
Name | Median | Mean |
|---|---|---|
| Married Families | $115,896 | $136,674 |
| Families | $104,950 | $126,549 |
| Households | $78,237 | $104,055 |
| Non Families | $47,346 | $67,560 |
Average Income
Median Household Income
Poverty Rate
