County ProfileMT
Lewis and Clark County
Population: 70,973 · 15 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
70,973
People
Median age
41.8
Housing
Total households
31,215
Income
Median household income
$78,237
Housing
Total housing units
34,082
Employment
Employment rate
61.1%
Education
Bachelor’s degree or higher
43%
Healthcare
Insured population
94.3%
County details
Local time 01:22:08(MT)| Name | Lewis and Clark |
|---|---|
| Total ZIP codes | 15total |
| ZIP codes (by type) | 8 Standard5 PO Box2 Unique |
| Area code | 406 |
| Timezone | Mountain Time (MT) |
| Coordinates | 47.1221055, -112.38289 |
| Land area | 3,458.4 sq miles(8,957.2 km²) |
Map of Lewis and Clark county, Montana with ZIP codes
Cities and Communities in Lewis and Clark County
Compare the largest cities in Lewis and Clark County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| Helena | 32,091 | $71,036 | 8ZIPs |
| East Helena | 1,944 | $60,417 | 1ZIPs |
| Lincoln | 998 | $62,813 | 1ZIPs |
| Augusta | 316 | $43,611 | 1ZIPs |
| Marysville | 82 | $99,167 | 1ZIPs |
| Canyon Creek | 47 | — | 1ZIPs |
| Fort Harrison | 37 | — | 1ZIPs |
| Wolf Creek | 25 | $72,500 | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in Lewis and Clark County
Review the most populated postal areas across Lewis and Clark County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 59601 | Helena | $72,290 | 30,848 |
| 59602 | Helena | $92,985 | 29,390 |
| 59635 | East Helena | $83,740 | 7,738 |
| 59639 | Lincoln | $57,778 | 1,230 |
| 59410 | Augusta | $42,321 | 887 |
| 59648 | Wolf Creek | $65,750 | 618 |
| 59625 | Helena | — | 294 |
| 59633 | Canyon Creek | — | 248 |
| 59640 | Marysville | $99,167 | 113 |
| 59636 | Fort Harrison | — | 37 |
| 59604 | Helena | — | — |
| 59620 | Helena | — | — |
| 59623 | Helena | — | — |
| 59624 | Helena | — | — |
| 59626 | Helena | — | — |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS