| ZIP Codes: | 15 ZIP Codes (8 Standard, 5 PO Box, 2 Unique) [See All] |
| Area Code: | 406 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:12:53 PM |
| Population: | 73,928 [See All] |
| FIPS: | 30049 |
| CBSA: | Helena, MT |
| Land Area: | 3,668 sq mi |
| Water Area: | 41 sq mi |
| Coordinates: | 46.7556, -112.1629 |
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73,928 residents live across 15 ZIPs covering 3,668 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 65,079 to 73,265 from 2014 to 2024 — a +12.6% change. 7 ZIPs gained residents, 2 lost.
The county's wealthiest ZIP 59602 (Helena, $92,985 median) and poorest ZIP 59410 (Augusta, $42,321) are 69.9 miles apart — a 2.2× income gap across local geography.
Median home values vary 1.6× across this county — from $259,400 in 59410 (Augusta) to $408,600 in 59602 (Helena).
Density varies 16737× across the county — from 0 people/sq mi in 59410 (Augusta) to 7,433 in 59625 (Helena).
Most of the decade's growth concentrated around Helena — top growth ZIPs averaged +12.9% over the past ten years ( 59602 , 59635 and 59601 ).
Educational attainment ranges from 21.6% bachelor's+ in 59648 (Wolf Creek) to 50.9% in 59601 (Helena) — the breadth of educational profiles across the area.
Within Montana, this is the #6 most populous of 56 counties and ranks #16 for median household income with the #11 fastest decade growth .
Weighted by population, the typical household earns about $81,913 across the county — reflecting what a typical resident sees, not a simple ZIP average.
43.5% of adults age 25+ hold a bachelor's degree or higher (23,003 of 52,885 reporting). The most-educated ZIPs cluster around Helena.
8 Standard delivery, 5 PO Box only, 2 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 59601 | Helena | Standard | 31,728 | $72,290 | 160.3 | 7.7% |
| 59602 | Helena | Standard | 30,754 | $92,985 | 655.3 | 21.2% |
| 59635 | East Helena | Standard | 8,292 | $83,740 | 109.4 | 9.8% |
| 59639 | Lincoln | Standard | 1,021 | $57,778 | 720.8 | -10.4% |
| 59625 | Helena | Unique | 663 | — | 0.1 | — |
| 59410 | Augusta | PO Box | 520 | $42,321 | 1,170.9 | -24.2% |
| 59648 | Wolf Creek | Standard | 486 | $65,750 | 626.0 | 1.9% |
| 59633 | Canyon Creek | Standard | 272 | — | 180.8 | 0.7% |
| 59640 | Marysville | Standard | 160 | $99,167 | 41.2 | 40.4% |
| 59636 | Fort Harrison | PO Box | 32 | — | 3.3 | 220.0% |
| 59623 | Helena | Unique | 0 | — | 0.0 | — |
| 59624 | Helena | PO Box | — | — | 0.0 | — |
| 59626 | Helena | Standard | — | — | 0.0 | — |
| 59604 | Helena | PO Box | — | — | 0.0 | — |
| 59620 | Helena | PO Box | — | — | 0.0 | — |