County ZIP codes · Montana · FIPS 30111
Yellowstone County, MT ZIP Codes
Yellowstone County, Montana has 25 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 15 residential and 10 for PO boxes or a single organization. 12 of the residential ones lie mainly in Yellowstone County and 3 mainly in a neighboring county; 8 cross the county line. Median household income ranges from $58,598 in 59101 to $125,833 in 59106 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Yellowstone County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $76,141 and $87,648.
They carry 12 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 15 residential ZIP codes in Yellowstone County
12 ZIP codes lie mainly in Yellowstone County; 3 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 59102 | Billings | 47,977 | 3,190 | $76k | $335k | 100% |
| 59101 | Billings | 42,250 | 72 | $59k | $269k | 98% |
| 59105 | Billings | 35,480 | 370 | $78k | $349k | 100% |
| 59106 | Billings | 21,417 | 191 | $126k | $497k | 100% |
| 59044 | Laurel | 12,302 | 70 | $88k | $347k | 91% |
| 59079 | Shepherd | 3,940 | 12 | $68k | $376k | 100% |
| 59037 | Huntley | 2,336 | 19 | $105k | $354k | 93% |
| 59088 | Worden | 1,265 | 4 | $91k | $234k | 100% |
| 59006 | Ballantine | 586 | 9 | $53k | $314k | 100% |
| 59015 | Broadview | 394 | 2 | $70k | $238k | 52% |
| 59024 | Custer | 335 | 1 | $78k | $240k | 92% |
| 59002 | Acton | 221 | 3 | $37k | $333k | 100% |
Partly in Yellowstone County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
8 ZIP codes of Yellowstone County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Yellowstone | Elsewhere |
|---|---|---|
| 59101 | 98% | Big Horn County 2% |
| 59044 | 91% | Carbon County 9% |
| 59037 | 93% | Big Horn County 7% |
| 59041 | 3% | Carbon County 97% |
| 59057 | 32% | Stillwater County 68% |
| 59015 | 52% | Stillwater County 29%; Musselshell County 19% |
| 59024 | 92% | Big Horn County 8% |
| 59064 | 28% | Big Horn County 72% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Yellowstone County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Yellowstone County's ZIP codes use 2 prefixes: 590 and 591.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 590 | Billings, MT (SCF 590) | 11 | 75 |
| 591 | Billings, MT (SCF 590) | 14 | 14 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.