ZIP code 59631
Where is ZIP code 59631?
Basin, Montana
Jefferson County · PO Box only ZIP code
ZIP code 59631 belongs to Basin, Montana in Jefferson County. 59631 is a PO Box only ZIP code: it is used for post office boxes at the Basin post office, not for street addresses. It is in the Mountain Time zone and uses area code 406. About 375 people live in the 59631 area. The closest ZIP codes are 59632 (Boulder, 7.9 mi southeast), 59638 (Jefferson City, 8.7 mi east) and 59634 (Clancy, 13.7 mi northeast).
| ZIP code | 59631 |
|---|---|
| Type | PO Box only (no street delivery) |
| Status | Active |
| City | Basin |
| State | Montana (MT) |
| County | Jefferson County |
| Time zone | Mountain Time · now |
| Area code | 406 |
| Coordinates | 46.3296, -112.1967 map |
| 3-digit prefix | 596 |
Population and income in 59631
| Population | 375 · lower than 58% of Montana ZIP codes |
|---|---|
| People per square mile | 2 · lower than 53% of Montana ZIP codes |
| Median age | 51.3 years · higher than 63% of Montana ZIP codes |
| Men / women | 61% / 39% |
| Income per person | $43,212 |
| Below the poverty line | 14% |
| Bachelor’s degree or higher | 27% of adults 25+ |
| Median home value | $235,700 · lower than 63% of Montana ZIP codes |
| Housing units | 192 |
| Households | 164 (2.29 people on average) |
| Owners / renters | 76% / 24% |
| Land area | 156.44 sq mi (plus 0.02 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 59631. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 59631
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 59632 | Boulder, MT | 7.9 mi SE | Standard |
| 59638 | Jefferson City, MT | 8.7 mi E | PO Box only |
| 59634 | Clancy, MT | 13.7 mi NE | Standard |
| 59728 | Elliston, MT | 15.4 mi NW | PO Box only |
| 59623 | Helena, MT | 19.5 mi N | Unique |
| 59620 | Helena, MT | 19.7 mi NE | PO Box only |
| 59624 | Helena, MT | 19.7 mi NE | PO Box only |
| 59626 | Helena, MT | 19.7 mi NE | Standard |
| 59625 | Helena, MT | 20.2 mi N | Unique |
| 59636 | Fort Harrison, MT | 20.5 mi N | PO Box only |
| 59601 | Helena, MT | 21.3 mi NE | Standard |
| 59635 | East Helena, MT | 23.1 mi NE | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 59631 or measure the distance to another ZIP code.
How to address mail to 59631
PO BOX 123
BASIN MT 59631
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (59631-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 59631?
- 59631 is a Basin, Montana ZIP code.
- What county is 59631 in?
- ZIP code 59631 is in Jefferson County, Montana.
- What time zone is ZIP code 59631 in?
- 59631 is in the Mountain Time zone (America/Denver).
- What area code is 59631?
- Phone numbers in ZIP code 59631 use area code 406.
- What is the population of ZIP code 59631?
- About 375 people live in ZIP code 59631, according to the Census Bureau’s American Community Survey (2020–2024).
- Can I use 59631 for a street address?
- No. 59631 is only for PO Boxes. Street addresses in Basin use another ZIP code.
- What ZIP codes are near 59631?
- The nearest ZIP codes to 59631 are 59632 (Boulder, 7.9 miles), 59638 (Jefferson City, 8.7 miles), 59634 (Clancy, 13.7 miles) and 59728 (Elliston, 15.4 miles).