ZIP code 59638
Where is ZIP code 59638?
Jefferson City, Montana
Jefferson County · PO Box only ZIP code
ZIP code 59638 belongs to Jefferson City, Montana in Jefferson County. 59638 is a PO Box only ZIP code: it is used for post office boxes at the Jefferson City post office, not for street addresses. It is in the Mountain Time zone and uses area code 406. About 769 people live in the 59638 area, where the median household income is $126,723. The closest ZIP codes are 59634 (Clancy, 6.9 mi north), 59631 (Basin, 8.7 mi west) and 59632 (Boulder, 10.4 mi southwest).
| ZIP code | 59638 |
|---|---|
| Type | PO Box only (no street delivery) |
| Status | Active |
| City | Jefferson City |
| Also accepted | Jefferson Cty |
| State | Montana (MT) |
| County | Jefferson County |
| Time zone | Mountain Time · now |
| Area code | 406 |
| Coordinates | 46.3679, -112.0232 map |
| 3-digit prefix | 596 |
Population and income in 59638
| Population | 769 · higher than 60% of Montana ZIP codes |
|---|---|
| People per square mile | 13 · higher than 81% of Montana ZIP codes |
| Median age | 45.1 years · lower than 54% of Montana ZIP codes |
| Men / women | 51% / 49% |
| Median household income | $126,723 · higher than 98% of Montana ZIP codes |
| Income per person | $48,581 |
| Below the poverty line | 0.0% |
| Bachelor’s degree or higher | 31% of adults 25+ |
| Housing units | 271 |
| Households | 271 (2.84 people on average) |
| Owners / renters | 98% / 2.2% |
| Land area | 60.41 sq mi |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 59638. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 59638
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 59634 | Clancy, MT | 6.9 mi N | Standard |
| 59631 | Basin, MT | 8.7 mi W | PO Box only |
| 59632 | Boulder, MT | 10.4 mi SW | Standard |
| 59623 | Helena, MT | 15.4 mi N | Unique |
| 59620 | Helena, MT | 15.5 mi N | PO Box only |
| 59624 | Helena, MT | 15.5 mi N | PO Box only |
| 59626 | Helena, MT | 15.5 mi N | Standard |
| 59625 | Helena, MT | 16.2 mi N | Unique |
| 59635 | East Helena, MT | 16.8 mi N | Standard |
| 59601 | Helena, MT | 16.9 mi N | Standard |
| 59636 | Fort Harrison, MT | 17.9 mi N | PO Box only |
| 59647 | Winston, MT | 18.7 mi E | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 59638 or measure the distance to another ZIP code.
How to address mail to 59638
PO BOX 123
JEFFERSON CITY MT 59638
Put the city, the two-letter state code and the ZIP code on the last line. USPS also accepts JEFFERSON CTY as the city name for 59638. Adding the 4-digit ZIP+4 code (59638-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 59638?
- 59638 is a Jefferson City, Montana ZIP code. Jefferson Cty is also accepted as the city name.
- What county is 59638 in?
- ZIP code 59638 is in Jefferson County, Montana.
- What time zone is ZIP code 59638 in?
- 59638 is in the Mountain Time zone (America/Denver).
- What area code is 59638?
- Phone numbers in ZIP code 59638 use area code 406.
- What is the population of ZIP code 59638?
- About 769 people live in ZIP code 59638, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 59638?
- The median household income in 59638 is $126,723 a year, higher than 98% of Montana ZIP codes.
- Can I use 59638 for a street address?
- No. 59638 is only for PO Boxes. Street addresses in Jefferson City use another ZIP code.
- What ZIP codes are near 59638?
- The nearest ZIP codes to 59638 are 59634 (Clancy, 6.9 miles), 59631 (Basin, 8.7 miles), 59632 (Boulder, 10.4 miles) and 59623 (Helena, 15.4 miles).