ZIP code 59231
Where is ZIP code 59231?
Saint Marie, Montana
Valley County · PO Box only ZIP code
ZIP code 59231 belongs to Saint Marie, Montana in Valley County. 59231 is a PO Box only ZIP code: it is used for post office boxes at the Saint Marie post office, not for street addresses. It is in the Mountain Time zone and uses area code 406. About 306 people live in the 59231 area, where the median household income is $38,971. The closest ZIP codes are 59230 (Glasgow, 14.2 mi south), 59244 (Larslan, 17.1 mi northeast) and 59273 (Vandalia, 17.2 mi west).
| ZIP code | 59231 |
|---|---|
| Type | PO Box only (no street delivery) |
| Status | Active |
| City | Saint Marie |
| Also accepted | Glasgow |
| State | Montana (MT) |
| County | Valley County |
| Time zone | Mountain Time · now |
| Area code | 406 |
| Coordinates | 48.4039, -106.5428 map |
| 3-digit prefix | 592 |
Population and income in 59231
| Population | 306 · lower than 63% of Montana ZIP codes |
|---|---|
| People per square mile | 551 · higher than 98% of Montana ZIP codes |
| Median age | 37.9 years · lower than 80% of Montana ZIP codes |
| Men / women | 30% / 70% |
| Median household income | $38,971 · lower than 95% of Montana ZIP codes |
| Income per person | $16,911 |
| Below the poverty line | 24% |
| Bachelor’s degree or higher | 23% of adults 25+ |
| Median home value | $18,800 · lower than 100% of Montana ZIP codes |
| Housing units | 688 |
| Households | 92 (3.33 people on average) |
| Owners / renters | 89% / 11% |
| Land area | 0.56 sq mi |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 59231. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 59231
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 59230 | Glasgow, MT | 14.2 mi S | Standard |
| 59244 | Larslan, MT | 17.1 mi NE | Standard |
| 59273 | Vandalia, MT | 17.2 mi W | Standard |
| 59248 | Nashua, MT | 20.6 mi SE | Standard |
| 59241 | Hinsdale, MT | 21.4 mi W | Standard |
| 59225 | Frazer, MT | 24.6 mi E | Standard |
| 59260 | Richland, MT | 25.8 mi NE | Standard |
| 59223 | Fort Peck, MT | 27.6 mi S | Standard |
| 59250 | Opheim, MT | 33.2 mi N | Standard |
| 59240 | Glentana, MT | 33.5 mi NE | Standard |
| 59253 | Peerless, MT | 42.8 mi NE | Standard |
| 59261 | Saco, MT | 43.7 mi W | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 59231 or measure the distance to another ZIP code.
How to address mail to 59231
PO BOX 123
SAINT MARIE MT 59231
Put the city, the two-letter state code and the ZIP code on the last line. USPS also accepts GLASGOW as the city name for 59231. Avoid St Marie: USPS doesn’t recognize it as the city for this ZIP code. Adding the 4-digit ZIP+4 code (59231-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 59231?
- 59231 is a Saint Marie, Montana ZIP code. Glasgow is also accepted as the city name.
- What county is 59231 in?
- ZIP code 59231 is in Valley County, Montana.
- What time zone is ZIP code 59231 in?
- 59231 is in the Mountain Time zone (America/Denver).
- What area code is 59231?
- Phone numbers in ZIP code 59231 use area code 406.
- What is the population of ZIP code 59231?
- About 306 people live in ZIP code 59231, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 59231?
- The median household income in 59231 is $38,971 a year, lower than 95% of Montana ZIP codes.
- Can I use 59231 for a street address?
- No. 59231 is only for PO Boxes. Street addresses in Saint Marie use another ZIP code.
- What ZIP codes are near 59231?
- The nearest ZIP codes to 59231 are 59230 (Glasgow, 14.2 miles), 59244 (Larslan, 17.1 miles), 59273 (Vandalia, 17.2 miles) and 59248 (Nashua, 20.6 miles).