🇺🇸 United States ZIP Code

PO BOX

59231

Saint Marie

ZIP Code 59231 is a po box zip code serving Saint Marie, Saint Marie, Montana (MT), in Valley County, United States. It has an estimated population of 264 with a median household income of $35,787. The area falls within the America/Denver timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Montana (MT)
County: Valley
City: Saint Marie
Timezone: America/Denver

Coordinates

Latitude: 48.403900
Longitude: -106.542800

Geographic Details

Land Area: 1.99 mi²
Population Density: 132.0 people per mi² (55th percentile)
Bounding Box: 48.410990°N, 48.382565°S, -106.516514°E, -106.563608°W

With 264 residents spread across 1.99 square miles, this area has a population density of 132.0 people per square mile.

Demographics

264

Population

5th percentile

$35,787

Median Income

15th percentile

$25,600

Median Home Value

1.99 mi²

Land Area

The median household income in 59231 is $35,787, and the median home value is $25,600. This is below the national average for household income.

Housing

1,001

Total Units

133

Occupied Units

13.3%

Occupancy Rate

Similar ZIP Codes in Montana

ZIP codes with similar median household income in Montana.

59016

Busby

$32,308

59034

Hardin

$40,337

59036

Harlowton

$31,062

59043

Lame Deer

$32,833

59050

Lodge Grass

$39,563

59072

Roundup

$40,927

59101

Billings

$40,820

59401

Great Falls

$39,660

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.