🇺🇸 United States ZIP Code

STANDARD

57631

Glenham

ZIP Code 57631 is a standard zip code serving Glenham, Glenham, South Dakota (SD), in Walworth County, United States. It has an estimated population of 361 with a median household income of $60,938. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: South Dakota (SD)
County: Walworth
City: Glenham
Timezone: America/Chicago

Coordinates

Latitude: 45.533500
Longitude: -100.271600

Geographic Details

Land Area: 156.46 mi²
Water Area: 33.18 mi²
Population Density: 2.0 people per mi²
Bounding Box: 45.759143°N, 45.246793°S, -100.172252°E, -100.430079°W

With 361 residents spread across 156.46 square miles, this area has a population density of 2.0 people per square mile.

Demographics

361

Population

10th percentile

$60,938

Median Income

75th percentile

$59,600

Median Home Value

5th percentile

156.46 mi²

Land Area

The median household income in 57631 is $60,938, and the median home value is $59,600. This places the area in the top 25% nationally for household income.

Housing

246

Total Units

165

Occupied Units

67.1%

Occupancy Rate

Similar ZIP Codes in South Dakota

ZIP codes with similar median household income in South Dakota.

57058

Salem

$55,236

57744

Hermosa

$64,688

57276

White

$55,417

57769

Piedmont

$62,132

57035

Humboldt

$64,545

57017

Colman

$62,596

57107

Sioux Falls

$55,141

57363

Mount Vernon

$56,522

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.