🇺🇸 United States ZIP Code

STANDARD

57787

Union Center

ZIP Code 57787 is a standard zip code serving Union Center, Union Center, South Dakota (SD), in Meade County, United States. It has an estimated population of 365 with a median household income of $29,858. The area falls within the America/Denver timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: South Dakota (SD)
County: Meade
City: Union Center
Timezone: America/Denver

Coordinates

Latitude: 44.653900
Longitude: -102.725200

Geographic Details

Land Area: 587.47 mi²
Water Area: 0.92 mi²
Population Density: 1.0 people per mi²
Bounding Box: 44.892776°N, 44.444964°S, -102.194790°E, -102.965378°W

With 365 residents spread across 587.47 square miles, this area has a population density of 1.0 people per square mile.

Demographics

365

Population

10th percentile

$29,858

Median Income

5th percentile

$123,200

Median Home Value

45th percentile

587.47 mi²

Land Area

The median household income in 57787 is $29,858, and the median home value is $123,200. This is below the national average for household income.

Housing

200

Total Units

151

Occupied Units

75.5%

Occupancy Rate

Similar ZIP Codes in South Dakota

ZIP codes with similar median household income in South Dakota.

57062

Springfield

$34,487

57069

Vermillion

$33,648

57339

Fort Thompson

$30,645

57356

Lake Andes

$31,296

57380

Wagner

$33,818

57533

Gregory

$34,000

57566

Parmelee

$27,740

57570

Rosebud

$25,278

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.