🇺🇸 United States ZIP Code

STANDARD

57783

Spearfish

ZIP Code 57783 is a standard zip code serving Spearfish, Spearfish, South Dakota (SD), in Lawrence County, United States. It has an estimated population of 14,290 with a median household income of $42,565. The area falls within the America/Denver timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: South Dakota (SD)
County: Lawrence
City: Spearfish
Timezone: America/Denver

Coordinates

Latitude: 44.494600
Longitude: -103.865000

Geographic Details

Land Area: 234.90 mi²
Water Area: 0.16 mi²
Population Density: 61.0 people per mi² (40th percentile)
Bounding Box: 44.604512°N, 44.199661°S, -103.659561°E, -104.056041°W

With 14,290 residents spread across 234.90 square miles, this area has a population density of 61.0 people per square mile.

Demographics

14,290

Population

75th percentile

$42,565

Median Income

35th percentile

$178,200

Median Home Value

70th percentile

234.90 mi²

Land Area

The median household income in 57783 is $42,565, and the median home value is $178,200.

Housing

7,097

Total Units

6,433

Occupied Units

90.6%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Spearfish, SD.

57799

Spearfish

Similar ZIP Codes in South Dakota

ZIP codes with similar median household income in South Dakota.

57747

Hot Springs

$40,645

57313

Armour

$46,250

57555

Mission

$36,731

57212

Arlington

$47,083

57028

Flandreau

$47,217

57070

Viborg

$41,250

57325

Chamberlain

$46,776

57442

Gettysburg

$48,108

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.