🇺🇸 United States ZIP Code

STANDARD

57755

Ludlow

ZIP Code 57755 is a standard zip code serving Ludlow, Ludlow, South Dakota (SD), in Harding County, United States. It has an estimated population of 116 with a median household income of $50,417. The area falls within the America/Denver timezone.

Median Household Income vs. National Average

Location

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

Coordinates

Latitude: 45.836600
Longitude: -103.349100

Geographic Details

Land Area: 224.87 mi²
Water Area: 0.21 mi²
Population Density: 1.0 people per mi²
Bounding Box: 45.945377°N, 45.732937°S, -103.065506°E, -103.583321°W

With 116 residents spread across 224.87 square miles, this area has a population density of 1.0 people per square mile.

Demographics

116

Population

$50,417

Median Income

55th percentile

$145,800

Median Home Value

55th percentile

224.87 mi²

Land Area

The median household income in 57755 is $50,417, and the median home value is $145,800.

Housing

Total Units

Occupied Units

68.2%

Occupancy Rate

Similar ZIP Codes in South Dakota

ZIP codes with similar median household income in South Dakota.

57001

Alcester

$55,278

57311

Alexandria

$52,308

57732

Deadwood

$49,375

57368

Plankinton

$50,192

57201

Watertown

$46,681

57313

Armour

$46,250

57053

Parker

$53,672

57022

Dell Rapids

$56,081

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.