🇺🇸 United States ZIP Code

STANDARD

28756

Mill Spring

ZIP Code 28756 is a standard zip code serving Mill Spring, Mill Spring, North Carolina (NC), in Polk County, United States. It has an estimated population of 4,504 with a median household income of $33,740. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: North Carolina (NC)
County: Polk
City: Mill Spring
Timezone: America/New_York

Coordinates

Latitude: 35.333800
Longitude: -82.155700

Geographic Details

Land Area: 89.86 mi²
Water Area: 0.59 mi²
Population Density: 50.0 people per mi² (40th percentile)
Bounding Box: 35.448402°N, 35.277030°S, -82.040438°E, -82.305671°W

With 4,504 residents spread across 89.86 square miles, this area has a population density of 50.0 people per square mile.

Demographics

4,504

Population

55th percentile

$33,740

Median Income

15th percentile

$105,300

Median Home Value

35th percentile

89.86 mi²

Land Area

The median household income in 28756 is $33,740, and the median home value is $105,300. This is below the national average for household income.

Housing

2,400

Total Units

1,843

Occupied Units

76.8%

Occupancy Rate

Similar ZIP Codes in North Carolina

ZIP codes with similar median household income in North Carolina.

28320

Bladenboro

$33,497

28352

Laurinburg

$30,342

28439

Fair Bluff

$38,565

28420

Ash

$35,061

27922

Cofield

$37,813

27920

Buxton

$36,964

27027

Mayodan

$35,952

28654

Moravian Falls

$37,042

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.