🇺🇸 United States ZIP Code

STANDARD

27577

Smithfield

ZIP Code 27577 is a standard zip code serving Smithfield, Smithfield, North Carolina (NC), in Johnston County, United States. It has an estimated population of 22,911 with a median household income of $41,386. 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: Johnston
City: Smithfield
Timezone: America/New_York

Coordinates

Latitude: 35.506800
Longitude: -78.347900

Geographic Details

Land Area: 104.11 mi²
Water Area: 0.54 mi²
Population Density: 220.0 people per mi² (60th percentile)
Bounding Box: 35.591337°N, 35.372998°S, -78.195302°E, -78.503379°W

With 22,911 residents spread across 104.11 square miles, this area has a population density of 220.0 people per square mile.

Demographics

22,911

Population

80th percentile

$41,386

Median Income

30th percentile

$134,500

Median Home Value

50th percentile

104.11 mi²

Land Area

The median household income in 27577 is $41,386, and the median home value is $134,500.

Housing

9,197

Total Units

8,351

Occupied Units

90.8%

Occupancy Rate

Similar ZIP Codes in North Carolina

ZIP codes with similar median household income in North Carolina.

27856

Nashville

$46,719

27248

Franklinville

$41,366

28694

West Jefferson

$35,476

28033

Crouse

$44,962

27980

Tyner

$41,212

27928

Creswell

$38,750

27326

Ruffin

$38,147

28732

Fletcher

$45,273

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.