🇺🇸 United States ZIP Code

STANDARD

18020

Bethlehem

ZIP Code 18020 is a standard zip code serving Bethlehem, Bethlehem, Pennsylvania (PA), in Northampton County, United States. It has an estimated population of 20,447 with a median household income of $78,938. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Pennsylvania (PA)
County: Northampton
City: Bethlehem
Timezone: America/New_York

Coordinates

Latitude: 40.669300
Longitude: -75.334900

Geographic Details

Land Area: 13.83 mi²
Water Area: 0.22 mi²
Population Density: 1478.0 people per mi² (80th percentile)
Bounding Box: 40.706284°N, 40.630434°S, -75.282548°E, -75.376393°W

With 20,447 residents spread across 13.83 square miles, this area has a population density of 1478.0 people per square mile.

Demographics

20,447

Population

80th percentile

$78,938

Median Income

90th percentile

$258,200

Median Home Value

80th percentile

13.83 mi²

Land Area

The median household income in 18020 is $78,938, and the median home value is $258,200. This places the area in the top 25% nationally for household income.

Housing

7,772

Total Units

7,549

Occupied Units

97.1%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Bethlehem, PA.

18015

Bethlehem

18016

Bethlehem

18017

Bethlehem

18018

Bethlehem

18025

Bethlehem

Similar ZIP Codes in Pennsylvania

ZIP codes with similar median household income in Pennsylvania.

19074

Norwood

$69,423

17352

New Park

$68,125

19056

Levittown

$69,314

18064

Nazareth

$75,629

19348

Kennett Square

$90,196

19070

Morton

$67,284

15116

Glenshaw

$72,083

19031

Flourtown

$82,917

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.