🇺🇸 United States ZIP Code

STANDARD

18603

Berwick

ZIP Code 18603 is a standard zip code serving Berwick, Berwick, Pennsylvania (PA), in Columbia County, United States. It has an estimated population of 19,320 with a median household income of $42,966. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

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

Coordinates

Latitude: 41.066500
Longitude: -76.244300

Geographic Details

Land Area: 51.56 mi²
Water Area: 1.60 mi²
Population Density: 375.0 people per mi² (65th percentile)
Bounding Box: 41.144903°N, 41.037715°S, -76.127929°E, -76.378863°W

With 19,320 residents spread across 51.56 square miles, this area has a population density of 375.0 people per square mile.

Demographics

19,320

Population

80th percentile

$42,966

Median Income

35th percentile

$115,400

Median Home Value

40th percentile

51.56 mi²

Land Area

The median household income in 18603 is $42,966, and the median home value is $115,400.

Housing

9,021

Total Units

8,215

Occupied Units

91.1%

Occupancy Rate

Similar ZIP Codes in Pennsylvania

ZIP codes with similar median household income in Pennsylvania.

15717

Blairsville

$48,675

17009

Burnham

$38,571

15558

Salisbury

$37,829

18407

Carbondale

$37,065

15345

Marianna

$42,386

15478

Smithfield

$39,967

16150

Sharpsville

$47,661

16917

Covington

$49,107

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.