🇺🇸 United States ZIP Code

STANDARD

35603

Decatur

ZIP Code 35603 is a standard zip code serving Decatur, Decatur, Alabama (AL), in Morgan County, United States. It has an estimated population of 30,545 with a median household income of $52,382. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Alabama (AL)
County: Morgan
City: Decatur
Timezone: America/Chicago

Coordinates

Latitude: 34.548400
Longitude: -87.000400

Geographic Details

Land Area: 70.36 mi²
Water Area: 6.68 mi²
Population Density: 434.0 people per mi² (70th percentile)
Bounding Box: 34.600917°N, 34.476271°S, -86.800302°E, -87.114395°W

With 30,545 residents spread across 70.36 square miles, this area has a population density of 434.0 people per square mile.

Demographics

30,545

Population

90th percentile

$52,382

Median Income

60th percentile

$164,600

Median Home Value

65th percentile

70.36 mi²

Land Area

The median household income in 35603 is $52,382, and the median home value is $164,600.

Housing

13,386

Total Units

12,554

Occupied Units

93.8%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Decatur, AL.

35601

Decatur

35602

Decatur

35609

Decatur

35699

Decatur

Similar ZIP Codes in Alabama

ZIP codes with similar median household income in Alabama.

35463

Fosters

$58,750

35178

Vincent

$51,434

35035

Brierfield

$55,586

36005

Banks

$46,923

35096

Lincoln

$45,233

35019

Baileyton

$54,342

35670

Somerville

$44,741

36874

Salem

$49,872

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.