🇺🇸 United States ZIP Code

STANDARD

21403

Annapolis

ZIP Code 21403 is a standard zip code serving Annapolis, Annapolis, Maryland (MD), in Anne Arundel County, United States. It has an estimated population of 30,269 with a median household income of $83,056. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Maryland (MD)
County: Anne Arundel
City: Annapolis
Timezone: America/New_York

Coordinates

Latitude: 38.952400
Longitude: -76.491000

Geographic Details

Land Area: 9.09 mi²
Water Area: 4.74 mi²
Population Density: 3332.0 people per mi² (90th percentile)
Bounding Box: 38.979212°N, 38.903932°S, -76.447195°E, -76.541842°W

With 30,269 residents spread across 9.09 square miles, this area has a population density of 3332.0 people per square mile.

Demographics

30,269

Population

90th percentile

$83,056

Median Income

90th percentile

$418,100

Median Home Value

90th percentile

9.09 mi²

Land Area

The median household income in 21403 is $83,056, and the median home value is $418,100. This places the area in the top 25% nationally for household income.

Housing

14,329

Total Units

12,976

Occupied Units

90.6%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Annapolis, MD.

21401

Annapolis

21402

Annapolis

21404

Annapolis

21405

Annapolis

21409

Annapolis

21411

Annapolis

21412

Annapolis

Similar ZIP Codes in Maryland

ZIP codes with similar median household income in Maryland.

20634

Great Mills

$79,944

20724

Laurel

$89,215

21711

Big Pool

$70,870

21053

Freeland

$90,361

21917

Colora

$85,234

21162

White Marsh

$80,341

21157

Westminster

$71,826

21756

Keedysville

$86,250

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.