🇺🇸 United States ZIP Code

STANDARD

30021

Clarkston

ZIP Code 30021 is a standard zip code serving Clarkston, Clarkston, Georgia (GA), in DeKalb County, United States. It has an estimated population of 21,989 with a median household income of $31,612. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Georgia (GA)
County: DeKalb
City: Clarkston
Timezone: America/New_York

Coordinates

Latitude: 33.810100
Longitude: -84.238800

Geographic Details

Land Area: 3.54 mi²
Water Area: 0.02 mi²
Population Density: 6217.0 people per mi² (95th percentile)
Bounding Box: 33.829248°N, 33.785126°S, -84.217582°E, -84.259716°W

With 21,989 residents spread across 3.54 square miles, this area has a population density of 6217.0 people per square mile.

Demographics

21,989

Population

80th percentile

$31,612

Median Income

10th percentile

$112,600

Median Home Value

40th percentile

3.54 mi²

Land Area

The median household income in 30021 is $31,612, and the median home value is $112,600. This is below the national average for household income.

Housing

8,963

Total Units

7,748

Occupied Units

86.4%

Occupancy Rate

Similar ZIP Codes in Georgia

ZIP codes with similar median household income in Georgia.

39834

Climax

$36,250

31404

Savannah

$31,263

30445

Mount Vernon

$30,125

30673

Washington

$29,414

31006

Butler

$28,598

31794

Tifton

$31,069

30354

Atlanta

$28,230

30906

Augusta

$34,265

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.