🇺🇸 United States ZIP Code

STANDARD

20171

Herndon

ZIP Code 20171 is a standard zip code serving Herndon, Herndon, Virginia (VA), in Fairfax County, United States. It has an estimated population of 45,887 with a median household income of $141,433. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Virginia (VA)
County: Fairfax
City: Herndon
Timezone: America/New_York

Coordinates

Latitude: 38.925200
Longitude: -77.392800

Geographic Details

Land Area: 12.10 mi²
Water Area: 0.07 mi²
Population Density: 3791.0 people per mi² (90th percentile)
Bounding Box: 38.962604°N, 38.884419°S, -77.353026°E, -77.429690°W

With 45,887 residents spread across 12.10 square miles, this area has a population density of 3791.0 people per square mile.

Demographics

45,887

Population

95th percentile

$141,433

Median Income

95th percentile

$545,700

Median Home Value

95th percentile

12.10 mi²

Land Area

The median household income in 20171 is $141,433, and the median home value is $545,700. This places the area in the top 25% nationally for household income.

Housing

16,823

Total Units

16,256

Occupied Units

96.6%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Herndon, VA.

20170

Herndon

20172

Herndon

20192

Herndon

22095

Herndon

Similar ZIP Codes in Virginia

ZIP codes with similar median household income in Virginia.

20136

Bristow

$128,444

22315

Alexandria

$128,008

22124

Oakton

$156,912

20165

Sterling

$129,827

22180

Vienna

$127,205

20141

Round Hill

$124,180

20194

Reston

$131,926

22032

Fairfax

$128,483

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.