Zip Code 20171
Herndon, Virginia — Fairfax County
📍 ZIP code 20171 is in Herndon, Fairfax County, Virginia.
ZIP code 20171 is located in Herndon, Fairfax County, Virginia. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 50,796. The area code for ZIP code 20171 is 202.
Quick Answer
Zip code 20171 is in Herndon, Virginia (Fairfax County). It has a population of 50,796, median household income of $166,154, and median home value of $770,200.
Population
50,796
Income
$166,154
Home Value
$770,200
Climate
88°F / 25°F
About Zip Code 20171
Zip code 20171 is located in Herndon, Virginia, within Fairfax County. Home to approximately 50,796 residents, this area sits at an elevation of 360 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 202.
The median household income is $166,154 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $770,200, and the cost of living index is 240 (140% above the national average of 100).
Summers average a high of 88°F while winters drop to 25°F. The area receives about 43 in of rain and 21 in of snow annually. The zip code covers 12.1 square miles of land area and 0.1 square miles of water.
Key Statistics
50,796
$166,154
$770,200
Eastern (EST/EDT)
202
360 ft
12.1 sq mi
35.8
19,221
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Compare With Nearby Zip Codes
| Metric | 20171 | 20191 | 20151 | 22033 | 20190 | 20170 |
|---|---|---|---|---|---|---|
| City | Herndon, VA | Reston, VA | Chantilly, VA | Chantilly, VA | Reston, VA | Herndon, VA |
| Population | 50,796 | 30,077 | 22,502 | 38,676 | 22,092 | 43,372 |
| Median Income | $166,154 | $141,019 | $143,422 | $134,532 | $126,928 | $157,875 |
| Home Value | $770,200 | $616,700 | $647,400 | $621,600 | $568,500 | $625,600 |
| Cost of Living | 240 | 199 | 208 | 199 | 185 | 209 |
| Median Age | 35.8 | 39.5 | 40.7 | 38.5 | 40.4 | 35.9 |
Cost of Living
100 = National Average. Herndon's cost of living is 140% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
4.6x
Demographics
Zip code 20171 has a population of 50,796 people with a median age of 35.8. There are 19,221 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Herndon (20171) population trend from 2010 to 2024
↓ -42.0%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
88°F
25°F
43 in
21 in
Herndon experiences warm summers with average highs around 88°F. Winters are cool with lows averaging 25°F. The area receives about 21 in of snow per year.
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Housing & Economy
Median Home Value
$770,200
Median Household Income
$166,154
With 19,221 housing units across 12.1 square miles, 20171 has a housing density of 1,589 units per square mile. The home price-to-income ratio is 4.6x.
Location & Geography
Latitude
38.9238°
Longitude
-77.3965°
Land Area
12.1 sq mi
Water Area
0.1 sq mi
Nearby Zip Codes
Zip codes closest to 20171 (Herndon, VA) with distances:
All Zip Codes in Herndon, VA
Other zip codes serving Herndon:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 20171's $166,154. A way to compare Herndon to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 20171 (Herndon, VA). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Herndon, Virginia?
Herndon, Virginia uses zip code 20171 along with 1 other zip codes.
What county is zip code 20171 in?
Zip code 20171 is located in Fairfax County, Virginia.
What is the population of zip code 20171?
The population of zip code 20171 is 50,796 with a median age of 35.8.
Is 20171 in Herndon, Virginia?
Yes, zip code 20171 is in Herndon, Fairfax County, Virginia. The area code is 202.
Frequently Asked Questions
What city is zip code 20171 in?
Zip code 20171 is in Herndon, Virginia. It is part of Fairfax County and uses the Eastern (EST/EDT) timezone.
What is zip code 20171?
Zip code 20171 is a U.S. postal code in Herndon, Virginia (Fairfax County). It has a population of 50,796 and covers 12.1 square miles.
What is the population of zip code 20171?
The population of zip code 20171 (Herndon, VA) is 50,796 with a median age of 35.8. There are approximately 19,221 housing units in this area.
What is the median income in zip code 20171?
The median household income in zip code 20171 (Herndon, VA) is $166,154 per year. The cost of living index is 240 (100 = national average).
What is the average home price in zip code 20171?
The median home value in zip code 20171 (Herndon, VA) is $770,200. The cost of living index is 240 compared to the national average of 100.
What county is zip code 20171 in?
Zip code 20171 is located in Fairfax County, Virginia. The primary city is Herndon.
What is the area code for zip code 20171?
Zip code 20171 in Herndon, VA uses area code 202. It is located in the Eastern (EST/EDT) timezone.
Is zip code 20171 a good place to live?
Zip code 20171 (Herndon, VA) has a cost of living index of 240 (100 = national average), a median household income of $166,154, and median home values of $770,200. The median age is 35.8. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 20171?
The cost of living index for zip code 20171 (Herndon, VA) is 240, where 100 represents the national average. This area is above the national average. Median home value: $770,200.
What schools serve zip code 20171?
Zip code 20171 in Herndon, Virginia is served by the local school district of Fairfax County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.