Residential delivery area · Virginia
ZIP Code 20171: Herndon, VA
ZIP code 20171 uses the postal name Herndon, Virginia and lies entirely in Fairfax County (Census 2020 ZIP-county file). About 51,000 people live there (Census Bureau, ACS 2020-2024), the more populous of Herndon's 2 residential ZIP codes. Median household income is $171,372 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Franklin Farm (36%), Floris (24%), McNair (17%), Difficult Run (17%) and Sully Square (5%), and 2% in smaller places.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Herndon · 2 residential ZIPs
- County
- Fairfax County
- Census places
- Franklin Farm (36%) census-designated place; Floris (24%) census-designated place; McNair (17%) census-designated place; Difficult Run (17%) census-designated place
- Metro area
- Washington-Arlington-Alexandria, DC-VA-MD-WV
- House district
- VA-11 119th Congress
- State
- Virginia
- Time zone
- Eastern
- Land area
- 11.6 sq mi · 4,415 people per sq mi
Where is ZIP code 20171?
20171 centers on 38.927°, -77.397° and covers 11.6 square miles of land plus 0.1 of water. It borders 6 ZIP codes: 20191, 20151, 22033, 20170, 22124, 20166.
The map draws ZIP code areas only. For the streets inside 20171, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 20171 compare with the rest of Herndon?
| Measure | 20171 | In Herndon | In Fairfax County | In VA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 51,286 | 1st of 2 | 3rd of 47 | 24th of 903 |
| Median household income | $171k | 1st of 2 | 14th of 46 | 30th of 461 |
| Median home value | $797k | 1st of 2 | 16th of 46 | 31st of 552 |
Its median household income is higher than in 98% of U.S. residential ZIP codes, and it is denser than 93% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 20171?
The 2020 Census counted 51,759 people in 20171; the ACS, which samples households over 2020-2024, estimates 51,286. Between the 2010 and 2020 censuses its population grew 12.8% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 51,286
- 2020 Census count
- 51,759+12.8% since 2010 (45,887)
- Households
- 18,923
- Median age
- 36.2
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 20171?
Of the 51,286 people the ACS estimates in 20171, 23.1% are under 18 and 10.6% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (43.8%), then Asian (not Hispanic) (32.9%).
- Under 1823.1%
- 18 to 6466.2%
- 65 and older10.6%
- White, not Hispanic43.8%
- Asian, not Hispanic32.9%
- Hispanic or Latino8.3%
- Black, not Hispanic8.1%
- Other or two or more6.9%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 20171 earn?
Median household income is $171,372 (ACS 2020-2024), the 14th highest of the 46 ranked ZIP codes in Fairfax County. It is not measurably different from 2015-2019 ($177,208 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $171,372
- Income per person
- $77,217
- Below the poverty line
- 3.6%
- Unemployed (of the labor force)
- 2.7%
- Adults 25+ with a bachelor's degree
- 75.0%
- Adjusted gross income per tax return, 2022
- $162,22526,350 returns; wages 74% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 20171?
FHFA's house price index for 20171, built from repeat sales and appraisals of the same homes, rose 54% from 2015 to 2025 and rose 37% from 2020 to 2025, and moved +7.6% in 2025.
- Median home value (owners' estimate)
- $797,200
- Median gross rent
- $2,304
- Homes owned by their occupants
- 56.9%
- Housing units
- 19,696
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 20171?
1,725 business establishments had a location in this ZIP code in 2023, 146 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services873
- Administrative and support and waste management and remediation services118
- Health care and social assistance95
- Accommodation and food services83
- Information80
- Real estate and rental and leasing79
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 20171?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 20191 | Reston | 31,011 | $151k | 2.5 mi |
| 20151 | Chantilly | 22,610 | $158k | 3.3 mi |
| 22033 | Fairfax | 39,526 | $144k | 3.6 mi |
| 20170 | Herndon | 43,866 | $160k | 3.8 mi |
| 22124 | Oakton | 18,091 | $218k | 4.2 mi |
| 20166 | Sterling | 14,949 | $133k | 4.7 mi |
| 20190 | Reston | 22,012 | $135k | 3.7 mi (near) |
| 20194 | Reston | 12,275 | $171k | 4.8 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.