McNair is a community in Fairfax County, Virginia, home to about 22,655 people across 2.0 square miles. Its ZIP code is 20171.
Homes sold for a median of $331 per square foot in the three months ending August 2026, a seller’s market.
Mostly McNair; also Franklin Farm and Floris
Each card is that ZIP code’s whole market, including any part outside McNair. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up McNair’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Washington Dulles International Airport (IAD)4 miles away |
|---|---|
| Nearest city of 250,000+ | Washington, DC20 miles away |
| Nearest city of 1 million+ | Philadelphia, PA142 miles away |
Straight-line distances from the center of McNair; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
McNair had 21,598 residents in the 2020 census, up 23% since 2010.
It’s the 55th largest of 669 towns in Virginia by population.
Fairfax County grew from 18,580 residents in 1900 to 1,150,309 in 2020.
Fairfax County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 88°F in summer, and winter lows average 25°F. About 43.2 inches of rain and melted snow fall in a typical year, with about 21 inches of snow.
Source: NOAA 1991–2020 climate normals, Washington Dc Dulles Ap, VA weather station (4 miles away).
696,002 jobs at 31,931 businesses in Fairfax County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
173 doctors and other health care providers list an office in McNair.
Nearest hospitals
Providers with an office here
| Primary care doctors | 12 |
|---|---|
| Specialist doctors | 15 |
| Dentists | 26 |
| Nurse practitioners and physician assistants | 20 |
| Mental health providers | 39 |
| Physical and occupational therapists | 43 |
| Optometrists | 11 |
| Chiropractors | 7 |
| Pharmacies | 6 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (5 nearby)
Grocery stores (1 nearby)
Pharmacies
Libraries
Museums
Theaters and performance venues
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Fairfax County Public Schools. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Coates ElementaryHerndon | Pre-K–6 | 996 | Public | 2.3 mi |
| Crossfield ElementaryHerndon | Pre-K–6 | 513 | Public | 1.8 mi |
| Floris ElementaryHerndon | Pre-K–6 | 666 | Public | 1.4 mi |
| Fox Mill ElementaryHerndon | Pre-K–6 | 650 | Public | 0.6 mi |
| McNair ElementaryHerndon | Pre-K–2 | 520 | Public | 1.6 mi |
| Oak Hill ElementaryHerndon | Pre-K–6 | 628 | Public | 1.2 mi |
| McNair Upper ElementaryHerndon | 3–6 | 605 | Public | 1.6 mi |
| Carson MiddleHerndon | 7–8 | 1,358 | Public | 1.4 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Guidepost Montessori at HerndonHerndon | Pre-K–K | 28 | Nonsectarian | 2.0 mi |
| Nysmith School for the GiftedHerndon | Pre-K–8 | 551 | Nonsectarian | 1.5 mi |
| King Abdullah AcademyHerndon | K–12 | 913 | Nonsectarian | 1.6 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Franklin Farm, Floris, Difficult Run and Sully Square.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.