Sully Square is a community in Fairfax County, Virginia, home to about 2,394 people across 0.8 square miles. It has no ZIP code of its own: it’s part of 20151 and 20171.
Homes sold for a median of $324 per square foot across 2 ZIP codes in the three months ending August 2026, and all of them were seller’s markets.
Mostly Chantilly; part is in Sully Square
Mostly McNair; part is in Sully Square
Each card is that ZIP code’s whole market, including any part outside Sully Square. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Sully Square’s story and what everyday life there is like, for people thinking about moving in.
Are you a local agent who knows Sully Square well? Agents who advertise here will be able to write the guide. Advertise on OfferBacked
| Nearest major airport | Washington Dulles International Airport (IAD)3 miles away |
|---|---|
| Nearest city of 250,000+ | Washington, DC21 miles away |
| Nearest city of 1 million+ | Philadelphia, PA143 miles away |
Straight-line distances from the center of Sully Square; 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.
It’s the 266th 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 (3 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).
560 doctors and other health care providers list an office in Sully Square’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 48 |
|---|---|
| Specialist doctors | 31 |
| Dentists | 71 |
| Nurse practitioners and physician assistants | 101 |
| Mental health providers | 172 |
| Physical and occupational therapists | 92 |
| Optometrists | 22 |
| Chiropractors | 23 |
| Pharmacies | 20 |
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 (6 nearby)
Grocery stores (2 nearby)
Pharmacies (1 nearby)
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 |
|---|---|---|---|---|
| Brookfield ElementaryChantilly | Pre-K–6 | 684 | Public | 2.1 mi |
| Coates ElementaryHerndon | Pre-K–6 | 996 | Public | 2.8 mi |
| Crossfield ElementaryHerndon | Pre-K–6 | 513 | Public | 2.6 mi |
| Floris ElementaryHerndon | Pre-K–6 | 666 | Public | 1.7 mi |
| Fox Mill ElementaryHerndon | Pre-K–6 | 650 | Public | 1.9 mi |
| McNair ElementaryHerndon | Pre-K–2 | 520 | Public | 2.4 mi |
| Oak Hill ElementaryHerndon | Pre-K–6 | 628 | Public | 0.1 mi |
| Poplar Tree ElementaryChantilly | Pre-K–6 | 683 | Public | 3.4 mi |
| McNair Upper ElementaryHerndon | 3–6 | 605 | Public | 2.5 mi |
| Carson MiddleHerndon | 7–8 | 1,358 | Public | 1.1 mi |
| Franklin MiddleChantilly | 7–8 | 798 | Public | 0.6 mi |
| Rocky Run MiddleChantilly | 7–8 | 882 | Public | 2.6 mi |
| Chantilly HighChantilly | 9–12 | 2,937 | Public | 2.2 mi |
| Westfield HighChantilly | 9–12 | 2,737 | Public | 3.4 mi |
| Chantilly Governor's STEM AcademyChantilly | — | — | Career and Technical | 2.2 mi |
| Chantilly High School AcademyChantilly | — | — | Career and Technical | 2.2 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Guidepost Montessori at ChantillyChantilly | Pre-K–8 | 116 | Nonsectarian | 2.7 mi |
| Guidepost Montessori at HerndonHerndon | Pre-K–K | 28 | Nonsectarian | 2.8 mi |
| Monarch Christian MontessoriChantilly | Pre-K–K | 10 | Christian (no specific denomination) | 3.2 mi |
| Montessori School of ChantillyChantilly | Pre-K–K | 17 | Nonsectarian | 2.6 mi |
| Montessori School of Chantilly IIChantilly | Pre-K–K | 48 | Nonsectarian | 3.3 mi |
| Montessori School of FairfaxChantilly | Pre-K–5 | 23 | Nonsectarian | 0.7 mi |
| Nysmith School for the GiftedHerndon | Pre-K–8 | 551 | Nonsectarian | 1.0 mi |
| Pinnacle AcademyChantilly | Pre-K–12 | 206 | Nonsectarian | 2.9 mi |
| Primrose School of ChantillyChantilly | Pre-K–K | 6 | Nonsectarian | 0.9 mi |
| St Timothy Catholic SchoolChantilly | Pre-K–8 | 637 | Roman Catholic | 2.9 mi |
| St Veronica Catholic SchoolChantilly | Pre-K–8 | 369 | Roman Catholic | 0.8 mi |
| The Goddard SchoolChantilly | Pre-K–K | 112 | Nonsectarian | 3.5 mi |
| King Abdullah AcademyHerndon | K–12 | 913 | Nonsectarian | 1.4 mi |
| The Auburn SchoolChantilly | K–12 | 14 | Nonsectarian | 2.1 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 Chantilly, McNair, Franklin Farm, Floris, Difficult Run and Centreville.
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.