Zip Code 20191 — Reston, VA
20191 is a ZIP Code associated with Reston, VA, located within Fairfax. 20191 ranks #13 out of 43 ZIP codes in Fairfax County by population (and #92 out of 903 in VA). The area supports an estimated population of 31,011 residents across Data Pending housing units, with a population density of 1,543.7 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (38.934380, -77.351840)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 20191 |
| Primary City | Reston |
| State / Province | VA |
| County | Fairfax |
| Total Population | 31,011 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 1,543.7 people/sq mi |
| Timezone | America/New_York |
How 20191 Compares
| Metric | ZIP 20191 | Fairfax County | VA State Average |
|---|
| Population | 31,011 | 1,173,352 (Total) | 8,705,380 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 1,543.7 /sq mi | -- | -- |
| County Pop Rank | #13 of 43 | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →