ZIP Code 20189 is located in Dulles Virginia. Portions of 20189 are also in Ashburn. 20189 is entirely within Loudoun County. Regionally, 20189 is located in Metro DC.
| ZIP Code Name | Dulles |
| Primary County | Loudoun County |
| ZIP Code Type | Standard |
| Area Code(s) | 571 / 703 |
| Current Time | EDT |
| Coordinates | 39.00091171,-77.45785522 |
| Adjacent ZIP Codes | |
| Cities/Towns in 20189 | |
| Region | Metro DC |
| Metropolitan/Micropolitan Stat Area | Washington-Arlington-Alexandria, DC-VA-MD-WV |
| Time Zone | Eastern Daylight Time |
| IANA Timezone | America/New_York |
| Area | 0.20447073 Square Miles |
| School Districts in 20189 | |
| Elementary Schools in 20189 | |
| Middle Schools in 20189 | |
| High Schools in 20189 |