ZIP Code 20156 is located in Gainesville Virginia. 20156 is entirely within Prince William County. Regionally, it is located in Metro DC.
| ZIP Code Name | Gainesville |
| Primary County | Prince William County |
| ZIP Code Type | PO Box |
| Current Time | EDT |
| Coordinates | 38.79140472,-77.62926483 |
| Adjacent ZIP Codes | |
| Region | Metro DC |
| Metropolitan/Micropolitan Stat Area | Washington-Arlington-Alexandria, DC-VA-MD-WV |
| Time Zone | Eastern Daylight Time |
| IANA Timezone | America/New_York |
| US Congressional Districts in 20156 | |
| Virginia State Senate Districts in 20156 | |
| Virginia House of Delegates Districts in 20156 |
| School Districts in 20156 | |
| Elementary Schools in 20156 | |
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| High Schools in 20156 |