| City: | Gainesville, Virginia |
| County: | Prince William County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 9:51:09 PM |
| Population: | No Population Data |
| Area Codes: | 571 / 703 |
| Classification: | PO Box |
| Coordinates: | 38.8283, -77.6248 |
| Quick Link: |
ZIP code 20156 serves the PO Box customers of Gainesville, Virginia, a growing town in Prince William County about 35 miles west of Washington, DC. The post office maintains 268 PO Boxes at its Lee Highway facility, while street delivery in Gainesville uses the neighboring 20155 ZIP code. This split arrangement is common in communities that expanded beyond their original post office footprint.
The 20156 designation handles primarily business mail for the 160 commercial customers along the Lee Highway corridor. The single street in this ZIP's service area, Lee Highway (US Route 29), forms the historic commercial spine of Gainesville. Two city carrier routes serve 49 delivery points, many with unit designations suggesting small professional offices or retail suites. Gainesville's rapid growth as a Washington suburb means most residential neighborhoods get mail through the standard 20155 ZIP, while 20156 provides PO Box service for businesses preferring a stable mailing address despite location changes.
Lee Highway (US Route 29) is the only street in this ZIP code's delivery area. As a historic north-south corridor connecting Washington, DC to the Shenandoah Valley, Lee Highway has long been Gainesville's commercial center. The 49 delivery records with unit designations suggest converted retail spaces now housing professional offices, medical practices, and service businesses typical of suburban highway corridors.
ZIP Code 20156 supports both business and residential activity. According to the Business Census (2024), there are 15 business establishments, employing about 67 people with an annual payroll of $3,112,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 4,073Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 15Source: CBP |
| 1st Quarter Payroll: | $658,000Source: CBP |
| Annual Payroll: | $3,112,000Source: CBP |
| # of Employees: | 67Source: CBP |
ZIP Code 20156 is located in Prince William County, Virginia, within the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area (CBSA 47900) and Virginia's 10th Congressional District. This Metro area has a population of 5,582,170 people, about 0.00% of whom live in ZIP Code 20156, and is subdivided into the Arlington-Alexandria-Reston, VA-WV division. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Washington-Arlington-Alexandria, DC-VA-MD-WVSource: Census |
| CBSA Number: | 47900Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | Arlington-Alexandria-Reston, VA-WV (CBSA Div 11694)Source: Census |
| CBSA Population: | 5,582,170Source: Census |
| MSA: | Washington-Baltimore, DC-MD-VA-WV CMSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 10Source: USPS |
| Congressional Land Area: | 1372.24 sq miSource: Census |
| PMSA: | Washington, DC-MD-VA-WV PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 5130176Source: Census |
| Place Name: | Gainesville CDP; VirginiaSource: Census |
We could not locate which school district 20156 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.