| City: | Washington, District of Columbia |
| Names to Avoid: | Dept Army Pentagon |
| County: | District Of Columbia County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:07:04 AM |
| Population: | No Population Data |
| Area Codes: | 202 / 771 |
| Classification: | Unique [Company/Government] |
| Coordinates: | 38.8951, -77.0369 |
| Quick Link: |
The Department of the Army operates under dedicated ZIP code 20310 at the Pentagon in Washington, D.C. As one of three military departments within the Department of Defense, the Army oversees the United States Army, the nation's largest military branch with over one million active and reserve personnel. The Secretary of the Army and Army Staff are headquartered in the Pentagon alongside other defense leadership. This postal designation has been in place for over two decades.
Postal records show 117 ZIP+4 codes routing Army correspondence, making this one of the higher-volume Pentagon ZIP codes. Census Business Patterns data shows 11 establishments with 147 employees within this ZIP. The Army was established in 1775 and is the senior military service in the U.S. armed forces. Census demographic data is not available for this ZIP. Washington is the valid mailing city for this designation.
| Establishments: | 11 |
| Employment: | 147 |
| Residential: | 0 |
| Business: | 1 |
ZIP Code 20310 supports both business and residential activity. According to the Business Census (2024), there are 10 business establishments, employing about 162 people with an annual payroll of $7,671,000. USPS data shows 0 residential mailboxes and 1 business mailboxes, reflecting local delivery coverage.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 1Source: USPS |
| Total Delivery Receptacles: | 1Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 10Source: CBP |
| 1st Quarter Payroll: | $1,427,000Source: CBP |
| Annual Payroll: | $7,671,000Source: CBP |
| # of Employees: | 162Source: CBP |
ZIP Code 20310 is located in District Of Columbia County, District of Columbia, within the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area (CBSA 47900) and District of Columbia's 98th Congressional District. This Metro area has a population of 6,263,796 people, about 0.00% of whom live in ZIP Code 20310, and is subdivided into the Washington, DC-MD 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: | Washington, DC-MD (CBSA Div 47764)Source: Census |
| CBSA Population: | 6,263,796Source: Census |
| MSA: | Washington-Baltimore, DC-MD-VA-WV CMSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 98Source: USPS |
| Congressional Land Area: | 61.40 sq miSource: Census |
| PMSA: | Washington, DC-MD-VA-WV PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 1150000Source: Census |
| Place Name: | Washington city; District of ColumbiaSource: Census |
We could not locate which school district 20310 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 January 1, 2026.