| City: | Chewsville, Maryland |
| County: | Washington County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 10:02:09 PM |
| Population: | No Population Data |
| Area Codes: | 227 / 240 / 301 |
| Classification: | PO Box |
| Coordinates: | 39.6472, -77.6308 |
| Quick Link: |
The postal infrastructure includes one street route and one rural route, with Twin Springs Drive being the only named street in the ZIP+4 database. Seven ZIP+4 codes serve the area, split between three street records and four PO Box records. The classification as a small town hub reflects the post office's role in providing PO Box service for the immediate area rather than serving as a regional destination.
Only one street appears in the ZIP+4 database—Twin Springs Drive with two delivery records. The minimal street infrastructure reflects the area's rural character and small geographic footprint.
ZIP Code 21721 is designated for PO Box delivery only; business establishment and employment data are not available.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 70Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 0Source: CBP |
| 1st Quarter Payroll: | $0Source: CBP |
| Annual Payroll: | $0Source: CBP |
| # of Employees: | 0Source: CBP |
ZIP Code 21721 is located in Washington County, Maryland, within the Hagerstown-Martinsburg, MD-WV Metropolitan Statistical Area (CBSA 25180) and Maryland's 6th Congressional District. This Metro area has a population of 269,140 people, about 0.00% of whom live in ZIP Code 21721. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Hagerstown-Martinsburg, MD-WVSource: Census |
| CBSA Number: | 25180Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 269,140Source: Census |
| MSA: | Washington-Baltimore, DC-MD-VA-WV CMSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 06Source: USPS |
| Congressional Land Area: | 1950.26 sq miSource: Census |
| PMSA: | Hagerstown, MD PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 2416800Source: Census |
| Place Name: | Chewsville CDP; MarylandSource: Census |
We could not locate which school district 21721 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.