| District of Maryland area codes: 410 | |
|---|---|
| Country | United States |
| State/Province | Maryland |
| Major City | Baltimore |
| Time Zone | Eastern (UTC-05:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 410-323 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-324 | Baltimore | Towson, MD | Verizon Maryland |
| 410-325 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-326 | Calvert | Solomons, MD | Verizon Maryland |
| 410-327 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-328 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-329 | Baltimore | Cockeysville, MD | Verizon Maryland |
| 410-330 | Dorchester | Cambridge, MD | New Cingular Wireless PCS - DC |
| 410-331 | Howard | Elkridge, MD | Usa Mobility Wireless |
| 410-332 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-333 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-334 | Wicomico | Salisbury, MD | Verizon Maryland |
| 410-335 | Baltimore | White Marsh, MD | Verizon Maryland |
| 410-336 | Baltimore City | Baltimore, MD | New Cingular Wireless PCS - DC |
| 410-337 | Baltimore | Towson, MD | Verizon Maryland |
| 410-338 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-339 | Baltimore | Towson, MD | Verizon Maryland |
| 410-340 | Baltimore City | Baltimore, MD | New Cingular Wireless PCS - DC |
| 410-341 | Wicomico | Salisbury, MD | Verizon Maryland |
| 410-342 | Baltimore City | Baltimore, MD | Verizon Maryland |
There are 783 prefixes, In the code area, the major cities are Annapolis, MD;Arbutus, MD;Arnold, MD;Baltimore, MD. The major city is Baltimore.