| 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 |
|---|---|---|---|
| 410-978 | Baltimore | Catonsville, MD | New Cingular Wireless PCS - DC |
| 410-979 | Baltimore | Catonsville, MD | New Cingular Wireless PCS - DC |
| 410-980 | Anne Arundel | Annapolis, MD | Cellco Partnership DBA Verizon Wireless |
| 410-981 | Anne Arundel | Linthicum Heights, MD | Verizon Maryland |
| 410-982 | Baltimore City | Baltimore, MD | Quantum Telecommunications |
| 410-983 | Baltimore | Fork, MD | Verizon Maryland |
| 410-984 | Carroll | Sykesville, MD | Sprint Spectrum L.p. |
| 410-985 | Howard | Jessup, MD | Baltimore-washington Telephone (bwt) |
| 410-986 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-987 | Anne Arundel | Severn, MD | Verizon Maryland |
| 410-988 | Howard | Columbia, MD | Verizon Maryland |
| 410-989 | Harford | Churchville, MD | Verizon Maryland |
| 410-990 | Anne Arundel | Annapolis, MD | Verizon Maryland |
| 410-991 | Anne Arundel | Annapolis, MD | Cellco Partnership DBA Verizon Wireless |
| 410-992 | Howard | Columbia, MD | Verizon Maryland |
| 410-993 | Anne Arundel | Linthicum Heights, MD | Verizon Maryland |
| 410-994 | Harford | Aberdeen, MD | Verizon Maryland |
| 410-995 | Howard | Ellicott City, MD | Verizon Maryland |
| 410-996 | Cecil | Port Deposit, MD | Verizon Maryland |
| 410-997 | Howard | Columbia, 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.