| 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 |
|---|---|---|---|
| 410-222 | Anne Arundel | Severn, MD | Verizon Maryland |
| 410-223 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-224 | Anne Arundel | Annapolis, MD | Verizon Maryland |
| 410-225 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-226 | Talbot | Oxford, MD | Verizon Maryland |
| 410-227 | Baltimore | Catonsville, MD | New Cingular Wireless PCS - DC |
| 410-228 | Dorchester | Cambridge, MD | Verizon Maryland |
| 410-229 | Baltimore | Cockeysville, MD | Verizon Maryland |
| 410-230 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-231 | Calvert | Solomons, MD | New Cingular Wireless PCS - DC |
| 410-232 | Baltimore City | Baltimore, MD | Usa Mobility Wireless |
| 410-233 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-234 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-235 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-236 | Baltimore | Towson, MD | New Cingular Wireless PCS - DC |
| 410-237 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 410-238 | Baltimore | Essex, MD | Verizon Maryland |
| 410-239 | Carroll | Hampstead, MD | Verizon Maryland |
| 410-240 | Baltimore City | Baltimore, MD | Sprint Spectrum L.p. |
| 410-241 | Baltimore City | Baltimore, MD | Cellco Partnership DBA Verizon Wireless |
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.