| District of Maryland area codes: 443 | |
|---|---|
| Country | United States |
| State/Province | Maryland |
| Major City | Baltimore |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 443-241 | Carroll | Westminster, MD | Global Naps South |
| 443-242 | Baltimore | Sparrows Point, MD | Cavalier Telephone Mid-atlantic |
| 443-243 | Harford | Fallston, MD | Cellco Partnership DBA Verizon Wireless |
| 443-244 | Carroll | Westminster, MD | Level 3 Communications |
| 443-245 | Cecil | Elkton, MD | Cavalier Telephone (mid-atlantic) |
| 443-246 | Cecil | Elkton, MD | Core Communications |
| 443-247 | Carroll | Union Bridge, MD | Ctc Communications Corp. |
| 443-248 | Baltimore | Catonsville, MD | Cellco Partnership DBA Verizon Wireless |
| 443-249 | Queen Annes | Stevensville, MD | Verizon Maryland |
| 443-250 | Baltimore City | Baltimore, MD | Sprint Spectrum L.p. |
| 443-251 | Kent | Chestertown, MD | Local Access LLC |
| 443-252 | Cecil | Perryville, MD | Cellco Partnership DBA Verizon Wireless |
| 443-253 | Baltimore City | Baltimore, MD | New Cingular Wireless PCS - DC |
| 443-254 | Anne Arundel | Annapolis, MD | Omnipoint Communications Cap Operations |
| 443-255 | Baltimore City | Baltimore, MD | New Cingular Wireless PCS - DC |
| 443-256 | Cecil | North East, MD | Ctc Communications Corp. |
| 443-257 | Baltimore City | Baltimore, MD | Cellco Partnership DBA Verizon Wireless |
| 443-258 | Talbot | Easton, MD | New Cingular Wireless PCS - DC |
| 443-259 | Howard | Columbia, MD | Verizon Maryland |
| 443-260 | Wicomico | Salisbury, MD | Verizon Maryland |
There are 781 prefixes, In the code area, the major cities are Annapolis, MD;Arbutus, MD;Arnold, MD;Baltimore, MD. The major city is Baltimore.