| District of Maryland area codes: 443 | |
|---|---|
| Country | United States |
| State/Province | Maryland |
| Major City | Baltimore |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 443-200 | Baltimore City | Baltimore, MD | Allegiance Telecom |
| 443-201 | Carroll | Westminster, MD | Cellco Partnership DBA Verizon Wireless |
| 443-202 | Baltimore City | Baltimore, MD | Cellco Partnership DBA Verizon Wireless |
| 443-203 | Anne Arundel | West River, MD | Verizon Maryland |
| 443-204 | Baltimore | Pikesville, MD | New Cingular Wireless PCS - DC |
| 443-205 | Dorchester | Cambridge, MD | Sprint Spectrum L.p. |
| 443-206 | Cecil | Perryville, MD | Cellco Partnership DBA Verizon Wireless |
| 443-207 | Cecil | Elkton, MD | Omnipoint Communications Enterprises, L.p. |
| 443-208 | Baltimore | Essex, MD | Sprint Spectrum L.p. |
| 443-209 | Harford | Havre De Grace, MD | Cavalier Telephone (mid-atlantic) |
| 443-210 | Harford | Aberdeen, MD | Sprint Spectrum L.p. |
| 443-212 | Baltimore | Sparks Glencoe, MD | Us Lec Of Maryland |
| 443-213 | Baltimore City | Baltimore, MD | Verizon Maryland |
| 443-214 | Anne Arundel | Annapolis, MD | New Cingular Wireless PCS - DC |
| 443-215 | Kent | Chestertown, MD | Core Communications |
| 443-216 | Baltimore | Dundalk, MD | Cavalier Telephone Mid-atlantic |
| 443-217 | Anne Arundel | Annapolis, MD | Core Communications |
| 443-218 | Baltimore | Reisterstown, MD | Global Crossing Local Services-md |
| 443-219 | Baltimore City | Baltimore, MD | Level 3 Communications |
| 443-220 | Baltimore City | Baltimore, 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.