Area Codes > 443 > Central Office Codes
| Exchange | Rate Center | State | Operating Company |
|---|---|---|---|
| 443-992 | BALTIMORE | MD | LEVEL 3 COMMUNICATIONS, LLC - MD |
| 443-994 | ANNAPOLIS | MD | NEW CINGULAR WIRELESS PCS, LLC - DC |
| 443-995 | ANNAPOLIS | MD | NEW CINGULAR WIRELESS PCS, LLC - DC |
| 443-996 | CATONSVL | MD | NEW CINGULAR WIRELESS PCS, LLC - DC |
| 443-997 | BALTIMORE | MD | VERIZON MARYLAND, INC. |
| 443-998 | PARKVILLE | MD | BROADSTREET COMMUNICATIONS, INC. - MD |
| 443-999 | BALTIMORE | MD | VERIZON MARYLAND, INC. |