| District of Maryland area codes: 443 | |
|---|---|
| Country | United States |
| State/Province | Maryland |
| Major City | Baltimore |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 443-464 | Harford | Churchville, MD | Broadview Networks |
| 443-465 | Baltimore | Towson, MD | Cellco Partnership DBA Verizon Wireless |
| 443-466 | Cecil | Elkton, MD | Sprint Spectrum L.p. |
| 443-467 | Baltimore City | Baltimore, MD | Leap Wireless Intl DBA Cricket Comm |
| 443-468 | Baltimore City | Baltimore, MD | Sprint Spectrum L.p. |
| 443-469 | Baltimore City | Baltimore, MD | Leap Wireless Intl DBA Cricket Comm |
| 443-470 | Baltimore | Towson, MD | Us Lec Of Maryland |
| 443-471 | Howard | Columbia, MD | Us Lec Of Maryland |
| 443-472 | Baltimore City | Baltimore, MD | Level 3 Communications |
| 443-473 | Baltimore City | Baltimore, MD | Sprint Spectrum L.p. |
| 443-474 | Baltimore | Catonsville, MD | New Cingular Wireless PCS - DC |
| 443-475 | Baltimore City | Baltimore, MD | Mci Worldcom Communications |
| 443-476 | Anne Arundel | Annapolis, MD | Verizon Maryland |
| 443-477 | Dorchester | Cambridge, MD | Cellco Partnership DBA Verizon Wireless |
| 443-478 | Baltimore City | Baltimore, MD | Cellco Partnership DBA Verizon Wireless |
| 443-479 | Prince Georges | Laurel, MD | Verizon Maryland |
| 443-480 | Kent | Chestertown, MD | Cellco Partnership DBA Verizon Wireless |
| 443-481 | Anne Arundel | Annapolis, MD | Us Lec Of Maryland |
| 443-482 | Anne Arundel | Annapolis, MD | Verizon Maryland |
| 443-483 | Harford | Cardiff, MD | Broadwing Communications. LLC |
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.