| District of Maryland area codes: 443 | |
|---|---|
| Country | United States |
| State/Province | Maryland |
| Major City | Baltimore |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 443-362 | Talbot | Easton, MD | Omnipoint Communications Cap Operations |
| 443-363 | Anne Arundel | Severn, MD | Xo Maryland |
| 443-364 | Baltimore City | Baltimore, MD | Teleport Communications America |
| 443-365 | Wicomico | Salisbury, MD | Omnipoint Communications Cap Operations |
| 443-366 | Wicomico | Salisbury, MD | Sprint Spectrum L.p. |
| 443-367 | Howard | Columbia, MD | Verizon Maryland |
| 443-368 | Carroll | Westminster, MD | Core Communications |
| 443-369 | Harford | Bel Air, MD | Core Communications |
| 443-370 | Anne Arundel | Annapolis, MD | New Cingular Wireless PCS - DC |
| 443-371 | Harford | Bel Air, MD | Broadwing Communications. LLC |
| 443-372 | Harford | Edgewood, MD | Us Lec Of Maryland |
| 443-373 | Worcester | Ocean City, MD | Sprint Spectrum L.p. |
| 443-374 | Harford | Aberdeen, MD | Cavalier Telephone (mid-atlantic) |
| 443-375 | Carroll | Hampstead, MD | Sprint Spectrum L.p. |
| 443-376 | Baltimore City | Baltimore, MD | Teleport Communications America |
| 443-377 | Baltimore | Towson, MD | Cellco Partnership DBA Verizon Wireless |
| 443-378 | Baltimore City | Baltimore, MD | Sprint Spectrum L.p. |
| 443-379 | Baltimore | Pikesville, MD | Comcast Phone Of Northern Maryland |
| 443-380 | Baltimore City | Baltimore, MD | Level 3 Communications |
| 443-381 | Baltimore | Reisterstown, MD | Xo 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.