| District of Maryland area codes: 443 | |
|---|---|
| Country | United States |
| State/Province | Maryland |
| Major City | Baltimore |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 443-956 | Baltimore City | Baltimore, MD | New Cingular Wireless PCS - DC |
| 443-957 | Baltimore City | Baltimore, MD | AT&T Local |
| 443-960 | Anne Arundel | Glen Burnie, MD | Cellco Partnership DBA Verizon Wireless |
| 443-962 | Anne Arundel | Glen Burnie, MD | Cellco Partnership DBA Verizon Wireless |
| 443-963 | Baltimore City | Baltimore, MD | Halo Wireless Services |
| 443-964 | Calvert | North Beach, MD | Level 3 Communications |
| 443-965 | Baltimore City | Baltimore, MD | Sprint Spectrum L.p. |
| 443-966 | Harford | Fallston, MD | Cellco Partnership DBA Verizon Wireless |
| 443-967 | Cecil | North East, MD | Verizon Maryland |
| 443-968 | Calvert | Prince Frederick, MD | New Cingular Wireless PCS - DC |
| 443-969 | Baltimore | Essex, MD | Cavalier Telephone Mid-atlantic |
| 443-970 | Baltimore City | Baltimore, MD | Cellco Partnership DBA Verizon Wireless |
| 443-971 | Carroll | Taneytown, MD | Bandwidth.com Clec |
| 443-972 | Dorchester | Cambridge, MD | Us Lec Of Maryland |
| 443-973 | Anne Arundel | Baltimore, MD | Xo Maryland |
| 443-974 | Carroll | Westminster, MD | Teleport Communications America |
| 443-975 | Calvert | Prince Frederick, MD | New Cingular Wireless PCS - DC |
| 443-976 | Baltimore-washington Telephone (bwt) | ||
| 443-977 | Baltimore City | Baltimore, MD | Cellco Partnership DBA Verizon Wireless |
| 443-978 | Wicomico | Salisbury, MD | Cellco Partnership DBA Verizon Wireless |
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.