what state is 301 area code
North American area codes 240 and 301 are telephone area codes for the western half of Maryland. They serve Maryland's portion of the Greater Washington, D.C. , metro area, portions of southern Maryland, and the more rural areas in the western portion of the state.o free up available numbers, the suburban use of 202 was ended in 1990. Despite the presence of the Baltimore-Washington area, 301 remained the exclusive area code for Maryland for 44 years, making Maryland one of the largest states with a single area code.