craig@aplcomm.jhuapl.edu (Craig Myers) (12/18/90)
I have just found out about an interactive 800 number for information on the 301-410 split: 800.477.4704, but I don't know if it is available outside of Maryland. It offers general information about the split and will tell you which area code an exchange will reside in. Craig Myers craig@aplcomm.jhuapl.edu
cmoore@brl.mil (VLD/VMB) (12/21/90)
I checked out some prefixes in the Columbia & Laurel areas:
596 Columbia (Laurel local service) stays in 301
792 Laurel (Baltimore-metro local service) goes into 410
776 Laurel (the "default" local service, which includes DC but not Va.)
stays in 301
992 Columbia (the "default" local service, which includes Baltimore city
but not all of Baltimore metro) goes into 410