Carrier: MCI WORLDCOM COMMUNICATIONS, INC. - MD
Baldwin, Baltimore, Boring, Brooklandville, Butler, Catonsville, Chase, Cockeysville, Dundalk, Essex, Fork, Fort Howard, Freeland, Glen Arm, Glyndon, Gwynn Oak, Halethorpe, Hunt Valley, Hydes, Kingsville, Long Green, Lutherville Timonium, Maryland Line, Middle River, Monkton, Nottingham, Owings Mills, Parkton, Parkville, Perry Hall, Phoenix, Pikesville, Randallstown, Reisterstown, Riderwood, Rosedale, Sparks Glencoe, Sparrows Point, Stevenson, Towson
These telephone directories do not contain only publicly available numbers, but also numbers that are not listed else where. The data collectors of these directories retrieve phone records from several communication companies. They often have access (by paying a fee) to data made available from the telecommunication giants. These premium data are analyzed by complex computer algorithms for extracting information that might be of interest for the subscribers of these premium reverse phone directories. They also gather information from public people records, social networking sites and online communities. People often list their phone numbers in their profiles in various social media sites.