The original community of Pasadena, shown on USGS topographic maps at the intersection of Pasadena Road and Governor Ritchie Highway (Maryland Route 2), is now assigned by the U.S. Census Bureau to the Severna Park census-designated place, south of the border for the Pasadena CDP, which itself is centered along Mountain Road (Maryland Route 177) and includes the neighborhoods of Ashburn and Green Haven, and extends north along Marley Neck all the way to the Baltimore city line. Claim this business Favorite Share More Directions Sponsored Topics. Pasadena (626) 792-2378. Pasadena is a census-designated place (CDP) in Anne Arundel County, Maryland, United States. There were 8,546 households, out of which 33.6% had children under the age of 18 living with them, 58.6% were married couples living together, 11.3% had a female householder with no husband present, and 24.7% were non-families. View details, map and photos of this townhouse property with 3 bedrooms and 2 total baths. Best Places to Live in Pasadena, Maryland Large city - East-central Maryland along Chesapeake Bay, 40 miles northeast of Washington, D.C.. September, May and October are the most pleasant months in Pasadena, while January and February are the least comfortable months.