Pasadena is a census-designated place (CDP) in Anne Arundel County, Maryland, United States. The population was 24,287 at the 2010 census.
The areas of Lake Shore, Riviera Beach and Pasadena are collectively referred to as Pasadena by residents. As all areas are governed by Anne Arundel County, there is no distinction in services such as fire, police, or public schools. All three areas are encompassed by the 21122 zip code. The collective area population was at 56,441 at the 2010 census.
Pasadena is located at 39°6′46″N 76°33′7″W (39.112809, −76.551871) in northern Anne Arundel County. It is bordered to the north by the city of Baltimore, to the east by the tidal Patapsco River and by Riviera Beach, to the southeast by Lake Shore, to the south by Severna Park, and to the west by Glen Burnie. 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.
According to the United States Census Bureau, the CDP has a total area of 16.1 square miles (41.7 km2). 14.9 square miles (38.7 km2) of it is land, and 1.2 square miles (3.1 km2) of it (7.31%) is water.
As of the census of 2010, there were 24,287 people, 8,546 households, and 6,435 families residing in the CDP. The population density was 1,632.0 people per square mile (630.1/km²). There were 8,911 housing units at an average density of 611.9/sq mi (236.2/km²).