Overview

• The American Community Survey provides data on housing units in 10 categories. According to the American Housing Survey conducted by the US Census Bureau, these 10 categories include:
•  Detached homes: This refers to a single family detached home.
•  Attached homes: This refers to rowhouses, townhouses, and twins
•  Duplexes: This refers to two attached houses.
•  Small apartments or condos: This is further separated into three: 3 to 4, 5 to 9, and 10 to 19 homes.
•  Large apartments or condos: This is further separated into two: 20 to 49, 50 or more homes.
•  Mobile homes. 
•  Other: This refers to other housing options such as boats.

Baltimore, MD

• The total number of housing units in Baltimore is 296,727.
• These have been categorized as detached (42,170), attached (155,264), duplexes (16,373), small apartments/condos (3 to 4: 17,966, 5 to 9: 17,055, and 10 to 19: 13,431), large apartments/condos (20 to 49: 7,365 and 50+: 26,534), mobile homes (380), and others (189).

Philadelphia, PA

• The total number of housing units in Philadelphia is 670,229.
• These have been categorized as detached (54,702), attached (392,510), duplexes (58,110), small apartments/condos (3 to 4: 43,455, 5 to 9: 25,418, and 10 to 19: 14,957), large apartments/condos (20 to 49: 19,659 and 50+: 59,674), mobile homes (1,585), and others (159).

Chicago, IL

• The total number of housing units in Chicago is 1,192,544.

• These have been categorized as detached (304,277), attached (41,206), duplexes (174,740), small apartments/condos (3 to 4: 189,782, 5 to 9: 133,482, and 10 to 19: 54,229), large apartments/condos (20 to 49: 77,253 and 50+: 214,927), mobile homes (2,350), and others (298).

Summary of our Early Findings

• Our initial one-hour research was unable to acquire any information from Baltimore's property tax department. We were able to provide information from the US Census Bureau for all three cities.
• The categories provided by this survey may not provide the breakdown required.