Find duplexes for sale by searching on real estate listing sites such as Zillow.com, Trulia.com and LoopNet.com as well as general classifieds sites such as Craigslist.org. Some sites offer specific search options for duplexes and multifamily properties, while others require keyword searches for the term.
Zillow.com contains a special section of its site dedicated to only displaying listings for duplexes for sale, as of March 2015. This section contains the same features and functionality of the normal site, only with an added mandatory filter for duplexes. All listings displayed in this section are viewable on a map as well as in a traditional list format. When viewing the map, you can click on any pins to view detail about the duplex such as the number of bedrooms, its address, its square footage and its sale price along with pictures of the building's interior and exterior.
To view only listings for duplexes on Craigslist.org, you can either perform a keyword search for the term "duplex" or selection Duplex as a specific property type from its main filtering options. Other filter choices include price range, square footage range, number of bedrooms, number of bathrooms and post options such as those that contain pictures.