The Map Collection is available for review in Corona Heritage Online. The collection consists of draft, topographic, plat, and project maps for the South Riverside/ Corona region. In addition to the Corona maps, there are materials that include other regions of Riverside County, San Bernardino County, as well as Southern California. Included in the collection is an 1868 Plat map of Rancho La Sierra confirmed by Bernardo Yorba, a 1911 Sanborn Fire Insurance Map, an 1877 map of Auburndale Colony, and a map of the Pacific Electric Railway System. The collection spans the mid-1800s to the 2000s with the bulk of the collection from the 1950s and 1960s.

There are also map books and atlases in the Heritage Room's Book Collection. The Renie Atlas for Riverside and San Bernardino Counties and several Thomas Guides are located there.