More than 99.8% of the items in the Map Room are cataloged, and are available through the Library's online catalog Catalyst.

The easiest way to search for a map is to do a COMBINATION search in Catalyst. Use the name of the place you are looking for, like "North Table Mountain" or "Gilpin County," and the words "map?". The "?" is the truncation character. This tells the system to search for all words that begin "map"-the words could be "map" or "maps". Doing a search of "Colorado" and "map?" is too broad; it will yield more than 10,000 items. By narrowing the geographic area of your search and using the "?" symbol, you will save time.

It is also possible to browse Catalyst using call numbers. Each geographic area has a specific call number: Jefferson County, Colorado is "G4313 .J4". A list of these call numbers is located on here.

Because many maps are part of a series or set, additional indexes may be needed to locate a specific sheet. These indexes are in the white binders near the Office in the Map Room. Additional information about the indexes may be found here.

Catalyst indicates the location of the item within the Map Room. These MAP ROOM locations include: CD ROM, FICHE,  FILE CABINETS, FLAT, OFFICE, OVERSIZE, REFERENCE, RESERVE, ROLLED, and STACKS.