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You can order the traditional paper state indexes of USGS topographic maps from the USGS Store. The indexes are free, but there is a $5 handling charge for an order. You can also interact with these index maps in this area of the USGS Store. Double-click on an index and double-click a few times to zoom in and see your area of interest.
Another feature of the USGS Store is the Map Locator and Downloader, an online index that can help you find the topo maps you want. To find maps of an area, you can search on place names, USGS map names, or pan and zoom. When you zoom in far enough, you will see quadrangle boundaries and names. When you mark a point, you can click on the red balloon and see all current and historical USGS topographic quadrangle maps in that area. You can then click on one or more maps and download them for free or order them; prices vary by map scale. The National Map Download Client has similar features for displaying map cells and downloading maps.
For GIS users, cell indexes by state can be downloaded in several formats. These are indexes of standard cells, not published maps. They contains the cells of the primary topographic map series (historical and current) in the 50 states, Puerto Rico and Virgin Islands, Pacific Territories, and Antarctica. They also include the 3.75-minute cells that were used for Digital Orthophoto Quarter-Quad (DOQQ) product in the 1990s.
A listing of maps can be downloaded in CSV format for maps in the US Topo series and the Historical Topographic Map Collection. This file can be joined to the cell indexes above to create spatial indexes of published topographic maps. This file is updated nightly; about 75 US Topo maps are added each work day.