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You can order the good old-fashioned paper versions of the state by state indexes of USGS topographic maps online 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 Viewer has similar features for displaying map cells and downloading maps.
For GIS users, a cell index can be downloaded in Esri file geodatabase format. This is an index of standard cells, not published maps. It 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. It also includes 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 index above to create spatial indexes of published topographic maps. This file is updated nightly; about 70 US Topo maps are added each work day.