North Carolina Maps: http://www2.lib.unc.edu/dc/ncmaps/index.html. Sanborn Insurance Maps through 1922 are available free on this site. Click the Sanborn Maps tab.
Sanborn Maps North Carolina (http://sanborn.umi.com/), a product of ProQuest, is the most complete set of North Carolina Sanborn maps available online and includes maps after 1922. This subscription site is available in libraries throughout North Carolina through NC LIVE (www.nclive.org/). Available through the Stanly County Public Library.
Going to the Show (http://docsouth.unc.edu/gtts/) a project documenting the experience of moviegoing in North Carolina in the early 20th century, contains images of over 750 Sanborn map sheets. These map images have been stitched together and georeferenced, enabling users to compare them with maps from other years, and with recent street maps and satellite images.