Delaware Highway Maps  
   Old and new road maps.
   http://www.aaroads.com/delaware/

Delaware Maps  
   The Perry-Castañeda Library Map Collection.
   http://www.lib.utexas.edu/maps/delaware.html

Data Mapping and Integration Library (DataMIL)  
   An interactive, online collaboratory to make possible continual improvement of the maps and spatial data used by decision-makers at the federal, state, county and local government levels in Delaware.
   http://www.datamil.udel.edu/