It's interesting to look up local and family history in Delaware! Here are some library and genealogy resources to help you with your treasure hunt:
a. Many public libraries have Ancestry Library Edition which you can access free, in the library. This is a valuable resource for genealogy resource. Outside of libraries, Heritage Quest (owned by Ancestry.com) is also helpful.
b. The Delaware Historical Society: http://www.dehistory.org/
c. The Delaware Public Archives: http://archives.delaware.gov/ - especially their online collections and resources: https://archives.delaware.gov/public-finding-aids/ They have a contact us area, too.
d. The Delaware Genealogy Society is a statewide group that is active with events and meetings. They also provide a website for searching.
e. The Delaware Libraries' LibGuide/Genealogy Resource Guide: http://guides.lib.de.us/genealogy - This has more to offer, including books and online sources to help with the success in searching.
f. Wilmington Public Library: https://wilmington.lib.de.us/finding-information/obituary-genealogical-information/ - This library has specialists who assist with historical and genealogy searching. .
g. The National Census is linked on many resources, but this is a direct link for your convenience.
h. The Delaware Library's catalog is another source to find important resources to help with your search.