Reference: List of Government URLs That Do Not End in .Gov or .Mil Crawled by USA.gov
These lists might be of interest to both developers and searchers.
As the U.S. government’s official web portal, we search across all federal, state, local, tribal, and territorial government websites. Most government websites end in .gov or .mil, but many end in .com, .org, .edu, or other top-level domains.
This GitHub page offers details about what is and is not included on the list
Direct to Lists via GitHub:
The GitHub lists will be updated quarterly.
We also recommend taking a look at this interactive/thesaurus version of the list.
Also Available: Federal Executive Agency Internet Domains (via Data.gov)
About Gary Price
Gary Price (firstname.lastname@example.org) is a librarian, writer, consultant, and frequent conference speaker based in the Washington D.C. metro area. He earned his MLIS degree from Wayne State University in Detroit. Price has won several awards including the SLA Innovations in Technology Award and Alumnus of the Year from the Wayne St. University Library and Information Science Program. From 2006-2009 he was Director of Online Information Services at Ask.com.