Charlotte L. Evarts Memorial Archives, Inc.
- Private archives dedicated to preserving the town history and named for its first historian.
- http://www.evartsarchives.org/

View of Madison in 1881
- Panoramic bird's-eye view of town in 1881, from the Library of Congress Geography and Map Division.
- http://lcweb2.loc.gov/cgi-bin/map_item.pl?data=/gmd378/g3784/g3784m/pm000811.sid&style=gmd&itemLink=D?gmd:18:./temp/~ammem_3PxK::&title=View+of+Madison,+Conn.+1881.+

East Guilford
- Contemporary color photographs of historic architecture and gravestones in West Cemetery.
- http://cyndy.smugmug.com/gallery/15467

The Madison Foundation, Inc.
- Nonprofit community foundation serving the residents of the town.
- http://www.themadisonfoundation.org/