MIDCOR: Madison Jefferson County Industrial Development
- Organization devoted to promoting new business development in the county. Includes information on local infrastructure, workforce, education, business climate and market access.
- http://www.midcor.com/

County Genealogy
- Part of the INGenWeb project. Queries, pictures, historical records, other resources.
- http://myindianahome.net/gen/jeff/

Madison and Jefferson County Indiana
- Extensive resources and links, including information on local businesses and governmental bodies.
- http://www.madisonindiana.org/

Community Foundation of Madison and Jefferson County
- Providers of donor assistance aimed at enhancing life in the county. Endowment and grant information, news and press releases.
- http://www.cfmjc.org/

Jefferson County Land Title Corporation
- Agency providing the local real estate industry with title reports, insurance and other services. Site features prices, online ordering, contact information.
- http://www.jclt.com/

The Political Graveyard
- Information on the political history, cemeteries and memorial sites in the county.
- http://politicalgraveyard.com/geo/IN/JF.html

Jefferson Community Federal Credit Union
- Low-cost financial institution serving the county and neighboring Kentucky. Services, rates, corporate information, how to join.
- http://www.jcfcu.com/