Pioneer Valley Railroad
- Short line railroad system serving industries in the cities of Westfield and Holyoke.
- http://www.pvrr.com/general_info.html

State Representative Cele Hahn
- Weekly commentary by local Republican representative. Includes biography, photos of events, and contact information with complete archive of columns.
- http://www.celehahn.org/

Hampden County Registry of Deeds
- Recording office for real estate instruments.
- http://registryofdeeds.co.hampden.ma.us/

Hampden County Radio Association
- Membership organization of amateur radio operators which provides nonprofit public service communication support to local events, groups and schools.
- http://www.hcra.org/

MapStats: Hampden County
- Statistics for the county, including agricultural, population, immigration, demographics, business, crime, energy, and environment.
- http://www.fedstats.gov/qf/states/25/25013.html