Harford Bird Club: Birding club with events, guest speakers, field trips, online newsletter, descriptions of local common species, rare bird alerts, and checklist of all species ever recorded in Harford County.
Harford County (Maryland) Genealogical Society: Preserving and disseminating information on family history and genealogy. Newsletters from 1997 and 1998.
Harford County Astronomical Society: Stargazing outings, discussion groups, and invited speakers.
Harford Habitat for Humanity: A driving force in eliminating substandard housing in Maryland by creating decent, affordable housing with partner families. Includes upcoming builds, volunteer and donation opportunities, and how to apply.
Home Partnership, Inc.: A not-for-profit agency dedicated to helping residents of Harford County, Maryland, achieve home ownership.
Humane Society of Harford County: Includes photos of animals available for adoption, donation information, and volunteer opportunities.
Knights of Columbus, Council No. 09729: The St. Ignatius Council serving Harford County, Maryland.
Wikipedia - Harford County, Maryland: Free encyclopedia. History, government, geography, demographics, cities and towns.