Virginia Service, 1-800-Volunteer.org , and VolunteerMatch.com are central clearinghouses for volunteer opportunities searchable by city & state or zip code.

Foster Grandparents connects volunteers age 60 and over with children and young people with exceptional needs.

The Extraordinaries uses the concept of micro-volunteerism to allow citizens to lend a hand via cell phone while waiting for coffee or the bus.

Network for Good is a nonprofit with a mission of getting individuals plugged in to community projects using the Web.

Servenet.org focuses on youth volunteerism.

AmeriCorps works with local and and national nonprofit groups to address critical needs in communities across America.

The Volunteer Family and Doing Good Together facilitate children volunteering with parents while simultaneously assisting local agencies plan and prepare for family volunteers.

CharityAmerica.com provides tools to donate online and to post volunteer opportunities.

OnlineVolunteering.org allows citizens to search for opportunities by zip code as well as by cause, type of service, etc.

MyGoodDeed.org was founded by 9/11 family members and friends as a source of online tools to empower individuals and organizations to make a difference in the world.

PlanetVolunteer.com links individuals wanting to volunteer with nonprofits needing help.

Global Citizens Network offers opportunities to volunteer in the U.S. and overseas.