AmeriCorps
AmeriCorps is a network of national service programs that serve through non-profits, public agencies and faith based organizations.

Charities USA
Links to various charitable organizations in the US.

Essential Information
Organization encouraging citizens to become active and engaged in their communities.

Internet Non-Profit Center
Houses information and advice about non-profit organizations.

Peace Corps
Peace Corps volunteers serve in 72 countries collaborating with local community members to work in areas like education, youth outreach and community development, the environment, and information technology.

The Foundation Center
The Foundation Center is dedicated to service grantseekers, grantmakers, researchers, policymakers, the media, and the general public.

Guidestar
The National Database of Nonprofit Organizations.

Interaction
The largest alliance of US-based international development and humanitarian nongovernmental organizations.

National Council of Nonprofit Associations
Network of state associations of non-profit organizations.