American Red Cross

From Ready.gov, this page links to volunteering resources, reputable organizations to donate towards, and how to train and join a Community Emergency Response Team

If you're involved in disaster cleanup efforts, look at these guidelines from the CDC on how to take the proper precautions while doing so.

As well as threats from diseases, this resource addresses how to deal with flood water, electrical hazards, and stray animals in the disaster aftermath.

This is a coalition of national and state/local organizations involved in recovery and relief after disasters. You can use this site to find your state VOAD, which may have more specific information about volunteer opportunities.