The Red Cross hotline for blood donations is (800) GIVE LIFE.
The agency has asked people willing to donate blood first to call and schedule an appointment.
To donate money to Red Cross relief efforts call (800) HELP NOW.
The Salvation Army will accept financial contributions through (800) SAL ARMY.
Federal Emergency Management Agency, which coordinated disaster relief efforts by the government, does not accept donations. Registered nurses and emergency medical services personnel in the area can call (800) 628-0193, and doctors should call (518) 431-7600 to volunteer their services.
The New York Blood Center has announced a blood emergency for the greater New York/New Jersey metropolitan area. Volunteers are asked to visit www.nybloodcenter.org for more information on how to help.
Help for Family and Friends of Victims
The Justice Department's Office of Victims of Crime has established a hotline for friends and family of victims: (800) 331-0075.
Both American Airlines and United Airlines have set up hotlines for people concerned that family members were aboard the downed planes.
American Airlines: (800) 245-0999.
United (800) 932-8555. United also said it would post any information it has on its Web site, www.united.com.
The Pentagon has set up a hotline for Pentagon employees only: 1-877-663-6772.
Sen. Hillary Clinton has offered several numbers for people with missing family members and friends: (866) 856-4167, (212) 741-4626, (212) 560-2730.
People concerned about loved ones who may have been injured in the Pentagon attack can call: (800) 984-8523, or (703) 428-0002.
Individuals hurt in the attacks can call FEMA for information about assistance: (800) 462-9029.
Family members of New York Port Authority staff can call (973) 565-5505, 5506 or 5507; relatives of firefighters can call: (718) 999-2541.
St. Vincent's Hospital in New York City is taking inquiries about possible casualties. Their number is (212) 604-7285, but the hospital asks that only family members of possible victims use the hotline.
Bellevue Hospital Center has also treated scores of casualties from the World Trade Center attacks. The facility has its own hotline number, (212) 562-7696, but warns that the system is backed up due to the number of incoming calls.
Investigators Ask for Tips
The FBI has created a Web site, http://www.ifccfbi.gov, and telephone hotline, (800) 331-0075, for information on possible victims.
Both may also be used by people to report information about the terror attacks.
Investigators are asking anyone with video or pictures of people around the World Trade Center at the time of Tuesday's attacks to call: 1 (800) 577-TIPS.