U.S. Societies & Associations (O)

Ocean Conservancy, The (formerly Center for Marine Conservation) (1972): 2029 K St. N.W., Washington, D.C. 20006. 120,000. Phone: (202) 429-5609. www.oceanconservancy.org/

Odd Fellows, Sovereign Grand Lodge, Independent Order of (1819): 422 Trade St., Winston-Salem, N.C. 27101. 460,000. Phone: (336) 725-5955. www.ioof.org.

Olympic Committee, United States (1921): One Olympic Plaza, Colorado Springs, Colo. 80909-5760. Phone: (719) 632-5551. www.olympic-usa.org.

Optimist International (1919): 4494 Lindell Blvd., St. Louis, Mo. 63108. 130,000+. Phone: (314) 371-6000. www.optimist.org.

Optometric Association, American (1898): 243 N. Lindbergh Blvd., St. Louis, Mo. 63141. 32,000. Phone: (314) 991-4100. www.aoanet.org.

Organization of American States, General Secretariat (1890): 17th St. and Constitution Ave., N.W., Washington, D.C. 20006. 35 member nations. Phone: (202) 458-3000. www.oas.org.

Ornithologists' Union, American (1883): 1313 Dolley Madison Blvd., Ste. 402, McLean, Va. 22101. 4,000. Phone: (202) 357-2051. www.aou.org.

Overeaters Anonymous, Inc. (1960): World Service Office, P.O. Box 44020, Rio Rancho, N.M. 87174–4020. 150,000. Phone: (505) 891-2664. www.oa.org.