Groups starting with O
Central organizations whose name in the IRS file starts with O, with chapters on file and Form 15644 windows.
IRS EO BMF, posted Oct 13, 2026
111 groups. Sorted by name.
- Odc
- Off the Streets Inc
- Office and Professional Employees International Union
- Office of the Financial Institution of the State of Louisiana
- Ohio Association for Gifted Children
- Ohio Chartered Credit Unions
- Ohio Congress of Parents & Teachers
- Ohio County & Independent Agricultural Societies
- Ohio Credit Union League
- Ohio Dental Association
- Ohio Federation of Mothers of Twins Clubs Inc
- Ohio Music Education Association
- Ohio State Beekeepers Association Inc
- Ohio State Grange of Patrons of Husbandry
- Ohio State Medical Assoc Alliance
- Ohio State University Alumni Association Inc
- Ohiohealth Corporation
- Oklahoma Association for Retarded Citizens
- Oklahoma Dental Association
- Oklahoma Farm Bureau
- Oklahoma Garden Clubs
- Oklahoma Home and Community Education Inc
- Oklahoma Nurses Association
- Oklahoma Prescribed Burn Association
- Oklahoma Public Employees Association
- Oklahoma Society of Certified Public Accountants
- Old Spanish Trail Association
- Omega Chi Epsilon Chemical Engineering Honor Society
- Omega Psi Phi Fraternity
- Omicron Kappa Upsilon Honorary Dental Society Supreme
- Oncology Nursing Society
- One Family Inc
- One Two Dream Inc
- Operation Friendship of America Inc
- Operative Plasterers & Cement Masons International Association
- Opportunities Industrialization Center of America Inc
- Optimist International
- Oracle Religious Association
- Order Italian Sons and Daughters of America
- Order of Eastern Star Grand Chapter of Virginia
- Order of Eastern Star of Montana
- Order of Eastern Star of New York
- Order of Eastern Star of Oklahoma
- Order of Eastern Star of Texas
- Order of Eastern Star of West Virginia
- Order of Eastern Star Prince Hall Affiliation of Louisiana
- Order of the Alhambra Inc
- Order of the Amaranth Inc Supreme Council
- Order of the Eastern Star
- Order of the Eastern Star Georgia Grand Chapter
- Order of the Eastern Star Inc
- Order of the Eastern Star of Alabama Grand Chapter
- Order of the Eastern Star of Arizona Grand Chapter
- Order of the Eastern Star of Calif Prince Hall Rite of Adoption
- Order of the Eastern Star of Colorado Grand Chapter
- Order of the Eastern Star of Delaware Grand Chapter
- Order of the Eastern Star of District of Columbia Grand Chapter
- Order of the Eastern Star of Florida Grand Chapter
- Order of the Eastern Star of Georgia Prince Hall Grand Chapter
- Order of the Eastern Star of Idaho Grand Chapter
- Order of the Eastern Star of Illinois
- Order of the Eastern Star of Kentucky
- Order of the Eastern Star of Louisiana Grand Chapter
- Order of the Eastern Star of Maine
- Order of the Eastern Star of Maryland Grand Chapter
- Order of the Eastern Star of Michigan
- Order of the Eastern Star of Minnesota Grand Chapter
- Order of the Eastern Star of Mississippi Grand Chapter
- Order of the Eastern Star of Missouri Grand Chapter
- Order of the Eastern Star of Nebraska Grand Chapter
- Order of the Eastern Star of Nevada 1933
- Order of the Eastern Star of New Hampshire Grand Chapter
- Order of the Eastern Star of North Dakota Grand Chapter
- Order of the Eastern Star of Ohio & Jurisdiction Prince Hall Affiliati
- Order of the Eastern Star of Ohio Grand Chapter
- Order of the Eastern Star of Rhode Island Grand Chapter
- Order of the Eastern Star of South Carolina Grand Chapter
- Order of the Eastern Star of South Dakota
- Order of the Eastern Star of Utah Grand Chapter
- Order of the Eastern Star of VT
- Order of the Eastern Star of Washington Grand Chapter
- Order of the Eastern Star of Washington Prince Hall Grand Chapt
- Order of the Founders & Patriots of America
- Order of the Militia Crucifera Evangelica
- Order of the White Shrine of Jerusalem
- Order of United Commercial Travelers of America
- Order Sons of Hermann of the State of Connecticut
- Oregon 4-H Foundation
- Oregon Association of Minority Entr Epreneurs
- Oregon Association of Tax Consultants
- Oregon Band of Brothers
- Oregon Chapter International Association of Arson Investigators
- Oregon Education Association
- Oregon High School Rodeo Association Inc
- Oregon Hunters Association
- Oregon Medical Association
- Oregon Small Woodlands Association
- Oregon State Grange Patrons of Husbandry
- Oregon Youth Football Association
- Organization of Chinese American Women Inc
- Organization of Chinese Americans Inc
- Organization of Pakistani Entrepreneurs of North America Inc
- Organizations Concerned About Rural Education Inc
- Ozark Action Inc
- The Oasis Institute
- The Ohio Masonic Home
- The Ohio State University
- The One Foundation Inc
- The Onestar Foundation
- The Oregon State Federation of Garden Clubs Inc
- The Outdoor Circle