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Regions are composed of groups, intergroups, and service boards within specified geographic boundaries and the virtual community. OA is divided into ten regions.
- OA Region One
Pacific Northwest: Alaska, Idaho, Montana, Oregon, Washington, Wyoming, Alberta, British Columbia, Manitoba, Northwest Territories, Nunavut, Saskatchewan, and Yukon.
- OA Region Two
Pacific Southwest: California, Hawaii, Reno/Tahoe area of Nevada, and Mexico. - OA Region Three
Southwest: Arizona, Colorado, Central and West Iowa, Kansas, Nebraska, Nevada, New Mexico, Oklahoma, South Dakota, Texas, and Utah. - OA Region Four was dissolved/disbanded in July 2024 and this will be ratified at World Service Business Conference 2025.
- OA Region Five
Central: East Iowa, Illinois, Indiana, Kentucky, Michigan, Minnesota, Missouri (except the Greater Ozarks Intergroup), North Dakota, Ohio, and Wisconsin. - OA Region Six
Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, Vermont, New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario, Prince Edward Island, Quebec, and Bermuda. - OA Region Seven
Eastern: Delaware, District of Columbia, Maryland, New Jersey, Pennsylvania, Virginia, and West Virginia. - OA Region Eight
Southeast: Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, North Carolina, Puerto Rico, South Carolina, Tennessee, the Greater Ozarks Intergroup, the US Virgin Islands, the Caribbean Islands, Central America, and South America. - OA Region Nine
Countries and territories in Africa, Europe, the Middle East, and Western Asia, including all of Russia. - OA Region Ten
Countries and territories in Australia, East Asia, New Zealand, Southeast Asia, and the Western Pacific Basin. - OA Virtual Region
Nongeographic: Virtual groups and virtual intergroups.
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