Australia
All
Canada
Alberta
- Society of Edmonton Atheists
- Society for Secular Humanists in Calgary
- Universal Church Triumphant of the Apathetic Agnostic
British Columbia
- British Columbia Humanist Association
- British Columbia Skeptics Society
- Victoria Secular Humanist Association
Ontario
- Central Ontario Humanist Association (Barrie)
- Humanist Association of Ottawa
- Humanist Association of Toronto
- Ontario Skeptics Society for Critical Inquiry
- Ottawa Skeptics
- Society of Ontario Freethinkers
Québec
- Brights Québec
- Humanist Association of Québec
- Sceptiques du Québec
Ireland
All
- Belfast Humanist Group
- Humanist Association of Northern Ireland
Netherlands
Scotland
United Kingdom
All
- Birmingham Humanists
- Cambridge Humanist Group
- Chiltern Humanists
- Cornwall Humanists
- Ealing Humanist Association
- Greater Manchester Humanists
- Hampstead Humanist Society
- Harrow Humanist Society
- Humanists in Wales
- North East Humanists
- Nottingham Secular Society
- Sheffield Humanist Society
- Suffolk Humanists
United States of America
Alabama
- Alabama Freethought Association
- Birmingham Freethought Society
- Florence Nontheists
- Humanists Association of the Tennessee Valley
- Montgomery Area Freethought Association
- North Alabama Freethought Association
Alaska
- No known groups with websites.
Arizona
- Center for Inquiry Community of Southern Arizona
- Flagstaff Freethinkers
- Humanists of Prescott
- Tucson Atheists
- Tucson Secular Families
Arkansas
- Central Arkansas Freethinkers Discussion Group
- Fayetteville Freethinkers
California
- Atheist Coalition of San Diego
- Atheists of North County San Diego
- Atheists and Other Freethinkers (Sacramento)
- Atheists of the San Francisco Region
- Atheists of Silicon Valley
- Atheists United (Los Angeles)
- Bay Area Skeptics (San Francisco)
- Center for Inquiry Community of Orange County
- Center for Inquiry Community of South Bay/Long Beach
- Center for Inquiry – San Francisco
- Center for Inquiry – West
- East Bay Atheists
- East Bay Skeptics Society (Albany/Oakland)
- Fellowship of Humanity
- Freethinkers Toastmasters
- Freethinkers of Ventura County
- Humanist Association of the Greater Sacramento Area
- Humanist Association of Los Angeles
- Humanist Association of Orange County
- Humanist Association of San Diego
- Humanist Community (San Francisco Penninsula to Silicon Valley and San Jose)
- Humanist Fellowship of San Diego
- Humanist Society of Santa Barbara
- Humanists of the San Joaquin Valley
- Independent Investigations Group (Hollywood)
- Sacramento Atheists and Independent Thinkers Alliance
- Sacramento Organization for Rational Thinking
- San Diego Association for Rational Inquiry
- San Francisco Atheists
- Shasta Atheists and Freethinkers
Colorado
- Atheists and Freethinkers of Denver
- Boulder Atheists
- Denver Atheists
- Denver Skeptics
- Freethinkers of Colorado Springs
- Freethinkers of Northern Colorado
- Humanist Action League
- Humanists of Colorado (Denver)
Connecticut
- Capitol Area Secular Humanists
- Humanist Association of Connecticut
- New England Skeptical Society
Delaware
- No known groups with websites.
Florida
- Atheist Community of Polk County
- Atheists of Florida
- BE Orlando
- Center for Inquiry Community of Daytona Beach
- Center for Inquiry Community of Fort Lauderdale
- Center for Inquiry Community of Miami
- Center for Inquiry Community of Naples
- Center for Inquiry Community of Tallahassee
- Center for Inquiry – Tampa
- First Coast Freethought Society
- Free Inquiry Society of Central Florida
- Humanist Association of West Central Florida
- Humanist Society of Gainesville
- Humanists of Florida Association
- Humanists of the Nature Coast (Lecanto)
- Humanists of Northeast Florida
- Humanists of Palm Beach County
- Humanists of the Sarasota Bay Area
- Humanists of the Suncoast
- Sense of Life Objectivists in Florida
- Space Coast Freethought Association
- Tallahassee Atheists
- Tampa Bay Skeptics
- Wonderful Atheists of Central Florida
Georgia
- Atlanta Freethought Society
- Fayette Freethought Society
- Fellowship of Reason
- Humanists of Georgia
- Savannah Community of Reason
Hawaii
- Hawaii Secular Society
- Humanists Hawaii
Idaho
- Humanists of Idaho
- Idaho Atheists
Illinois
- Center for Inquiry – Chicago
- Congregation Beth Or
- Ethical Humanist Society of Greater Chicago
- Humanists of North Eastern Illinois
- Humanists of West Suburban Chicagoland
Indiana
- Center for Inquiry – Indiana
- Church of Liberty
- Freethought Fort Wayne
- Indiana Skeptics
- Indy Atheists
Iowa
- Corridor A-Team
- Iowa Secularists
- Siouxland Atheists, Agnostics, and Freethinkers
Kansas
- Heartland Humanists
Kentucky
- Free Inquiry Group
- Kentucky Association of Science Educators and Skeptics
Maryland
- Baltimore Ethical Society
- Baltimore Secular Humanists
- Frederick Secular Humanists
- Maryland-DC Chapter of Washington Secular Humanists
Massachusetts
- Atheist Discussion Group
- Greater Worcester Humanists
- Humanist Association of Massachusetts
Michigan
- Center for Inquiry Michigan
- The Great Lakes Humanist Society
- Michigan Atheists
Minnesota
- Atheists For Human Rights
- Central Minnesota Friends Free of Theism
- Humanists of Minnesota
- Lake Superior Freethinkers
- Minnesota Atheists
Mississippi
- Great Southern Humanist Society
- Mississippi Atheists
Missouri
- Community of Reason
- Joplin Freethinkers
- Rationalist Society of St. Louis
- Skeptical Society of St. Louis
Montana
- Billings Association ofHumanists
- Missoula Area Secular Society
- Montana Freethinkers
Nebraska
- Nebraska Atheists
- Omaha Atheists
- Omaha Metro Area Humanist Association
- Rationalists, Empiricists and Skeptics of Nebraska
Nevada
- Humanist Association of Las Vegas and Southern Nevada
- Las Vegas Freethought Society
- Reno Freethinkers
New Jersey
- Humanists of North Jersey
- New Jersey Humanist Network
- Red Bank Humanists
New Mexico
- Atheist Skeptical Kingdom of Albuquerque
- Humanist Society of New Mexico
- New Mexicans for Science and Reason
New York
- Buffalo Atheists
- Capital District Humanist Society
- Center for Inquiry – Amherst
- Center for Inquiry Community of Harlem
- Center for Inquiry – Long Island
- Center for Inquiry New York City
- Central New York Skeptics
- Freethinkers of the Hudson Valley
- Freethinkers New York
- Freethinkers of Upstate New York
- Freethinking Activist Nonbelieving New Yorkers
- Hudson Valley Humanists
- Humanist Society of Metropolitan New York, Corliss Lamont Chapter
- Metro Atheists of New York
- New York City Atheists
- New York Society for Ethical Culture
- Secular Humanist Society of New York
North Carolina
- Central North Carolina Atheists and Humanists
- Humanists and Freethinkers of Cape Fear
- North Carolina Society for Ethical Culture
- Piedmont Freethought Association (Greensboro/Winston Salem)
- Triangle Freethought Society
- WNCAtheists (Western North Carolina)
North Dakota
Ohio
- Center for Inquiry of Northeast Ohio
- Cincinnati Skeptics
- Cleveland Freethinkers
- Free Inquiry Group (Cincinnati)
- Humanist Community of Central Ohio
- Northern Ohio Freethought Society
Oklahoma
- Humanist Association of Tulsa
- Oklahoma Atheists
Oregon
- Oregonians for Science and Reason
- Corvallis Secular Society
- Eugene Round Earth Society
- Humanist Association of Salem
- Humanists of Greater Portland
- Jefferson Center
- Lane County Secular Society
- United States Atheists (Portland)
Pennsylvania
- Atheism Skepticism Knowledge
- Atheist Station
- Freethought Society of Greater Philadelphia
- Humanist Association of Greater Philadelphia
- Humanist Community Services of Northeast Pennsylvania
- Lancaster Freethought Society
- Nittany Freethought
- Pennsylvania Nonbelievers
- Philadelphia Association for Critical Thinking
- Pittsburgh Freethought Community
- Secular Humanists & Atheists of the Lehigh Valley
Rhode Island
- No known groups with websites.
South Carolina
- Greenville Nontheists
- Secular Humanists of the Lowcountry
- Secular Humanists of the South Carolina Midlands
- South Carolina Secular Humanists
South Dakota
- No known groups with websites.
Tennessee
- Memphis Freethought Alliance
- Middle Tennessee Skeptics
- Rationalists of East Tennessee
Texas
- Atheist Community of Austin
- Center for Inquiry – Austin
- Dallas/Fort Worth Ethical Fellowship
- Ethical Society of Austin
- Freethinkers Association of Central Texas
- Freethinkers of East Texas
- Humanists of Montgomery County, Isaac Asimov Chapter
- Houston Atheist Society
- Houston Church of Freethought
- Humanists of Ft. Worth
- Humanists of Houston
- Metroplex Atheists
- North Texas Church of Freethought
- North Texas Skeptics
- Northeast Houston: Kingwood Humble Atascocita
- Texas Secular Society
Utah
- Atheists of Utah
- Freethought Society of Northern Utah
- Humanists of Utah
Vermont
- No known groups with websites.
Virginia
- Americans United for Separation of Church and State: Virginia Chapter
- Atheists of the New River Valley
- Central Virginia Secular Humanists
- Northern Virginia Secular Humanists
- Richmond Area Free Thinkers
- Science and Reason of Hampton Roads
- Shenandoah Area Secular Humanists
Washington (state)
- Ethical Culture Society of Puget Sound
- Humanists of North Puget Sound
- Humanists of Washington
- Inland Northwest Freethought Society
- Pacific Northwest Skeptics
- Seattle Atheists
- Secular Spokane
- Society for Sensible Explanations
- Spokane Humanists
- Tri-City Freethinkers
- Washington State Atheist, Agnostic, and Freethought Organizations
Washington, D.C.
- Center for Inquiry – Washington DC
- Maryland-DC Chapter of Washington Secular Humanists
- National Capital Area Skeptics
- Washington Area Secular Humanists
- Washington Ethical Society
West Virginia
- West Virginia Secular Congregation
- West Virginians for Science & Reason
Wisconsin
- Americans United for Separation of Church and State Wisconsin Chapter
- Atheists and Agnostics of Wisconsin
- Freethought Society of Wisconsin
- Humanist Quest of Milwaukee
- Lake Superior Freethinkers
- Life After Religion (Milwaukee)
- Southeastern Wisconsin FreeThinkers
Wyoming
- No known groups with websites.