Local Chapters of ATOS are the organizations that really do all the work of preserving and presenting Theatre Organ to the public. Please lookup the Chapters in your area and get involved!
| Chapter | State/Prov. | City |
|---|---|---|
| Alabama | Alabama | Birmingham |
| ATLANTA | Georgia | Atlanta |
| Australia Felix | Australia-Wide | |
| BINGHAMTON THEATER ORGAN SOCIETY, INC. | New York | Binghamton |
| BLUEGRASS | Kentucky | Lexington |
| CEDAR RAPIDS | Iowa | |
| CENTRAL FLORIDA | Florida | |
| CENTRAL ILLINOIS | Illinois | Springfield |
| CENTRAL INDIANA | Indiana | Indianapolis |
| CENTRAL MINNESOTA OTTER TAIL | Minnesota | |
| CHICAGO AREA | Illinois | Chicago |
| CHICAGOLAND | Illinois | Chicago |
| Cinema Organ Society (affiliate) | United Kingdom | |
| COLUMBIA RIVER | Washington | Vancouver |
| CONNECTICUT VALLEY | Connecticut | |
| CUMBERLAND VALLEY | Pennsylvania | |
| DAIRYLAND | Wisconsin | Milwaukee |
| DELAWARE VALLEY | Pennsylvania | |
| Detroit Theatre Organ Society (affiliate) | Michigan | Detroit |
| Dickinson Theatre Organ Society | Delaware | Wilmington |
| EASTERN MASSACHUSETTS | Massachusetts | |
| FIRST COAST | Florida | Jacksonville |
| FREE STATE | Maryland | |
| GARDEN STATE | New Jersey | |
| GREAT LAKES BAY | Michigan | Saginaw |
| GREAT SALT LAKE | Utah | Salt Lake City |
| HILO | Hawaii | |
| Houston Theatre Organ Society | Texas | Houston |
| HUDSON MOHAWK | New York | Schenectady |
| Island Empire | California | San Bernadino |
| JESSE CRAWFORD | Montana | Billings |
| JOLIET | Illinois | Joliet |
| KANSAS CITY | Missouri | Kansas City |
| KINGSTON | Canada | Odessa |
| LA CROSSE SCENIC BLUFFS | Wisconsin | |
| LAND O' LAKES | Minnesota | Minneapolis / St. Paul |
| Lansing Theatre Organ, Inc. (affiliate) | Michigan | Lansing |
| LONDON and SOUTH of LONDON | England, General | London |
| Los Angeles | California | Los Angeles |
| MAGNOLIA | Mississippi | |
| MANASOTA | Florida | Sarasota |
| METROLINA | North Carolina | Charlotte |
| MOTOR CITY | Michigan | Detroit |
| Mount Shasta | California | |
| NEVADA DESERT LIGHTS | Nevada | Las Vegas |
| NEW YORK | New York | New York City |
| Nor-Cal | California | San Francisco |
| NORTH TEXAS | Texas | Dallas / Ft. Worth |
| NORTHERN MICHIGAN | Michigan | Traverse City |
| OHIO VALLEY | Ohio | Cincinnati |
| OLD DOMINION | Virginia | Richmond |
| Orange County | California | |
| OREGON | Oregon | Portland |
| PACKERLAND | Wisconsin | |
| PIEDMONT | North Carolina | Burlington |
| PIKES PEAK | Colorado | Colorado Springs |
| PINE TREE | Maine | |
| Pittsburgh Area Theatre Organ Society | Pennsylvania | Pittsburgh |
| PUGET SOUND | Washington | Seattle |
| Red River Theatre Organ Society | North Dakota | Fargo |
| RIVER CITY | Nebraska | Omaha |
| Rochester Theatre Organ Society (affiliate) | New York | Rochester |
| ROCKY MOUNTAIN | Colorado | Denver |
| ROME NEW YORK | New York | Central New York |
| Saint Louis | Missouri | St. Loius |
| San Diego | California | San Diego |
| SANTA BARBARA | California | Santa Barbara |
| SEQUOIA | California | Fresno |
| SIERRA | California | Sacramento |
| SOONER STATE | Oklahoma | Tulsa |
| SOUTH FLORIDA | Florida | |
| SOUTHEAST TEXAS | Texas | Orange |
| SOUTHERN JERSEY | New Jersey | |
| SPOKANE FIRST NAZARENE | Washington | Spokane |
| SUSQUEHANNA VALLEY | Pennsylvania | York |
| Valley of the Sun | Arizona | Phoenix |
| WESTERN RESERVE | Ohio | Cleveland |