- Sciple's Water Mill
- Scituate Historical Society
- Searles Castle
- Sheffield Historical Society
- Shelburne Historical Society
- Shirley Historical Society
- Sibley House Historic Site
- Smithsburg Historical Society
- Socoro County Historical Scty
- Somerset Place
- Southport Historical Society
- Spring Valley Historical Soc
- Springfield Plantation
- Spruce Forest Artisan Village
- Squan Village Historical Scty
- St Thomas Preservation Hall
- State Capitol Tours-St Paul
- Steele County Historical Scty
- Stewartville Area Historical
- Stratham Historical Society
- Strawbridge Shrine Inc
- Stuhr Living History Museum
- Sword Of Peace
- Tales Of Cape Cod Inc
- Thomas R Zahn & Assoc
- Thurmont Historical Society
- Topsfield Historical Society
- Trading Path Preservation
- Trail Of Faith
- Transylvania Society Inc
- Travelers' Rest State Park
- Trenton Historical Society
- Tsongas Industrial History Ctr
- Uniontown Historic District
- University Archives
- USS Constellation
- USS Mass Memorial Committee
- Ventford Hall Assn Inc
- Vineland Historical Society
- Virginia Dare Community Ctr
- Waltham Historical Society
- Wanda Gag House Assoc
- Warner Historical Society
- Waters Farm Preservation Inc
- Watonwan County Historical Ctr
- Watson House
- Webster County Historical Soc
- Weeks Brick House
- Wentworth Gardner Tobias Lear
- West Concord Historical Scty
- Westboro Historical Society
- Westminster Historical Society
- Whalehead Club
- Whalehead Preservation Trust
- Whistle Stop Park Depot
- Whistle Stop Park Depot
- Whitman Stafford House
- Winnibigoshish Historical Ctr
- Wintergreen Cemetery
- Winterville Mounds State Park
- Winterville Museum
- Yellow Fever Church Museum
- Yellowstone Historic Ctr
