Suffolk Co., New York, United States

A. P. W. Kennan House

Ambrose Parsons House

B. Ketchum House

Babylon Town Hall

Balcastle

Bald Hill Schoolhouse

Basilica of the Sacred Hearts of Jesus and Mary

Bay Crest Historic District

Bay Shore Hose Company No. 1 Firehouse

Bay Shore Methodist Episcopal Church

Bayles Shipyard

Beach Road Historic District

Beachbend

Beaux Arts Park Historic District

Bellport Academy

Bellport Village Historic District

Benjamin King Woodhull House

Bethel AME Church and Manse

Bethel–Christian Avenue–Laurel Hill Historical District

Big Duck Ranch

Blydenburgh Park Historic District

Bourne Windmill

Bowes House

Box Hill Estate

Brecknock Hall

Brewster House

Briar Patch Road Historic District

Broadwater Energy

Buell's Lane Historic District

By-the-Harbor

C. A. O'Donohue House

Caleb Bragg Estate

Camp Quinipet

Capt. C. Goodale House

Carll Burr Jr. House

Carll House

Carll S. Burr Mansion

Caroline Church and Cemetery

Carrington House

Cedar Island Light

Charles Geoghegan House

Charles Homer Davis House

Charles M. Weeks House

Charles Van Iderstine Mansion

Charles Woodhull House

Chichester's Inn

Cold Spring Harbor Fire District Hook and Ladder Company Building

Cold Spring Harbor Library

Coltrane House

Commack United Methodist Church and Cemetery

Congregation Tifereth Israel

Congregational Church of Patchogue

Crowther House

David Conklin House

David Tuthill Farmstead

Davis Town Meeting House

Delamater-Bevin Mansion

Dominican Village - Sisters of St. Dominic Motherhouse Complex

Dowden Tannery

Dr. Wesley Bowers House

East Deck Motel Family Resort

East Farm

East Hampton Village District

East Shore Road Historic District

Eatons Neck Light

Egypt Lane Historic District

Eliphas Buffett House

Ezra Carll Homestead

Fire Island Lighthouse

First Congregational Church of Bay Shore

First Congregational Church of New Village

First National Bank of Port Jefferson

First Presbyterian Church

First Presbyterian Church

Fort Corchaug Archeological Site

Fort Golgotha and the Old Burial Hill Cemetery

Fort H. G. Wright

Fort Hill Estate

Fort Terry

Foster-Meeker House

Francis S. Gabreski Air National Guard Base

Frank Melville Memorial Park

Gamecock Cottage

Gardiners Island Windmill

George McKesson Brown Estate -- Coindre Hall

Gilsey Mansion

Goose Hill Road Historic District

Great South Bay Bridges

Greenport Village Historic District

Grey Gardens

Halliock Inn

Hallock Homestead

Hallock-Bilunas Farmstead

Halsey Estate-Tallwood

Harbor House

Harbor Road Historic District

Harry E. Donnell House

Harry Wood House

Hawkins Homestead

Hayground Windmill