| Name | Styles | Significance | Periods |
|---|
East Haddam Historic District (CT 149, Broom, Norwich, Creamery, Lumberyard, and Landing Hill Rds.) | Federal, Greek Revival | politics, government, architecture, entertainment, recreation, commerce, industry | 1750-1799, 1800-1824, 1875-1899, 1825-1849, 1700-1749, 1850-1874 |
Goodspeed Opera House (Norwich Rd.) | | performing arts, architecture | 1875-1899 |
Hadlyme North Historic District (Roughly bounded by CT 82, Town St., Banning Rd., and Old Town St.) | Colonial, Mid 19th Century Revival | architecture | 1850-1874, 1900-1924, 1825-1849, 1925-1949, 1875-1899, 1750-1799, 1800-1824 |
Little Haddam Historic District (Roughly bounded by E. Haddam Rd., Orchard Rd., and Town St.) | Federal, Colonial, Greek Revival | art, politics, government, social history, architecture | 1900-1924, 1850-1874, 1700-1749, 1875-1899, 1800-1824, 1825-1849, 1750-1799 |
Millington Green Historic District (Roughly bounded by Millington, Tater Hill, Haywardville, and Old Hopyard Rds.) | Colonial, Greek Revival | commerce, architecture | 1825-1849, 1850-1874, 1750-1799, 1700-1749, 1800-1824 |
Seventh Sister (67 River Rd.) | Bungalow, Craftsman | architecture, performing arts | 1900-1924 |
Wickham Road Historic District (Roughly, jct. of Wickham and Geoffrey Rds.) | Colonial | architecture, agriculture, industry | 1750-1799, 1700-1749, 1800-1824 |
Working Girls' Vacation Society Historic District (60, 64 and 66 Mill Rd.) | Mid 19th Century Revival, Bungalow, Craftsman | social history | 1900-1924, 1925-1949, 1875-1899 |