Texas National Register of Historic Places listings in Connecticut, by county. Subcategories This category has the following 9 subcategories, out of 9 total. * Lists of National Register of Historic Places in Connecticut by county (8 P)F National Register of Historic Places in Fairfield County, Connecticut (285 P)H National Register of Historic Places in Hartford County, Connecticut (2 C, 294 P)L National Register of Historic Places in Litchfield County, Connecticut (172 P)M National Register of Historic Places in Middlesex County, Connecticut (125 P)N National Register of Historic Places in New Haven County, Connecticut (1 C, 203 P) National Register of Historic Places in New London County, Connecticut (198 P)T National Register of Historic Places in Tolland County, Connecticut (53 P)W National Register of Historic Places in Windham County, Connecticut (86 P)