# National Register of Historic Places listings in Middlesex County, Connecticut

This is a list of the National Register of Historic Places listings in Middlesex County, Connecticut.
There are 127 properties and districts listed on the National Register of Historic Places in Middlesex County, Connecticut, United States. Tabulated here are 92 places; see National Register of Historic Places listings in Middletown, Connecticut for 35 more; the oyster sloop Christeen was located in Middlesex County when listed in 1991, but relocated to Oyster Bay, New York in 1992. Including those in Middletown, there are three National Historic Landmarks among the listings.
The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in an online map.
Contents: Counties and municipalities in Connecticut :
* Fairfield (city of Bridgeport) (town of Greenwich) (city of Stamford) |
* Hartford (city of Hartford) (town of Southington) (town of West Hartford) (town of Windsor) |
* Litchfield |
* Middlesex (city of Middletown) |
* New Haven (city of New Haven) |
* New London |
* Tolland |
* Windham
This National Park Service list is complete through NPS recent listings posted October 4, 2024.
Download coordinates as:
* KML
* GPX (all coordinates)
* GPX (primary coordinates)
* GPX (secondary coordinates)

## Current listings (excluding Middletown)

| | Name on the Register | Image | Date listed | Location | City or town | Description |
| 1 | Belltown Historic District | Belltown Historic District More images | October 28, 1985 (#85003543) | Roughly Main St. between W. High St. and CT 16, and portions of cross streets W. High, Barton Hill-Summit, and Skinner St. 41°34′23″N 72°30′17″W﻿ / ﻿41.573056°N 72.504722°W﻿ / 41.573056; -72.504722﻿ (Belltown Historic District) | East Hampton | |
| 2 | Black Horse Tavern | Black Horse Tavern | December 1, 1978 (#78002851) | Southeast of Old Saybrook at 175 N. Cove Rd. 41°17′20″N 72°21′20″W﻿ / ﻿41.288889°N 72.355556°W﻿ / 41.288889; -72.355556﻿ (Black Horse Tavern) | Old Saybrook | |
| 3 | BOC Site | Upload image | October 15, 1987 (#87001218) | Address Restricted | Haddam | Archaeological site documented as part of the Lower Connecticut River Valley Woodland Period Archaeological TR. 0.1 acre. |
| 4 | Bridge No. 1132 | Bridge No. 1132 | September 29, 2004 (#04001091) | CT 80 at the Hammonasset River 41°21′26″N 72°36′45″W﻿ / ﻿41.357222°N 72.612553°W﻿ / 41.357222; -72.612553﻿ (Bridge No. 1132) | Killingworth | Open-spandrel concrete arch bridge built in 1934; extends into Madison in New Haven County |
| 5 | Bridge No. 1603 | Bridge No. 1603 | July 29, 1993 (#93000641) | Devil's Hopyard Rd. (Rt. 434) over an unnamed brook in Devil's Hopyard State Park 41°29′02″N 72°20′33″W﻿ / ﻿41.483756°N 72.342370°W﻿ / 41.483756; -72.342370﻿ (Bridge No. 1603) | East Haddam | Near Chapman Falls. |
| 6 | Bridge No. 1604 | Bridge No. 1604 | July 29, 1993 (#93000642) | Devil's Hopyard Rd. (Rt. 434) over unnamed brook in Devil's Hopyard State Park 41°28′39″N 72°20′31″W﻿ / ﻿41.477417°N 72.341954°W﻿ / 41.477417; -72.341954﻿ (Bridge No. 1604) | East Haddam | |
| 7 | Bridge No. 1605 | Bridge No. 1605 | July 29, 1993 (#93000643) | Devil's Hopyard Rd. (Rt. 434) over Muddy Brook in Devil's Hopyard State Park 41°28′32″N 72°20′31″W﻿ / ﻿41.475528°N 72.341911°W﻿ / 41.475528; -72.341911﻿ (Bridge No. 1605) | East Haddam | |
| 8 | Benjamin Bushnell Farm | Benjamin Bushnell Farm | May 10, 1990 (#90000761) | 52 Ingham Hill Rd. 41°19′49″N 72°25′14″W﻿ / ﻿41.330278°N 72.420556°W﻿ / 41.330278; -72.420556﻿ (Benjamin Bushnell Farm) | Essex | |
| 9 | Elisha Bushnell House | Elisha Bushnell House | November 29, 1978 (#78002850) | 1445 Boston Post Rd. 41°17′14″N 72°24′31″W﻿ / ﻿41.287222°N 72.408611°W﻿ / 41.287222; -72.408611﻿ (Elisha Bushnell House) | Old Saybrook | |
| 10 | Bushnell-Dickinson House | Bushnell-Dickinson House | August 28, 2013 (#13000289) | 170 Old Post Rd. 41°17′12″N 72°24′11″W﻿ / ﻿41.286528°N 72.403087°W﻿ / 41.286528; -72.403087﻿ (Bushnell-Dickinson House) | Old Saybrook | |
| 11 | Camp Bethel | Camp Bethel More images | December 11, 2007 (#07001246) | 124 Camp Bethel Rd. 41°27′11″N 72°28′24″W﻿ / ﻿41.45309°N 72.473215°W﻿ / 41.45309; -72.473215﻿ (Camp Bethel) | Haddam | |
| 12 | Hubbell Carter House | Hubbell Carter House | November 29, 2018 (#100003147) | 2 Carter Hill Rd. 41°18′52″N 72°30′59″W﻿ / ﻿41.3144°N 72.516308°W﻿ / 41.3144; -72.516308﻿ (Hubbell Carter House) | Clinton | |
| 13 | Centerbrook Congregational Church | Centerbrook Congregational Church | February 12, 1987 (#87000113) | Main St. 41°21′06″N 72°24′53″W﻿ / ﻿41.351667°N 72.414722°W﻿ / 41.351667; -72.414722﻿ (Centerbrook Congregational Church) | Essex | |
| 14 | Clinton Village Historic District | Clinton Village Historic District | July 29, 1994 (#94000788) | Along Cemetery Rd., Church, E. Main and Liberty Sts., Old Post Rd., and Waterside Ln. 41°16′36″N 72°31′07″W﻿ / ﻿41.276667°N 72.518611°W﻿ / 41.276667; -72.518611﻿ (Clinton Village Historic District) | Clinton | |
| 15 | Commerce Street Historic District | Upload image | May 9, 2024 (#100009867) | 10-34, 38, 52, 58, odd #s 59-105, 109-125, 140-142 Commerce St, 7-9 Fisk Ave 41°16′23″N 72°31′40″W﻿ / ﻿41.2731°N 72.5278°W﻿ / 41.2731; -72.5278﻿ (Commerce Street Historic District) | Clinton | |
| 16 | Comstock's Bridge | Comstock's Bridge More images | January 1, 1976 (#76001978) | Southeast of East Hampton off CT 16 41°33′11″N 72°26′57″W﻿ / ﻿41.553056°N 72.449167°W﻿ / 41.553056; -72.449167﻿ (Comstock's Bridge) | East Hampton | |
| 17 | Comstock-Cheney Hall | Comstock-Cheney Hall | April 15, 1982 (#82003769) | Main and Summit Sts. 41°20′55″N 72°26′32″W﻿ / ﻿41.348642°N 72.442236°W﻿ / 41.348642; -72.442236﻿ (Comstock-Cheney Hall) | Essex | Better known as Ivoryton Theatre, the first summer theatre in the U.S.? |
| 18 | Connecticut Valley Railroad Roundhouse and Turntable Site | Connecticut Valley Railroad Roundhouse and Turntable Site More images | April 28, 1994 (#94000395) | Off Main St. in Fort Saybrook Monument Park in Saybrook Point 41°17′02″N 72°21′05″W﻿ / ﻿41.283889°N 72.351389°W﻿ / 41.283889; -72.351389﻿ (Connecticut Valley Railroad Roundhouse and Turntable Site) | Old Saybrook | |
| 19 | Cypress Cemetery | Cypress Cemetery | October 2, 2018 (#100003006) | 100 College St. 41°17′02″N 72°21′19″W﻿ / ﻿41.2838°N 72.3553°W﻿ / 41.2838; -72.3553﻿ (Cypress Cemetery) | Old Saybrook | |
| 20 | D & H Scovil Industrial Historic District | Upload image | July 11, 2024 (#100010491) | 11 Candlewood Hill Rd, 11 and 12 Scovil Rd, 529 Brainard Hill Rd 41°29′34″N 72°34′10″W﻿ / ﻿41.4927°N 72.5695°W﻿ / 41.4927; -72.5695﻿ (D & H Scovil Industrial Historic District) | Haddam | |
| 21 | Charles Daniels House | Charles Daniels House | February 19, 1988 (#88000094) | 43 Liberty St. 41°24′27″N 72°27′33″W﻿ / ﻿41.4075°N 72.459167°W﻿ / 41.4075; -72.459167﻿ (Charles Daniels House) | Chester | |
| 22 | Amasa Day House | Amasa Day House More images | September 22, 1972 (#72001315) | Plains Rd. 41°30′07″N 72°27′09″W﻿ / ﻿41.501944°N 72.4525°W﻿ / 41.501944; -72.4525﻿ (Amasa Day House) | East Haddam | |
| 23 | Deep River Freight Station | Deep River Freight Station More images | December 21, 1994 (#94001445) | 152 River St. 41°23′38″N 72°25′37″W﻿ / ﻿41.3939°N 72.4269°W﻿ / 41.3939; -72.4269﻿ (Deep River Freight Station) | Deep River | |
| 24 | Deep River Town Hall | Deep River Town Hall | January 1, 1976 (#76001977) | CT 80 and CT 9A 41°23′06″N 72°26′11″W﻿ / ﻿41.385°N 72.4364°W﻿ / 41.385; -72.4364﻿ (Deep River Town Hall) | Deep River | |
| 25 | Doane's Sawmill/Deep River Manufacturing Company | Doane's Sawmill/Deep River Manufacturing Company More images | February 21, 1985 (#85000313) | Horse Hill and Winthrop Rds. 41°20′17″N 72°29′02″W﻿ / ﻿41.3381°N 72.4839°W﻿ / 41.3381; -72.4839﻿ (Doane's Sawmill/Deep River Manufacturing Company) | Westbrook and Deep River | |
| 26 | Doris (Sailing yacht) | Doris (Sailing yacht) | May 31, 1984 (#84001108) | Connecticut River off River Rd. 41°23′00″N 72°23′34″W﻿ / ﻿41.3833°N 72.3928°W﻿ / 41.3833; -72.3928﻿ (Doris (Sailing yacht)) | Deep River | |
| 27 | Jedidiah Dudley House | Jedidiah Dudley House | April 12, 1982 (#82004339) | Springbrook Rd. 41°18′54″N 72°21′51″W﻿ / ﻿41.315°N 72.3642°W﻿ / 41.315; -72.3642﻿ (Jedidiah Dudley House) | Old Saybrook | |
| 28 | East Haddam Historic District | East Haddam Historic District | April 29, 1983 (#83001273) | CT 149, Broom, Norwich, Creamery, Lumberyard, and Landing Hill Rds. 41°27′23″N 72°27′45″W﻿ / ﻿41.4564°N 72.4625°W﻿ / 41.4564; -72.4625﻿ (East Haddam Historic District) | East Haddam | |
| 29 | Samuel Eliot House | Samuel Eliot House | November 9, 1972 (#72001316) | 500 Main St. 41°17′02″N 72°22′08″W﻿ / ﻿41.2839°N 72.3689°W﻿ / 41.2839; -72.3689﻿ (Samuel Eliot House) | Old Saybrook | |
| 30 | Emmanuel Church | Emmanuel Church More images | August 5, 1999 (#99000924) | 50 Emmanuel Church Rd. 41°23′34″N 72°36′33″W﻿ / ﻿41.3928°N 72.6092°W﻿ / 41.3928; -72.6092﻿ (Emmanuel Church) | Killingworth | |
| 31 | Essex Freight Station | Essex Freight Station More images | April 19, 1994 (#94000337) | 1 Railroad Ave. 41°21′00″N 72°24′18″W﻿ / ﻿41.3501°N 72.4049°W﻿ / 41.3501; -72.4049﻿ (Essex Freight Station) | Essex | |
| 32 | Fenwick Historic District | Fenwick Historic District More images | April 13, 1995 (#95000437) | Roughly, along Agawam, Neponset and Pettipaug Aves. 41°16′14″N 72°21′23″W﻿ / ﻿41.2706°N 72.35634°W﻿ / 41.2706; -72.35634﻿ (Fenwick Historic District) | Old Saybrook | |
| 33 | Goodspeed Opera House | Goodspeed Opera House | July 30, 1971 (#71000901) | Norwich Rd. 41°27′07″N 72°27′47″W﻿ / ﻿41.4519°N 72.4631°W﻿ / 41.4519; -72.4631﻿ (Goodspeed Opera House) | East Haddam | |
| 34 | Haddam Center Historic District | Haddam Center Historic District More images | February 9, 1989 (#89000012) | Roughly 2.5 miles (4.0 km) along Walkley Rd. and CT 154/Saybrook Rd. 41°28′46″N 72°30′55″W﻿ / ﻿41.4794°N 72.5153°W﻿ / 41.4794; -72.5153﻿ (Haddam Center Historic District) | Haddam | |
| 35 | Hadlyme North Historic District | Hadlyme North Historic District More images | December 8, 1988 (#88002686) | Roughly bounded by CT 82, Town St., Banning Rd., and Old Town St. 41°25′45″N 72°24′25″W﻿ / ﻿41.4292°N 72.4069°W﻿ / 41.4292; -72.4069﻿ (Hadlyme North Historic District) | East Haddam | |
| 36 | Hammonasset Paper Mill Site | Hammonasset Paper Mill Site More images | February 23, 1996 (#96000128) | Green Hill Road at the Hammonasset River 41°19′27″N 72°35′36″W﻿ / ﻿41.3241°N 72.5932°W﻿ / 41.3241; -72.5932﻿ (Hammonasset Paper Mill Site) | Killingworth | Extends into Madison. |
| 37 | Gen. William Hart House | Gen. William Hart House | November 9, 1972 (#72001318) | 350 Main St. 41°17′14″N 72°22′31″W﻿ / ﻿41.2871°N 72.3752°W﻿ / 41.2871; -72.3752﻿ (Gen. William Hart House) | Old Saybrook | |
| 38 | James Hazelton House | James Hazelton House | November 16, 1988 (#88001468) | 23 Hayden Hill Rd. 41°28′46″N 72°31′06″W﻿ / ﻿41.4794°N 72.5183°W﻿ / 41.4794; -72.5183﻿ (James Hazelton House) | Haddam | |
| 39 | Higganum Landing Historic District | Higganum Landing Historic District More images | December 10, 2018 (#100003206) | 40-68 Landing Rd., 2-14 Landing Rd. S 41°27′00″N 72°32′55″W﻿ / ﻿41.4500°N 72.5485°W﻿ / 41.4500; -72.5485﻿ (Higganum Landing Historic District) | Haddam | |
| 40 | High Street Historic District | Upload image | August 10, 2020 (#100005404) | 7 Central Ave., 19-114 High St., and 1-62 John St. 41°16′52″N 72°31′37″W﻿ / ﻿41.2810°N 72.5269°W﻿ / 41.2810; -72.5269﻿ (High Street Historic District) | Clinton | |
| 41 | Hill's Academy | Hill's Academy More images | August 23, 1985 (#85001831) | 22 Prospect St. 41°21′14″N 72°23′34″W﻿ / ﻿41.3539°N 72.3928°W﻿ / 41.3539; -72.3928﻿ (Hill's Academy) | Essex | |
| 42 | Indian Hill Avenue Historic District | Indian Hill Avenue Historic District More images | May 26, 1983 (#83001274) | Main St. and Indian Hill Ave. to the river 41°35′54″N 72°37′23″W﻿ / ﻿41.5983°N 72.6231°W﻿ / 41.5983; -72.6231﻿ (Indian Hill Avenue Historic District) | Portland | |
| 43 | Ivoryton Historic District | Ivoryton Historic District More images | April 15, 2014 (#13000895) | Roughly bounded by Main, N. Main, Oak, Blake & Summit Sts., Park Rd. & Comstock Ave. 41°20′54″N 72°26′27″W﻿ / ﻿41.348311°N 72.440813°W﻿ / 41.348311; -72.440813﻿ (Ivoryton Historic District) | Essex | Ivoryton, Connecticut |
| 44 | James Pharmacy | James Pharmacy | August 5, 1994 (#94000845) | 2 Pennywise Ln. 41°17′09″N 72°22′35″W﻿ / ﻿41.285833°N 72.376389°W﻿ / 41.285833; -72.376389﻿ (James Pharmacy) | Old Saybrook | Home and workplace of Anna Louise James (1886–1977), the first African-American woman pharmacist in the state. |
| 45 | Lay-Pritchett House | Lay-Pritchett House | October 11, 1978 (#78002854) | North of Westbrook on CT 145 41°19′55″N 72°29′35″W﻿ / ﻿41.331944°N 72.493056°W﻿ / 41.331944; -72.493056﻿ (Lay-Pritchett House) | Westbrook | |
| 46 | Daniel and Mary Lee House | Daniel and Mary Lee House | April 3, 1991 (#91000365) | Pepperidge Rd. E of Jobs Pond Rd. 41°34′47″N 72°34′59″W﻿ / ﻿41.579722°N 72.583056°W﻿ / 41.579722; -72.583056﻿ (Daniel and Mary Lee House) | Portland | |
| 47 | Little Haddam Historic District | Little Haddam Historic District | August 1, 1996 (#96000783) | Roughly bounded by E. Haddam Rd., Orchard Rd., and Town St. 41°28′44″N 72°26′48″W﻿ / ﻿41.478889°N 72.446667°W﻿ / 41.478889; -72.446667﻿ (Little Haddam Historic District) | East Haddam | |
| 48 | David Lyman II House | David Lyman II House | February 6, 1986 (#86000149) | 5 Lyman Rd. 41°29′47″N 72°42′43″W﻿ / ﻿41.496389°N 72.711944°W﻿ / 41.496389; -72.711944﻿ (David Lyman II House) | Middlefield | |
| 49 | Thomas Lyman House | Thomas Lyman House More images | November 20, 1975 (#75001921) | 105 Middlefield Rd. 41°29′18″N 72°41′16″W﻿ / ﻿41.4883°N 72.6877°W﻿ / 41.4883; -72.6877﻿ (Thomas Lyman House) | Durham | |
| 50 | Lynde Point Lighthouse | Lynde Point Lighthouse More images | May 29, 1990 (#89001469) | Southeastern terminus of Sequassen Ave. 41°16′16″N 72°20′38″W﻿ / ﻿41.271111°N 72.343889°W﻿ / 41.271111; -72.343889﻿ (Lynde Point Lighthouse) | Old Saybrook | |
| 51 | Main Street Historic District | Main Street Historic District | October 24, 1985 (#85003389) | Roughly bounded by Nooks Hill Rd., Prospect Hill Rd., Wall and West Sts. and New Ln., and Stevens Ln. and Main St. 41°36′07″N 72°38′56″W﻿ / ﻿41.601944°N 72.648889°W﻿ / 41.601944; -72.648889﻿ (Main Street Historic District) | Cromwell | |
| 52 | Main Street Historic District | Main Street Historic District More images | September 4, 1986 (#86002837) | Roughly Maple Ave. and Main St. between Talcott Ln. and Higganum Rd. 41°28′26″N 72°40′51″W﻿ / ﻿41.473889°N 72.680833°W﻿ / 41.473889; -72.680833﻿ (Main Street Historic District) | Durham | |
| 53 | Marlborough Street Historic District | Marlborough Street Historic District More images | March 20, 2012 (#12000130) | 58, 64, 69, 70, 78, 88, & 92 Marlborough St. 41°34′15″N 72°38′05″W﻿ / ﻿41.570814°N 72.634825°W﻿ / 41.570814; -72.634825﻿ (Marlborough Street Historic District) | Portland | |
| 54 | Middle Haddam Historic District | Middle Haddam Historic District More images | February 3, 1984 (#84001112) | Moodus and Long Hill Rds. 41°33′11″N 72°33′06″W﻿ / ﻿41.553056°N 72.551667°W﻿ / 41.553056; -72.551667﻿ (Middle Haddam Historic District) | East Hampton | |
| 55 | Middle Haddam School | Middle Haddam School | October 18, 2019 (#100004545) | 12 Schoolhouse Ln. 41°33′09″N 72°32′52″W﻿ / ﻿41.5525°N 72.5478°W﻿ / 41.5525; -72.5478﻿ (Middle Haddam School) | East Hampton | |
| 56 | Middletown Upper Houses Historic District | Middletown Upper Houses Historic District More images | July 27, 1979 (#79002620) | CT 99 41°35′19″N 72°38′28″W﻿ / ﻿41.588611°N 72.641111°W﻿ / 41.588611; -72.641111﻿ (Middletown Upper Houses Historic District) | Cromwell | Historic district of area that was in Middletown, until it was split to Cromwell in 1851 |
| 57 | Millington Green Historic District | Millington Green Historic District | July 25, 1996 (#96000782) | Roughly bounded by Millington, Tater Hill, Haywardville, and Old Hopyard Rds. 41°29′06″N 72°21′28″W﻿ / ﻿41.485°N 72.357778°W﻿ / 41.485; -72.357778﻿ (Millington Green Historic District) | East Haddam | |
| 58 | North Cove Historic District | North Cove Historic District More images | July 22, 1994 (#94000766) | Roughly N. Cove Rd. from Church St. to the Connecticut River and adjacent properties on Cromwell Pl. 41°17′13″N 72°21′32″W﻿ / ﻿41.286944°N 72.358889°W﻿ / 41.286944; -72.358889﻿ (North Cove Historic District) | Old Saybrook | |
| 59 | Oak Lodge | Oak Lodge | September 4, 1986 (#86001734) | Western side of Schreeder Pond, Chatfield Hollow State Park 41°22′11″N 72°35′27″W﻿ / ﻿41.369722°N 72.590833°W﻿ / 41.369722; -72.590833﻿ (Oak Lodge) | Killingworth | |
| 60 | Old Saybrook South Green | Old Saybrook South Green More images | September 3, 1976 (#76001984) | Old Boston Post Rd., Pennywise Lane, Main St. 41°17′17″N 72°22′36″W﻿ / ﻿41.287933°N 72.376771°W﻿ / 41.287933; -72.376771﻿ (Old Saybrook South Green) | Old Saybrook | |
| 61 | Old Saybrook Town Hall and Theater | Old Saybrook Town Hall and Theater | June 21, 2007 (#07000558) | 300 Main St. 41°17′26″N 72°23′11″W﻿ / ﻿41.290556°N 72.386389°W﻿ / 41.290556; -72.386389﻿ (Old Saybrook Town Hall and Theater) | Old Saybrook | Now known as the Katharine Hepburn Cultural Arts Center |
| 62 | Old Town Hall | Old Town Hall | February 23, 1972 (#72001310) | On the green between Liberty St. and Goose Hill Rd. 41°24′25″N 72°27′09″W﻿ / ﻿41.406944°N 72.4525°W﻿ / 41.406944; -72.4525﻿ (Old Town Hall) | Chester | |
| 63 | Oriole Rockshelter | Upload image | October 15, 1987 (#87001222) | Address Restricted | East Haddam | |
| 64 | Parker House | Parker House | November 29, 1978 (#78002853) | 680 Middlesex Turnpike 41°19′25″N 72°22′30″W﻿ / ﻿41.323611°N 72.375°W﻿ / 41.323611; -72.375﻿ (Parker House) | Old Saybrook | |
| 65 | Parmelee House | Parmelee House | May 15, 2007 (#07000417) | 4 Beckwith Rd. 41°23′03″N 72°35′13″W﻿ / ﻿41.384167°N 72.586944°W﻿ / 41.384167; -72.586944﻿ (Parmelee House) | Killingworth | |
| 66 | Portland Brownstone Quarries | Portland Brownstone Quarries | May 16, 2000 (#00000703) | Brownstone Ave. and Silver St. 41°34′30″N 72°38′36″W﻿ / ﻿41.575°N 72.643333°W﻿ / 41.575; -72.643333﻿ (Portland Brownstone Quarries) | Portland | Quarried since 1690, source of vast quantities of brownstone for New York City, Philadelphia, Boston, other urban areas' buildings. |
| 67 | Pratt House | Pratt House More images | August 23, 1985 (#85001824) | 19 West Ave. 41°21′13″N 72°23′40″W﻿ / ﻿41.3536°N 72.3945°W﻿ / 41.3536; -72.3945﻿ (Pratt House) | Essex | |
| 68 | Dr. Ambrose Pratt House | Dr. Ambrose Pratt House | November 9, 1972 (#72001311) | Pratt St. 41°24′01″N 72°26′43″W﻿ / ﻿41.400278°N 72.445278°W﻿ / 41.400278; -72.445278﻿ (Dr. Ambrose Pratt House) | Chester | |
| 69 | Caleb Pratt House | Upload image | March 28, 2024 (#100010112) | 26 Gates Road 41°20′27″N 72°23′29″W﻿ / ﻿41.3409°N 72.3913°W﻿ / 41.3409; -72.3913﻿ (Caleb Pratt House) | Essex | |
| 70 | Humphrey Pratt Tavern | Humphrey Pratt Tavern | November 7, 1972 (#72001320) | 287 Main St. 41°17′18″N 72°22′35″W﻿ / ﻿41.288333°N 72.376389°W﻿ / 41.288333; -72.376389﻿ (Humphrey Pratt Tavern) | Old Saybrook | |
| 71 | Pratt, Read and Company Factory Complex | Pratt, Read and Company Factory Complex | August 30, 1984 (#84001117) | Main St. between Bridge and Spring Sts. and 5 Bridge St. 41°23′25″N 72°26′22″W﻿ / ﻿41.390278°N 72.439444°W﻿ / 41.390278; -72.439444﻿ (Pratt, Read and Company Factory Complex) | Deep River | |
| 72 | Rapallo Viaduct | Rapallo Viaduct More images | August 21, 1986 (#86002728) | Flat Brook and former Air Line railroad right-of-way 41°34′19″N 72°28′19″W﻿ / ﻿41.571944°N 72.471944°W﻿ / 41.571944; -72.471944﻿ (Rapallo Viaduct) | East Hampton | |
| 73 | Roaring Brook I Site | Upload image | July 31, 1987 (#87001220) | Address Restricted | East Haddam | Archaeological site documented as part of the Lower Connecticut River Valley Woodland Period Archaeological TR. Less than 1 acre. |
| 74 | Roaring Brook II Site | Upload image | July 31, 1987 (#87001221) | Address Restricted | East Haddam | Archaeological site documented as part of the Lower Connecticut River Valley Woodland Period Archaeological TR. Less than 1 acre. |
| 75 | Sage-Kirby House | Sage-Kirby House | April 29, 1982 (#82003767) | 93 Shunpike Rd. 41°36′41″N 72°40′36″W﻿ / ﻿41.611389°N 72.676667°W﻿ / 41.611389; -72.676667﻿ (Sage-Kirby House) | Cromwell | |
| 76 | Saybrook Breakwater Lighthouse | Saybrook Breakwater Lighthouse More images | May 29, 1990 (#89001474) | Southern terminus of Saybrook Jetty at the mouth of the Connecticut River 41°15′47″N 72°20′35″W﻿ / ﻿41.263056°N 72.343056°W﻿ / 41.263056; -72.343056﻿ (Saybrook Breakwater Lighthouse) | Old Saybrook | |
| 77 | Seventh Sister | Seventh Sister More images | July 31, 1986 (#86002103) | 67 River Rd. 41°25′25″N 72°25′53″W﻿ / ﻿41.423611°N 72.431389°W﻿ / 41.423611; -72.431389﻿ (Seventh Sister) | East Haddam and Lyme | Now Gillette Castle State Park. |
| 78 | Shore Line Electric Railway Power House | Shore Line Electric Railway Power House | June 20, 2019 (#100004086) | 220 Ferry Road 41°18′51″N 72°21′39″W﻿ / ﻿41.3141°N 72.3609°W﻿ / 41.3141; -72.3609﻿ (Shore Line Electric Railway Power House) | Old Saybrook | |
| 79 | Steamboat Dock Site | Steamboat Dock Site More images | April 1, 1982 (#82003768) | Main St. 41°21′04″N 72°23′06″W﻿ / ﻿41.351111°N 72.385°W﻿ / 41.351111; -72.385﻿ (Steamboat Dock Site) | Essex | Now the Connecticut River Museum |
| 80 | William Stevens House | William Stevens House | May 30, 1985 (#85001163) | 131 Cow Hill Rd. 41°18′17″N 72°32′45″W﻿ / ﻿41.3047°N 72.5457°W﻿ / 41.3047; -72.5457﻿ (William Stevens House) | Clinton | |
| 81 | William Tully House | William Tully House | March 15, 1982 (#82004340) | 135 N. Cove Rd. 41°17′21″N 72°21′26″W﻿ / ﻿41.289167°N 72.357222°W﻿ / 41.289167; -72.357222﻿ (William Tully House) | Old Saybrook | |
| 82 | Villa Bella Vista | Villa Bella Vista | December 28, 2000 (#00001560) | 7 Old Depot Rd. 41°24′12″N 72°26′28″W﻿ / ﻿41.403333°N 72.441111°W﻿ / 41.403333; -72.441111﻿ (Villa Bella Vista) | Chester | |
| 83 | William Ward Jr. House | William Ward Jr. House | February 19, 1988 (#88000109) | 137 Powder Hill Rd. 41°30′14″N 72°43′47″W﻿ / ﻿41.5040°N 72.7298°W﻿ / 41.5040; -72.7298﻿ (William Ward Jr. House) | Middlefield | |
| 84 | Warner House | Warner House | February 19, 1987 (#87000174) | 307 Town St. 41°27′12″N 72°26′27″W﻿ / ﻿41.453333°N 72.440833°W﻿ / 41.453333; -72.440833﻿ (Warner House) | East Haddam | |
| 85 | Jonathan Warner House | Jonathan Warner House | December 19, 1978 (#78002855) | 47 Kings Highway 41°25′00″N 72°26′27″W﻿ / ﻿41.416667°N 72.440833°W﻿ / 41.416667; -72.440833﻿ (Jonathan Warner House) | Chester | |
| 86 | Westbrook Town Center Historic District | Westbrook Town Center Historic District More images | October 16, 2017 (#100001732) | Old Clinton at Hammock Rds., Boston Post Rd. at Bellstone Ave., Trolley Rd., Boston Post Rd. at Goodspeed Dr. 41°17′04″N 72°26′44″W﻿ / ﻿41.284394°N 72.445492°W﻿ / 41.284394; -72.445492﻿ (Westbrook Town Center Historic District) | Westbrook | |
| 87 | White-Overton-Callander House | White-Overton-Callander House | May 21, 2014 (#13000896) | 492 Main Street 41°35′15″N 72°37′43″W﻿ / ﻿41.5876°N 72.6285°W﻿ / 41.5876; -72.6285﻿ (White-Overton-Callander House) | Portland | House museum of the Portland Historical Society |
| 88 | Ambrose Whittlesey House | Ambrose Whittlesey House | August 23, 1985 (#85001830) | 14 Main St. 41°17′51″N 72°22′37″W﻿ / ﻿41.2975°N 72.376944°W﻿ / 41.2975; -72.376944﻿ (Ambrose Whittlesey House) | Old Saybrook | |
| 89 | John Whittlesey Jr. House | John Whittlesey Jr. House | October 26, 1984 (#84002644) | 40 Ferry Rd. 41°18′49″N 72°21′33″W﻿ / ﻿41.31366°N 72.35923°W﻿ / 41.31366; -72.35923﻿ (John Whittlesey Jr. House) | Old Saybrook | |
| 90 | Wickham Road Historic District | Wickham Road Historic District | July 25, 1996 (#96000781) | Roughly the junction of Wickham and Geoffrey Rds. 41°30′16″N 72°22′46″W﻿ / ﻿41.504444°N 72.379444°W﻿ / 41.504444; -72.379444﻿ (Wickham Road Historic District) | East Haddam | |
| 91 | Williams and Stancliff Octagon Houses | Williams and Stancliff Octagon Houses | April 22, 1976 (#76001985) | 26 and 28 Marlborough St. 41°34′21″N 72°38′20″W﻿ / ﻿41.5725°N 72.638889°W﻿ / 41.5725; -72.638889﻿ (Williams and Stancliff Octagon Houses) | Portland | |
| 92 | Working Girls' Vacation Society Historic District | Working Girls' Vacation Society Historic District | June 3, 1994 (#94000557) | 60, 64, and 66 Mill Rd. 41°26′31″N 72°23′43″W﻿ / ﻿41.441944°N 72.395278°W﻿ / 41.441944; -72.395278﻿ (Working Girls' Vacation Society Historic District) | East Haddam | |

## Formerly listed, and other status

| | Name on the Register | Image | Date listed | Location | City or town | Description |
| 1 | Christeen (oyster sloop) | Christeen (oyster sloop) More images | December 4, 1991 (#91002060) | Essex Harbor 41°21′03″N 72°23′04″W﻿ / ﻿41.350833°N 72.384444°W﻿ / 41.350833; -72.384444﻿ (Christeen (oyster sloop)) | Essex | Sloop that was stationed in Essex Harbor when NRHP-listed, later moved to Oyster Bay, New York. |