| Ansonia | Map | |
| Ansonia Historic District | Map | Ansonia Historic District |
| Berlin | Map | |
| Berlin Historic District | Map | Berlin Historic District |
| Bethlehem | Map | |
| Bethlehem Green Historic District | Map | Bethlehem Green Historic District |
| Bridgeport | Map | |
| Barnum-Palliser Historic District | Map | Barnum-Palliser Historic District |
| Black Rock Harbor Historic District | Map | Black Rock Harbor Historic District |
| Marina Park Historic District | Map | Marina Park Historic District |
| Pembroke City Historic District | Map | Pembroke City Historic District |
| Stratfield Historic District | Map | Stratfield Historic District |
| Bristol | Map | |
| Overlook Historic District | Map | Overlook Historic District |
| Brookfield | Map | |
| Brookfield Center Historic District No. 1 | Map | Brookfield Center Historic District No. 1 |
| Canton | Map | |
| Canton Center Historic District | Map | Canton Center Historic District |
| Collinsville Historic District | Map | Collinsville Historic District |
| Chaplin | Map | |
| Chaplin Historic District | Map | Chaplin Historic District |
| Cheshire | Map | |
| Cornwall Avenue Town Center Historic District | Map | Cornwall Avenue Town Center Historic District |
| South Brooksvale Historic District | Map | South Brooksvale Historic District |
| Clinton | Map | |
| Liberty Green Historic District | Map | Liberty Green Historic District |
| Colchester | Map | |
| Colchester Historic District | Map | Colchester Historic District |
| Colebrook | Map | |
| Colebrook Center Historic District | Map | Colebrook Center Historic District |
| Colebrook North Historic District | Map | Colebrook North Historic District |
| Danbury | Map | |
| Danbury Music Center | Map | Danbury Music Center |
| Durham | Map | |
| Durham Historic District | Map | Durham Historic District |
| Thomas Lyman House | Map | Thomas Lyman House |
| East Haddam | Map | |
| East Haddam Historic District | Map | East Haddam Historic District |
| Little Haddam Historic District | Map | Little Haddam Historic District |
| Millington Green Historic District | Map | Millington Green Historic District |
| Wickham Sawmill Historic District | Map | Wickham Sawmill Historic District |
| East Hampton | Map | |
| Middle Haddam Historic District | Map | Middle Haddam Historic District |
| East Hartford | Map | |
| Naubuc Avenue Historic District | Map | Naubuc Avenue Historic District |
| East Lyme | Map | |
| Little Boston School | Map | Little Boston School |
| Thomas Lee House | Map | Thomas Lee House |
| Enfield | Map | |
| Enfield Historic District | Map | Enfield Historic District |
| Fairfield | Map | |
| 5210 Congress St | Map | 5210 Congress St |
| Birdcraft Sanctuary | Map | Birdcraft Sanctuary |
| Burr Sherwood Cottage | Map | Burr Sherwood Cottage |
| David Ogden House | Map | David Ogden House |
| Greenfield Hill Historic District | Map | Greenfield Hill Historic District |
| Ira DeVer Warner Villa | Map | Ira DeVer Warner Villa |
| Jonathan Sturges House | Map | Jonathan Sturges House |
| Northrup Cottage | Map | Northrup Cottage |
| Old Post Road Historic District | Map | Old Post Road Historic District |
| Powder House | Map | Powder House |
| Silliman House | Map | Silliman House |
| Southport Historic District | Map | Southport Historic District |
| Victor Civkin Studio | Map | Victor Civkin Studio |
| Trinity St. Michael's Episcopal Church | Map | Trinity St. Michael's Episcopal Church |
| Farmington | Map | |
| 11 Progress Ave | Map | 11 Progress Ave |
| 62 Sylvan Avenue | Map | 62 Sylvan Avenue |
| Austin Barney House | Map | Austin Barney House |
| Avenue Historic District | Map | Avenue Historic District |
| Clover Pinney Park Historic District | Map | Clover Pinney Park Historic District |
| Episcopal Parsonage | Map | Episcopal Parsonage |
| Farmington Main Street Historic District | Map | Farmington Main Street Historic District |
| Frank Sanford House | Map | Frank Sanford House |
| Gustave Wollenberg House | Map | Gustave Wollenberg House |
| Hallstead and Carlson Studio House | Map | Hallstead and Carlson Studio House |
| Harry S. Robertson House | Map | Harry S. Robertson House |
| Howard W. Humphrey House | Map | Howard W. Humphrey House |
| John D. Horsfall House | Map | John D. Horsfall House |
| Judge Philips House | Map | Judge Philips House |
| Lovely-Main Street Historic District | Map | Lovely-Main Street Historic District |
| Main Street West Historic District | Map | Main Street West Historic District |
| Merriman Street Historic District | Map | Merriman Street Historic District |
| Nathaniel Hayden Apartments | Map | Nathaniel Hayden Apartments |
| School Street Historic District | Map | School Street Historic District |
| Unionville Historic District | Map | Unionville Historic District |
| Mason-Ingram Cottage | Map | Mason-Ingram Cottage |
| The Still House | Map | The Still House |
| Glastonbury | Map | |
| Glastonbury Historic District | Map | Glastonbury Historic District |
| Greenwich | Map | |
| John Street- Round Hill Historic District | Map | John Street- Round Hill Historic District |
| Stanwich Historic District | Map | Stanwich Historic District |
| Strickland Road Historic District | Map | Strickland Road Historic District |
| Stoneybrooke | Map | Stoneybrooke |
| Gershom Lockwood III House | Map | Gershom Lockwood III House |
| Charles Green House | Map | Charles Green House |
| French Farm | Map | French Farm |
| Samuel Ferris House | Map | Samuel Ferris House |
| Groton | Map | |
| Burnett's Corner Historic District | Map | Burnett's Corner Historic District |
| Center Groton Historic District | Map | Center Groton Historic District |
| Eastern Point Historic District | Map | Eastern Point Historic District |
| Mystic Historic District | Map | Mystic Historic District |
| Guilford | Map | |
| Guilford Town Center Historic District | Map | Guilford Town Center Historic District |
| Whitfield Street Historic District | Map | Whitfield Street Historic District |
| Hamden | Map | |
| Hamden Memorial Town Hall | Map | Hamden Memorial Town Hall |
| Hartford | Map | |
| George Keller Historic District | Map | George Keller Historic District |
| Grandview Terrace Boulevard Historic District | Map | Grandview Terrace Boulevard Historic District |
| Ridgefield Street Historic District | Map | Ridgefield Street Historic District |
| The Old State House | Map | The Old State House |
| 410 Asylum Street | Map | 410 Asylum Street |
| Harwinton | Map | |
| Harwinton Historic District - A | Map | Harwinton Historic District - A |
| Harwinton Historic District - B | Map | Harwinton Historic District - B |
| Samuel Peck House | Map | Samuel Peck House |
| Hebron | Map | |
| 192 Hope Valley Rd | Map | 192 Hope Valley Rd |
| 233 Millstream Road | Map | 233 Millstream Road |
| Burrows Hill School | Map | Burrows Hill School |
| Horton House | Map | Horton House |
| Old Town Hall | Map | Old Town Hall |
| Old Town Hall Historic District | Map | Old Town Hall Historic District |
| Peters House | Map | Peters House |
| Town Records Building | Map | Town Records Building |
| Kent | Map | |
| Flanders Historic District | Map | Flanders Historic District |
| Killingly | Map | |
| Danielson Historic District - Academy Street | Map | Danielson Historic District - Academy Street |
| Dayville Historic District | Map | Dayville Historic District |
| South Killingly Historic District | Map | South Killingly Historic District |
| Stone Road Historic Trail | Map | Stone Road Historic Trail |
| Samuel Moffitt House | Map | Samuel Moffitt House |
| Killingly Grange No. 112 | Map | Killingly Grange No. 112 |
| Ledyard | Map | |
| Sawmill Historic District | Map | Sawmill Historic District |
| Nathan Lester House & Farm Tool Museum | Map | Nathan Lester House & Farm Tool Museum |
| Litchfield | Map | |
| Borough Of Litchfield Historic District | Map | Borough Of Litchfield Historic District |
| Milton Historic District | Map | Milton Historic District |
| Lyme | Map | |
| Hadlyme Ferry Historic District | Map | Hadlyme Ferry Historic District |
| Madison | Map | |
| Madison Historic District | Map | Madison Historic District |
| Manchester | Map | |
| Cheney Brothers Historic District | Map | Cheney Brothers Historic District |
| Mansfield | Map | |
| Mansfield Center Historic District | Map | Mansfield Center Historic District |
| Mansfield Hollow Historic District | Map | Mansfield Hollow Historic District |
| Spring Hill Historic District | Map | Spring Hill Historic District |
| Milford | Map | |
| Milford Historic District | Map | Milford Historic District |
| South of the Green Historic District | Map | South of the Green Historic District |
| Monroe | Map | |
| Monroe Center Historic District | Map | Monroe Center Historic District |
| Stepney Historic District | Map | Stepney Historic District |
| New Canaan | Map | |
| New Canaan Historic District | Map | New Canaan Historic District |
| New Fairfield | Map | |
| Austin House | Map | Austin House |
| New Hartford | Map | |
| Pine Meadow Historic District | Map | Pine Meadow Historic District |
| New Haven | Map | |
| City Point Historic District | Map | City Point Historic District |
| Quinnipiac River Historic District | Map | Quinnipiac River Historic District |
| Wooster Square Historic District | Map | Wooster Square Historic District |
| New London | Map | |
| Starr Street Historic District | Map | Starr Street Historic District |
| New Milford | Map | |
| Roger Sherman Town Hall | Map | Roger Sherman Town Hall |
| Newtown | Map | |
| Borough of Newtown Historic District | Map | Borough of Newtown Historic District |
| Hattertown Historic District | Map | Hattertown Historic District |
| Norfolk | Map | |
| Norfolk Historic District | Map | Norfolk Historic District |
| Norwalk | Map | |
| Norwalk Green Historic District | Map | Norwalk Green Historic District |
| Norwich | Map | |
| Little Plain Historic District | Map | Little Plain Historic District |
| Norwichtown Historic District | Map | Norwichtown Historic District |
| Old Lyme | Map | |
| Old Lyme Historic District | Map | Old Lyme Historic District |
| Old Saybrook | Map | |
| Borough of Fenwick Historic District | Map | Borough of Fenwick Historic District |
| North Cove Road Historic District | Map | North Cove Road Historic District |
| Orange | Map | |
| Orange Center Historic District | Map | Orange Center Historic District |
| Plymouth | Map | |
| Terry Waterwheel | Map | Terry Waterwheel |
| Prospect | Map | |
| David Hotchkiss House | Map | David Hotchkiss House |
| Ridgefield | Map | |
| Ridgefield Historic District | Map | Ridgefield Historic District |
| Benedict House and Shop | Map | Benedict House and Shop |
| Roxbury | Map | |
| Roxbury Historic District | Map | Roxbury Historic District |
| Salisbury | Map | |
| Historic District Number 16 | Map | Historic District Number 16 |
| Lakeville Historic District | Map | Lakeville Historic District |
| Landowska Center | Map | Landowska Center |
| Lime Rock Historic District | Map | Lime Rock Historic District |
| Salisbury Center Historic District | Map | Salisbury Center Historic District |
| Undermountain Inn | Map | Undermountain Inn |
| Sharon | Map | |
| Sharon Historic District | Map | Sharon Historic District |
| Sherman | Map | |
| Sherman Historic District | Map | Sherman Historic District |
| Simsbury | Map | |
| East Weatogue Historic District | Map | East Weatogue Historic District |
| South Windsor | Map | |
| South Windsor Historic District | Map | South Windsor Historic District |
| Southbury | Map | |
| South Britain Historic District | Map | South Britain Historic District |
| Southbury Historic District No. 1 | Map | Southbury Historic District No. 1 |
| Stamford | Map | |
| Old Long Ridge Village Historic District | Map | Old Long Ridge Village Historic District |
| Orient Lodge | Map | Orient Lodge |
| Sterling | Map | |
| Sterling Hill Historic District | Map | Sterling Hill Historic District |
| Stratford | Map | |
| Academy Hill Historic District | Map | Academy Hill Historic District |
| Suffield | Map | |
| Hastings Hill Historic District | Map | Hastings Hill Historic District |
| Main Street Historic District | Map | Main Street Historic District |
| Tolland | Map | |
| Tolland Green Historic District | Map | Tolland Green Historic District |
| Vernon | Map | |
| Rogers House | Map | Rogers House |
| Skinner Hammond House | Map | Skinner Hammond House |
| Sparks House | Map | Sparks House |
| Talcottville Historic District | Map | Talcottville Historic District |
| The Beach House | Map | The Beach House |
| The Thrall Farm | Map | The Thrall Farm |
| Valley Falls Farm | Map | Valley Falls Farm |
| Vernon Center Kindergarten | Map | Vernon Center Kindergarten |
| Vernon Grange No. 52 | Map | Vernon Grange No. 52 |
| Wallingford | Map | |
| Franklin Johnson Mansion | Map | Franklin Johnson Mansion |
| Joseph Blakeslee House | Map | Joseph Blakeslee House |
| Nehemiah Royce House | Map | Nehemiah Royce House |
| Washington | Map | |
| Calhoun-Ives Street Historic District | Map | Calhoun-Ives Street Historic District |
| Sunny Ridge Historic District | Map | Sunny Ridge Historic District |
| Washington Green Historic District | Map | Washington Green Historic District |
| Waterford | Map | |
| Jordan Park House | Map | Jordan Park House |
| Nevins Tenant House | Map | Nevins Tenant House |
| Walnut Grove | Map | Walnut Grove |
| Watertown | Map | |
| Watertown Historic District | Map | Watertown Historic District |
| West Hartford | Map | |
| Boulevard-Raymond Road Historic District | Map | Boulevard-Raymond Road Historic District |
| Brace- Cadwell House | Map | Brace- Cadwell House |
| Buena Vista Historic District | Map | Buena Vista Historic District |
| Duffy House | Map | Duffy House |
| Elisha Seymour Jr. House | Map | Elisha Seymour Jr. House |
| Goodwin House | Map | Goodwin House |
| Millard House | Map | Millard House |
| Steele House | Map | Steele House |
| Timothy Goodman House | Map | Timothy Goodman House |
| West Hill Drive Historic District | Map | West Hill Drive Historic District |
| Weston | Map | |
| Bradley Edge Tool Company Historic District | Map | Bradley Edge Tool Company Historic District |
| Den Historic District | Map | Den Historic District |
| Kettle Creek Historic District | Map | Kettle Creek Historic District |
| Lyons Plains Historic District | Map | Lyons Plains Historic District |
| Weston Center Historic District | Map | Weston Center Historic District |
| Westport | Map | |
| 20 and 26 Morningside Drive South Historic District | Map | 20 and 26 Morningside Drive South Historic District |
| Adams Academy | Map | Adams Academy |
| Allen House | Map | Allen House |
| Alvilde and John Hunt House | Map | Alvilde and John Hunt House |
| Batterson-Brotherton House | Map | Batterson-Brotherton House |
| Easton Road Toll House | Map | Easton Road Toll House |
| Edward Burr House/Capt. Thomas Nash House | Map | Edward Burr House/Capt. Thomas Nash House |
| Emily McLaury House | Map | Emily McLaury House |
| Evergreen Avenue Historic District | Map | Evergreen Avenue Historic District |
| Gorham Avenue Historic District | Map | Gorham Avenue Historic District |
| Jesup Road Historic District | Map | Jesup Road Historic District |
| Kings Highway North Historic District | Map | Kings Highway North Historic District |
| Lower Green's Farms Colonial Burying Ground | Map | Lower Green's Farms Colonial Burying Ground |
| Machamux Boulder- West Parish Common | Map | Machamux Boulder- West Parish Common |
| Meeker Elmwood House | Map | Meeker Elmwood House |
| Morehouse Taylor House | Map | Morehouse Taylor House |
| New Town Common | Map | New Town Common |
| John Osborn House | Map | John Osborn House |
| Morehouse-Jennings House | Map | Morehouse-Jennings House |
| Violet Lane Historic District | Map | Violet Lane Historic District |
| Wakeman Farm | Map | Wakeman Farm |
| Greens Farms (West Parish) Meeting House Historic Property | Map | Greens Farms (West Parish) Meeting House Historic Property |
| Bradley-Wheeler House and Barn | Map | Bradley-Wheeler House and Barn |
| Chapman-Northrup House | Map | Chapman-Northrup House |
| Lincoln Street - Riverside Avenue Local Historic District | Map | Lincoln Street - Riverside Avenue Local Historic District |
| Kemper-Gunn House | Map | Kemper-Gunn House |
| Mills-Catalano House | Map | Mills-Catalano House |
| Minute Man Monument | Map | Minute Man Monument |
| Sturges-Wright House | Map | Sturges-Wright House |
| Wethersfield | Map | |
| Old Wethersfield Historic District | Map | Old Wethersfield Historic District |
| Willington | Map | |
| Willington Common Historic District | Map | Willington Common Historic District |
| Wilton | Map | |
| LHD #1 Lambert Corners District | Map | LHD #1 Lambert Corners District |
| LHD #2 Old Town Hall District | Map | LHD #2 Old Town Hall District |
| LHD #3 & #5 Wilton Historical Society Complex | Map | LHD #3 & #5 Wilton Historical Society Complex |
| LHD #6 & #7 Georgetown | Map | LHD #6 & #7 Georgetown |
| LHD #4 Hurlbutt Street Schoolhouse | Map | LHD #4 Hurlbutt Street Schoolhouse |
| Raymond-Ambler Farm (proposed LHD) | Map | Raymond-Ambler Farm (proposed LHD) |
| Windsor | Map | |
| Palisado Historic District | Map | Palisado Historic District |
| Windham | Map | |
| Windham Center Historic District | Map | Windham Center Historic District |
| Woodbury | Map | |
| Woodbury Historic District Number 1 | Map | Woodbury Historic District Number 1 |
| Woodbury Historic District Number 2 | Map | Woodbury Historic District Number 2 |
| Woodstock | Map | |
| Lois Banister House | Map | Lois Banister House |
| Quasset School | Map | Quasset School |
| Woodstock Hill Historic District | Map | Woodstock Hill Historic District |
| Stoneybrooke | Map | |
| Stoneybrooke | Map | |
