| Name | Town | Coordinates | Notes |
|---|
| Andrews Island | Branford | 41°15′48″N 72°45′57″W / 41.26333°N 72.76583°W / 41.26333; -72.76583 | |
| Andrews Island | Stonington | 41°20′00″N 71°57′21″W / 41.33333°N 71.95583°W / 41.33333; -71.95583 | |
| Ball Island | New Haven | 41°18′27″N 72°54′25″W / 41.30750°N 72.90694°W / 41.30750; -72.90694 | Mill River |
| Barn Island | Stonington | 41°19′46″N 71°52′06″W / 41.32944°N 71.86833°W / 41.32944; -71.86833 | |
| Barton Island | Griswold | 41°33′29″N 71°53′53″W / 41.55806°N 71.89806°W / 41.55806; -71.89806 | Pachaug Pond |
| Bear Island | Branford | 41°15′29″N 72°44′21″W / 41.25806°N 72.73917°W / 41.25806; -72.73917 | Part of Thimble Islands |
| Beers Island | Branford | 41°15′25″N 72°44′38″W / 41.25694°N 72.74389°W / 41.25694; -72.74389 | Part of Thimble Islands |
| Belden Island | Branford | 41°15′47″N 72°45′42″W / 41.26306°N 72.76167°W / 41.26306; -72.76167 | |
| Betts Island | Norwalk | 41°04′13″N 73°23′29″W / 41.07028°N 73.39139°W / 41.07028; -73.39139 | Part of Norwalk Islands |
| Bluff Island | Greenwich | 41°00′38″N 73°35′55″W / 41.01056°N 73.59861°W / 41.01056; -73.59861 | |
| Bowers Island | Greenwich | 40°59′45″N 73°38′04″W / 40.99583°N 73.63444°W / 40.99583; -73.63444 | |
| Brockway Island | Essex | 41°22′24″N 72°22′35″W / 41.37333°N 72.37639°W / 41.37333; -72.37639 | Connecticut River |
| Burr Island | Branford | 41°15′48″N 72°45′17″W / 41.26333°N 72.75472°W / 41.26333; -72.75472 | |
| Calf Islands | Greenwich | 40°59′30″N 73°38′23″W / 40.99167°N 73.63972°W / 40.99167; -73.63972 | |
| Calf Pasture Island | Norwalk | 41°04′57″N 73°23′01″W / 41.08250°N 73.38361°W / 41.08250; -73.38361 | Part of Norwalk Islands |
| Calves Island | Old Lyme | 41°19′35″N 72°20′41″W / 41.32639°N 72.34472°W / 41.32639; -72.34472 | Connecticut River |
| Candlewood Isle | New Fairfield | 41°28′52″N 73°27′15″W / 41.48111°N 73.45417°W / 41.48111; -73.45417 | Candlewood Lake |
| Canfield Island | Norwalk/Westport | 41°05′49″N 73°22′58″W / 41.09694°N 73.38278°W / 41.09694; -73.38278 | |
| Carting Island | Stratford | 41°12′48″N 73°06′47″W / 41.21333°N 73.11306°W / 41.21333; -73.11306 | Housatonic River |
| Cat Island | Branford | 41°15′15″N 72°44′20″W / 41.25417°N 72.73889°W / 41.25417; -72.73889 | Part of Thimble Islands |
| Cedar Hammock | Norwalk | 41°04′10″N 73°25′04″W / 41.06944°N 73.41778°W / 41.06944; -73.41778 | |
| Cedar Island | Branford | 41°15′30″N 72°45′39″W / 41.25833°N 72.76083°W / 41.25833; -72.76083 | |
| Cedar Island | Brookfield | 41°31′43″N 73°26′31″W / 41.52861°N 73.44194°W / 41.52861; -73.44194 | New Milford Bay |
| Cedar Island | Clinton | 41°15′56″N 72°31′33″W / 41.26556°N 72.52583°W / 41.26556; -72.52583 | Connected to mainland by landfill |
| Charles Island | Milford | 41°11′27″N 73°03′17″W / 41.19083°N 73.05472°W / 41.19083; -73.05472 | Connected by sandbar to mainland during low tide. |
| Chauncey Island | Ridgefield | 41°19′22″N 73°30′21″W / 41.32278°N 73.50583°W / 41.32278; -73.50583 | Lake Naraneka |
| Chimon Island | Norwalk | 41°03′57″N 73°23′30″W / 41.06583°N 73.39167°W / 41.06583; -73.39167 | Part of Norwalk Islands |
| Clam Island | Branford | 41°14′51″N 72°48′54″W / 41.24750°N 72.81500°W / 41.24750; -72.81500 | |
| Clown Island | Torrington | 41°46′07″N 73°06′44″W / 41.76861°N 73.11222°W / 41.76861; -73.11222 | |
| Cockenoe Island | Westport | 41°05′01″N 73°21′18″W / 41.08361°N 73.35500°W / 41.08361; -73.35500 | Part of Norwalk Islands |
| Copps Island | Norwalk | 41°03′31″N 73°23′13″W / 41.05861°N 73.38694°W / 41.05861; -73.38694 | Part of Norwalk Islands
Connected by sandbar to Crow Island |
| Cove Island | Stamford | 41°02′50″N 73°30′03″W / 41.04722°N 73.50083°W / 41.04722; -73.50083 | |
| Crab Island | Darien | 41°03′01″N 73°27′41″W / 41.05028°N 73.46139°W / 41.05028; -73.46139 | |
| Crow Island | Norwalk | 41°03′40″N 73°23′26″W / 41.06111°N 73.39056°W / 41.06111; -73.39056 | Part of Norwalk Islands
Connected by sandbar to Chimon Island and Copps Island |
| Curatole Island | New Hartford | 41°52′46″N 73°02′37″W / 41.87944°N 73.04361°W / 41.87944; -73.04361 | West Hill Pond |
| Cut in Two Island | Branford | 41°15′30″N 72°44′45″W / 41.25833°N 72.74583°W / 41.25833; -72.74583 | Part of Thimble Islands |
| Cuties Island (Vincent Island) | Stamford | 41°02′08″N 73°30′36″W / 41.03556°N 73.51000°W / 41.03556; -73.51000 | Also a ghost town. |
| Davis Island | Branford | 41°15′20″N 72°44′44″W / 41.25556°N 72.74556°W / 41.25556; -72.74556 | Part of Thimble Islands |
| Deer Island | Sherman | 41°32′14″N 73°27′50″W / 41.53722°N 73.46389°W / 41.53722; -73.46389 | Candlewood Lake |
| Deer Island | Litchfield | 41°41′48″N 73°13′42″W / 41.69667°N 73.22833°W / 41.69667; -73.22833 | Bantam Lake |
| Diving Island | Greenwich | 41°00′48″N 73°35′58″W / 41.01333°N 73.59944°W / 41.01333; -73.59944 | |
| Dodges Island | Stonington | 41°19′44″N 71°57′15″W / 41.32889°N 71.95417°W / 41.32889; -71.95417 | |
| Dog Island | Norwalk | 41°03′30″N 73°24′35″W / 41.05833°N 73.40972°W / 41.05833; -73.40972 | Part of Norwalk Islands |
| Dogfish Island | Branford | 41°15′25″N 72°44′49″W / 41.25694°N 72.74694°W / 41.25694; -72.74694 | Part of Thimble Islands |
| Duck Island | Westbrook | 41°15′22″N 72°28′30″W / 41.25611°N 72.47500°W / 41.25611; -72.47500 | |
| Duck Island | Milford | 41°10′27″N 73°06′30″W / 41.17417°N 73.10833°W / 41.17417; -73.10833 | Charles E. Wheeler Wildlife Management Area |
| Dunks Island | Old Saybrook | 41°16′48″N 72°22′54″W / 41.28000°N 72.38167°W / 41.28000; -72.38167 | Wetlands off Plum Back River |
| East Crib | Branford | 41°15′11″N 72°45′12″W / 41.25306°N 72.75333°W / 41.25306; -72.75333 | Part of Thimble Islands |
| East Stooping Bush Island | Branford | 41°15′04″N 72°44′50″W / 41.25111°N 72.74722°W / 41.25111; -72.74722 | Part of Thimble Islands |
| Elihu Island | Stonington | 41°20′12″N 71°53′14″W / 41.33667°N 71.88722°W / 41.33667; -71.88722 | |
| Enders Island | Stonington | 41°19′20″N 71°57′46″W / 41.32222°N 71.96278°W / 41.32222; -71.96278 | |
| Eustasia Island | Lyme | 41°23′32″N 72°25′13″W / 41.39222°N 72.42028°W / 41.39222; -72.42028 | Connecticut River |
| Falkner Island | Guilford | 41°12′41″N 72°39′18″W / 41.21139°N 72.65500°W / 41.21139; -72.65500 | |
| Fayerweather Island | Bridgeport | 41°8′35″N 73°12′58″W / 41.14306°N 73.21611°W / 41.14306; -73.21611 | Long Island Sound near Black Rock Harbor. |
| Fish Islands | Darien | 41°02′54″N 73°27′26″W / 41.04833°N 73.45722°W / 41.04833; -73.45722 | |
| Foskett Island | Guilford | 41°15′29″N 72°42′40″W / 41.25806°N 72.71111°W / 41.25806; -72.71111 | |
| Fowler Island | Milford | 41°14′13″N 73°06′08″W / 41.23694°N 73.10222°W / 41.23694; -73.10222 | Housatonic River |
| Fox Island | Lebanon | 41°38′23″N 72°18′27″W / 41.63972°N 72.30750°W / 41.63972; -72.30750 | Williams Pond |
| Frisbie Island | Branford | 41°15′46″N 72°45′18″W / 41.26278°N 72.75500°W / 41.26278; -72.75500 | |
| Gates Island | Groton | 41°18′55″N 71°58′01″W / 41.31528°N 71.96694°W / 41.31528; -71.96694 | |
| Gildersleeve Island | Portland | 41°36′21″N 72°36′52″W / 41.60583°N 72.61444°W / 41.60583; -72.61444 | Connecticut River |
| Goat Island | Stonington | 41°20′27″N 71°53′07″W / 41.34083°N 71.88528°W / 41.34083; -71.88528 | |
| Goodyear Island | New Milford/Bridgewater | 41°32′16″N 73°24′15″W / 41.53778°N 73.40417°W / 41.53778; -73.40417 | Lake Lillinonah (Housatonic River) |
| Goose Island | Greenwich | 41°01′00″N 73°35′57″W / 41.01667°N 73.59917°W / 41.01667; -73.59917 | |
| Goose Island | Stratford | 41°11′39″N 73°07′01″W / 41.19417°N 73.11694°W / 41.19417; -73.11694 | Housatonic River |
| Goose Island | Old Lyme | 41°20′10″N 72°20′56″W / 41.33611°N 72.34889°W / 41.33611; -72.34889 | Connecticut River |
| Goose Island | Westport | 41°04′18″N 73°22′17″W / 41.07167°N 73.37139°W / 41.07167; -73.37139 | Part of Norwalk Islands |
| Gorham Island | Westport | 41°08′38″N 73°21′47″W / 41.14389°N 73.36306°W / 41.14389; -73.36306 | Saugatuck River |
| Governor Island | Branford | 41°15′17″N 72°45′21″W / 41.25472°N 72.75583°W / 41.25472; -72.75583 | Part of Thimble Islands |
| Governors Island | Hampton | 41°47′30″N 72°05′03″W / 41.79167°N 72.08417°W / 41.79167; -72.08417 | Pine Acres Lake |
| Grannis Island | New Haven | | Quinnipiac River |
| Grass Island | Stamford | 41°01′35″N 73°32′22″W / 41.02639°N 73.53944°W / 41.02639; -73.53944 | |
| Grassy Island | Norwalk/Westport | 41°04′13″N 73°23′00″W / 41.07028°N 73.38333°W / 41.07028; -73.38333 | Part of Norwalk Islands |
| Great Captain Island | Greenwich | 40°58′56″N 73°37′43″W / 40.98222°N 73.62861°W / 40.98222; -73.62861 | |
| Great Island | Old Lyme | 41°17′17″N 72°19′56″W / 41.28806°N 72.33222°W / 41.28806; -72.33222 | |
| Green Island | Branford | 41°15′19″N 72°50′35″W / 41.25528°N 72.84306°W / 41.25528; -72.84306 | |
| Green Island | Sherman | 41°32′53″N 73°28′07″W / 41.54806°N 73.46861°W / 41.54806; -73.46861 | Candlewood Lake |
| Greenaway Island (Caritas Island) | Stamford | 41°02′12″N 73°30′20″W / 41.03667°N 73.50556°W / 41.03667; -73.50556 | |
| Greenwich Island | Greenwich | 41°00′44″N 73°34′37″W / 41.01222°N 73.57694°W / 41.01222; -73.57694 | |
| Griswold Island | East Lyme | 41°17′40″N 72°13′27″W / 41.29444°N 72.22417°W / 41.29444; -72.22417 | |
| Haddam Island | Haddam | 41°29′30″N 72°31′05″W / 41.49167°N 72.51806°W / 41.49167; -72.51806 | Connecticut River |
| Hall Island | Stonington | 41°19′39″N 71°51′04″W / 41.32750°N 71.85111°W / 41.32750; -71.85111 | Pawcatuck River |
| Hen Island | Branford | 41°15′14″N 72°44′48″W / 41.25389°N 72.74667°W / 41.25389; -72.74667 | Part of Thimble Islands |
| High Island | Branford | 41°14′57″N 72°45′28″W / 41.24917°N 72.75778°W / 41.24917; -72.75778 | Part of Thimble Islands |
| Hobs Island | Groton | 41°19′19″N 72°04′33″W / 41.32194°N 72.07583°W / 41.32194; -72.07583 | Thames River |
| Holly Hock Island | Norwich | 41°31′39″N 72°05′11″W / 41.52750°N 72.08639°W / 41.52750; -72.08639 | Yantic River |
| Horse Island | Greenwich | 41°00′50″N 73°36′17″W / 41.01389°N 73.60472°W / 41.01389; -73.60472 | |
| Horse Island | Branford | 41°14′40″N 72°45′27″W / 41.24444°N 72.75750°W / 41.24444; -72.75750 | Part of Thimble Islands |
| Horse Island | Guilford | 41°15′28″N 72°42′23″W / 41.25778°N 72.70639°W / 41.25778; -72.70639 | |
| Hoyt Island | Norwalk | 41°04′26″N 73°25′09″W / 41.07389°N 73.41917°W / 41.07389; -73.41917 | |
| Huntley Island | East Lyme | 41°17′50″N 72°13′26″W / 41.29722°N 72.22389°W / 41.29722; -72.22389 | |
| Inner White Top | Guilford | 41°15′30″N 72°40′13″W / 41.25833°N 72.67028°W / 41.25833; -72.67028 | |
| Jack Island | Stamford | 41°01′51″N 73°32′08″W / 41.03083°N 73.53556°W / 41.03083; -73.53556 | |
| Johnson Island | Branford | 41°14′49″N 72°44′58″W / 41.24694°N 72.74944°W / 41.24694; -72.74944 | Part of Thimble Islands |
| Kelsey Island | Branford | 41°15′00″N 72°51′11″W / 41.25000°N 72.85306°W / 41.25000; -72.85306 | |
| Kings Island | Enfield/Suffield | 41°57′17″N 72°36′45″W / 41.95472°N 72.61250°W / 41.95472; -72.61250 | Connecticut River |
| Kitts Island | Westport | 41°06′23″N 73°22′04″W / 41.10639°N 73.36778°W / 41.10639; -73.36778 | |
| L'Hammock Island | Norwalk | 41°03′17″N 73°24′30″W / 41.05472°N 73.40833°W / 41.05472; -73.40833 | Part of Norwalk Islands |
| Lewis Island | Branford | 41°15′50″N 72°45′48″W / 41.26389°N 72.76333°W / 41.26389; -72.76333 | |
| Little Captain Island | Greenwich | 40°59′19″N 73°36′41″W / 40.98861°N 73.61139°W / 40.98861; -73.61139 | |
| Little Hammock Island | Norwalk | 41°03′15″N 73°24′14″W / 41.05417°N 73.40389°W / 41.05417; -73.40389 | Part of Norwalk Islands |
| Little Tavern Island | Norwalk | 41°03′47″N 73°25′11″W / 41.06306°N 73.41972°W / 41.06306; -73.41972 | Part of Norwalk Islands |
| Long Island | Stratford | 41°13′05″N 73°06′48″W / 41.21806°N 73.11333°W / 41.21806; -73.11333 | Housatonic River |
| Lord Island | East Haddam | 41°26′10″N 72°27′04″W / 41.43611°N 72.45111°W / 41.43611; -72.45111 | Connecticut River |
| Lovers Island | Branford | 41°15′17″N 72°49′52″W / 41.25472°N 72.83111°W / 41.25472; -72.83111 | |
| Lyddy Island | Groton | 41°19′53″N 71°56′47″W / 41.33139°N 71.94639°W / 41.33139; -71.94639 | |
| Major Island | Stonington | 41°21′36″N 71°50′18″W / 41.36000°N 71.83833°W / 41.36000; -71.83833 | Pawcatuck River |
| Marine Island | Branford | 41°14′50″N 72°45′02″W / 41.24722°N 72.75056°W / 41.24722; -72.75056 | Part of Thimble Islands |
| Marvin Island | Old Lyme | 41°17′58″N 72°20′13″W / 41.29944°N 72.33694°W / 41.29944; -72.33694 | Connecticut River |
| Mason's Island | Stonington | 41°19′58″N 71°58′01″W / 41.33278°N 71.96694°W / 41.33278; -71.96694 | |
| Menunketesuck Island | Westbrook | 41°15′51″N 72°27′51″W / 41.26417°N 72.46417°W / 41.26417; -72.46417 | |
| Mine Island | Meriden | 41°33′23″N 72°49′37″W / 41.55639°N 72.82694°W / 41.55639; -72.82694 | Merimere Reservoir |
| Minnie Island | Montville | 41°30′21″N 72°13′19″W / 41.50583°N 72.22194°W / 41.50583; -72.22194 | Gardner Lake |
| Money Island | Branford | 41°14′58″N 72°45′06″W / 41.24944°N 72.75167°W / 41.24944; -72.75167 | Part of the Thimble Islands |
| Mouse Island | Groton | 41°18′54″N 71°59′29″W / 41.31500°N 71.99139°W / 41.31500; -71.99139 | |
| Ned Island | Darien | 41°02′51″N 73°28′33″W / 41.04750°N 73.47583°W / 41.04750; -73.47583 | |
| Nells Island | Milford | 41°11′05″N 73°06′58″W / 41.18472°N 73.11611°W / 41.18472; -73.11611 | Charles E. Wheeler Wildlife Management Area |
| North Brother | East Lyme | 41°17′34″N 72°14′41″W / 41.29278°N 72.24472°W / 41.29278; -72.24472 | |
| Nott Island | Old Lyme | 41°21′00″N 72°22′21″W / 41.35000°N 72.37250°W / 41.35000; -72.37250 | Connecticut River |
| Oak Island | New Milford | 41°31′33″N 73°26′32″W / 41.52583°N 73.44222°W / 41.52583; -73.44222 | Candlewood Lake |
| Outer Island | Branford | 41°14′31″N 72°45′37″W / 41.24194°N 72.76028°W / 41.24194; -72.76028 | Part of Thimble Islands |
| Paquabaug | Roxbury | 41°33′25″N 73°19′49″W / 41.55694°N 73.33028°W / 41.55694; -73.33028 | Shepaug River |
| Peach Island | Norwalk | 41°04′58″N 73°24′19″W / 41.08278°N 73.40528°W / 41.08278; -73.40528 | In Norwalk Harbor |
| Peacock Island | Stratford | 41°12′43″N 73°06′55″W / 41.21194°N 73.11528°W / 41.21194; -73.11528 | Housatonic River |
| Peagscomsuck Island | Canterbury | 41°40′25″N 71°57′11″W / 41.67361°N 71.95306°W / 41.67361; -71.95306 | Quinebaug River |
| Pelican Island | Greenwich | 41°00′31″N 73°35′05″W / 41.00861°N 73.58472°W / 41.00861; -73.58472 | |
| Pine Island | Groton | 41°18′48″N 72°03′30″W / 41.31333°N 72.05833°W / 41.31333; -72.05833 | |
| Pine Island | New Fairfield | 41°28′20″N 73°26′44″W / 41.47222°N 73.44556°W / 41.47222; -73.44556 | Candlewood Lake |
| Pope's Flat | Stratford | 41°13′10″N 73°06′37″W / 41.21944°N 73.11028°W / 41.21944; -73.11028 | Housatonic River |
| Pot Island | Branford | 41°14′53″N 72°45′17″W / 41.24806°N 72.75472°W / 41.24806; -72.75472 | Part of Thimble Islands |
| Potato Island | Branford | 41°15′23″N 72°45′29″W / 41.25639°N 72.75806°W / 41.25639; -72.75806 | Part of Thimble Islands |
| Powder Island | New London | 41°20′24″N 72°05′32″W / 41.34000°N 72.09222°W / 41.34000; -72.09222 | Thames River |
| Ram Island | Stonington | 41°18′48″N 71°58′44″W / 41.31333°N 71.97889°W / 41.31333; -71.97889 | |
| Rat Island | Lyme | 41°21′15″N 72°21′40″W / 41.35417°N 72.36111°W / 41.35417; -72.36111 | Connecticut River |
| Rich Island | Greenwich | 41°00′11″N 73°38′38″W / 41.00306°N 73.64389°W / 41.00306; -73.64389 | |
| Rich Island | East Haddam | 41°26′20″N 72°27′07″W / 41.43889°N 72.45194°W / 41.43889; -72.45194 | Connecticut River |
| Rock Island | Stonington | 41°19′50″N 71°56′04″W / 41.33056°N 71.93444°W / 41.33056; -71.93444 | |
| Rock Island | Bridgewater | 41°31′26″N 73°26′16″W / 41.52389°N 73.43778°W / 41.52389; -73.43778 | Candlewood Lake |
| Rogers Island | Branford | 41°15′33″N 72°45′46″W / 41.25917°N 72.76278°W / 41.25917; -72.76278 | Part of Thimble Islands |
| Saint Helena Island | Branford | 41°15′50″N 72°46′15″W / 41.26389°N 72.77083°W / 41.26389; -72.77083 | |
| Salt Island | Westbrook | 41°16′31″N 72°26′30″W / 41.27528°N 72.44167°W / 41.27528; -72.44167 | |
| Sandy Hammock | Norwalk | 41°03′49″N 73°24′27″W / 41.06361°N 73.40750°W / 41.06361; -73.40750 | Part of Norwalk Islands |
| Sandy Point | Stonington | 41°19′52″N 71°53′47″W / 41.33111°N 71.89639°W / 41.33111; -71.89639 | Extends into Rhode Island |
| Scraggy Island | East Hampton | 41°35′59″N 72°30′11″W / 41.59972°N 72.50306°W / 41.59972; -72.50306 | Pocotopaug Lake |
| Sedge Island | Branford | 41°14′54″N 72°48′39″W / 41.24833°N 72.81083°W / 41.24833; -72.81083 | |
| Shea Island | Norwalk | 41°03′36″N 73°24′08″W / 41.06000°N 73.40222°W / 41.06000; -73.40222 | Part of Norwalk Islands |
| Sheffield Island | Norwalk | 41°03′05″N 73°24′58″W / 41.05139°N 73.41611°W / 41.05139; -73.41611 | Part of Norwalk Islands |
| Sherwood Island | Westport | 41°06′53″N 73°19′51″W / 41.11472°N 73.33083°W / 41.11472; -73.33083 | |
| Shore Island | Greenwich | 41°00′00″N 73°38′38″W / 41.00000°N 73.64389°W / 41.00000; -73.64389 | |
| Sixpenny Island | Groton | 41°20′03″N 71°58′49″W / 41.33417°N 71.98028°W / 41.33417; -71.98028 | |
| Smith Island | Branford | 41°15′20″N 72°44′23″W / 41.25556°N 72.73972°W / 41.25556; -72.73972 | Part of Thimble Islands |
| South Brother | East Lyme | 41°17′22″N 72°14′22″W / 41.28944°N 72.23944°W / 41.28944; -72.23944 | |
| Spectacle Island | Branford | 41°14′45″N 72°48′15″W / 41.24583°N 72.80417°W / 41.24583; -72.80417 | |
| Sprite Island | Westport | 41°05′23″N 73°22′52″W / 41.08972°N 73.38111°W / 41.08972; -73.38111 | |
| Stone Island | Clinton | 41°15′13″N 72°30′47″W / 41.25361°N 72.51306°W / 41.25361; -72.51306 | |
| Stony Island | East Haven | 41°14′24″N 72°51′48″W / 41.24000°N 72.86333°W / 41.24000; -72.86333 | |
| Sumac Island | Branford | 41°14′48″N 72°48′35″W / 41.24667°N 72.80972°W / 41.24667; -72.80972 | |
| Tavern Island | Norwalk | 41°03′38″N 73°25′16″W / 41.06056°N 73.42111°W / 41.06056; -73.42111 | Part of Norwalk Islands |
| Thatchbed Island | Essex | 41°20′47″N 72°23′00″W / 41.34639°N 72.38333°W / 41.34639; -72.38333 | Connecticut River |
| The Plans | Norwalk | 41°03′10″N 73°24′17″W / 41.05278°N 73.40472°W / 41.05278; -73.40472 | Part of Norwalk Islands
Connected by sandbar to Shea and Sheffield islands |
| Thistle Island | Sherman | 41°33′26″N 73°28′50″W / 41.55722°N 73.48056°W / 41.55722; -73.48056 | Candlewood Lake |
| Tree Hammock | Norwalk | 41°03′52″N 73°24′18″W / 41.06444°N 73.40500°W / 41.06444; -73.40500 | Part of Norwalk Islands |
| Tree Island (Unofficial Name) | Wolcott | 41° 38' 18" N 72° 57' 56" W | Cedar Lake |
| Turks Island | East Windsor | 41°53′41″N 72°37′13″W / 41.89472°N 72.62028°W / 41.89472; -72.62028 | Connecticut River |
| Tuxis Island | Madison | 41°15′57″N 72°36′06″W / 41.26583°N 72.60167°W / 41.26583; -72.60167 | |
| Tweed Island | Greenwich | 41°00′31″N 73°36′58″W / 41.00861°N 73.61611°W / 41.00861; -73.61611 | |
| Twin Islands | East Hampton | 41°35′37″N 72°30′15″W / 41.59361°N 72.50417°W / 41.59361; -72.50417 | Pocotopaug Lake |
| Twotree Island | Waterford | 41°17′40″N 72°09′09″W / 41.29444°N 72.15250°W / 41.29444; -72.15250 | |
| Umbrella Island | Branford | 41°14′59″N 72°50′31″W / 41.24972°N 72.84194°W / 41.24972; -72.84194 | |
| Walden Island | Preston | 41°28′07″N 72°04′04″W / 41.46861°N 72.06778°W / 41.46861; -72.06778 | Thames River |
| Waterford Island | East Lyme | 41°18′57″N 72°10′42″W / 41.31583°N 72.17833°W / 41.31583; -72.17833 | |
| Watts Island | East Lyme | 41°17′56″N 72°13′13″W / 41.29889°N 72.22028°W / 41.29889; -72.22028 | |
| Wayland Island | Branford | 41°15′12″N 72°44′38″W / 41.25333°N 72.74389°W / 41.25333; -72.74389 | Part of Thimble Islands |
| Wee Captain Island | Greenwich | 40°59′25″N 73°36′32″W / 40.99028°N 73.60889°W / 40.99028; -73.60889 | |
| West Crib | Branford | 41°15′06″N 72°45′18″W / 41.25167°N 72.75500°W / 41.25167; -72.75500 | Part of Thimble Islands |
| Wheeler Island | Branford | 41°15′35″N 72°45′09″W / 41.25972°N 72.75250°W / 41.25972; -72.75250 | |
| Wilcox Island | Middletown
Portland
Cromwell | 41°34′29″N 72°38′56″W / 41.57472°N 72.64889°W / 41.57472; -72.64889 | Connecticut River |
| Wilson Head | Greenwich | 41°00′01″N 73°38′25″W / 41.00028°N 73.64028°W / 41.00028; -73.64028 | |
| Wintergreen Island | Winchester | 41°54′29″N 73°05′41″W / 41.90806°N 73.09472°W / 41.90806; -73.09472 | Highland Lake |
| Wood Island | Norwalk | 41°03′23″N 73°24′18″W / 41.05639°N 73.40500°W / 41.05639; -73.40500 | Part of Norwalk Islands |
| Wooster Island | Orange | 41°16′50″N 73°04′58″W / 41.28056°N 73.08278°W / 41.28056; -73.08278 | Housatonic River |
