| Name | Image | Type | Height | Opened | Location | Notes | Coordinates | Refs |
| WFTY-DT tower | | Guyed mast | 681 ft208 m | 1984 | Middle Island | Tallest structure on Long Island, Suffolk County, and Town of Brookhaven | 40°53′23″N 72°57′11″W / 40.8897°N 72.9531°W / 40.8897; -72.9531 | |
| WLNY-TV tower(CBS Communications Services tower) | | Guyed mast | 642 ft196 m | 1985 | Ridge | | 40°53′50″N 72°54′54″W / 40.8973°N 72.9151°W / 40.8973; -72.9151 | |
| Northport Power Station | | Chimney | 620 ft190 m | 1967 | Fort Salonga | Tallest structure in Town of Huntington; tallest freestanding structure on suburban Long Island | 40°55′23″N 73°20′36″W / 40.9231°N 73.3433°W / 40.9231; -73.3433 | |
| WEHM tower | | Guyed mast | 510 ft160 m | 1998 | Manorville | | 40°51′18″N 72°46′09″W / 40.8551°N 72.7691°W / 40.8551; -72.7691 | |
| American Tower tower | | Tower | 500 ft150 m | 2000 | Islip | Tallest structure in Town of Islip | 40°45′06″N 73°12′48″W / 40.7518°N 73.2134°W / 40.7518; -73.2134 | |
| RCA Radio Central antennas | | Tower | 450 ft140 m | 1921 | Rocky Point | Demolished in 1977 | 40°56′05″N 72°55′11″W / 40.9348°N 72.9198°W / 40.9348; -72.9198 | |
| United States Coast Guard Tower | | Tower | 440 ft130 m | 2007 | Hampton Bays | Tallest structure in Town of Southampton | 40°50′54″N 72°30′12″W / 40.8483°N 72.5034°W / 40.8483; -72.5034 | |
| Port Jefferson Power Station | | Chimney | 434 ft132 m | 1948 | Port Jefferson | | 40°57′01″N 73°04′43″W / 40.9502°N 73.0787°W / 40.9502; -73.0787 | |
| KeySpan weather tower | | Guyed mast | 420 ft130 m | 1973 | Jamesport | Tallest structure in Town of Riverhead | 40°59′11″N 72°35′06″W / 40.9864°N 72.585°W / 40.9864; -72.585 | |
| KeySpan weather tower | | Guyed mast | 420 ft130 m | 1973 | East Shoreham | | 40°57′26″N 72°52′57″W / 40.9572°N 72.8825°W / 40.9572; -72.8825 | |
| United States Coast Guard Tower | | Tower | 415 ft126 m | 2006 | Fire Island | Tallest structure on the Outer Barrier | 40°37′29″N 73°15′37″W / 40.6248°N 73.2602°W / 40.6248; -73.2602 | |
| Univision tower | | Tower | 414 ft126 m | 2014 | Islandia | | 40°48′26″N 73°10′46″W / 40.8072°N 73.1794°W / 40.8072; -73.1794 | |
| Grandview Development tower | | Guyed mast | 393 ft120 m | 2006 | Hauppauge | | 40°48′55″N 73°10′42″W / 40.8153°N 73.1783°W / 40.8153; -73.1783 | |
| Reworld Hempstead(Covanta Hempstead) | | Chimney | 382 ft116 m | 1989 | Uniondale | Tallest structure in Nassau County and Town of Hempstead | 40°44′20″N 73°35′24″W / 40.7390°N 73.5899°W / 40.7390; -73.5899 | |
| Suffolk County Police Department tower | | Tower | 380 ft120 m | 1998 | Hauppauge | | 40°48′33″N 73°13′15″W / 40.8093°N 73.2207°W / 40.8093; -73.2207 | |
| Village of Greenport tower | | Guyed mast | 377 ft115 m | 1997 | Greenport | Tallest structure in Town of Southold | 41°06′34″N 72°22′06″W / 41.1094°N 72.3683°W / 41.1094; -72.3683 | |
| WHLI towers | | One guyed mast and two towers | 361 ft110 m | 1985, 2006 | Hempstead | Two towers | 40°41′08″N 73°36′35″W / 40.6856°N 73.6098°W / 40.6856; -73.6098 | |
| Altice USA tower | | Guyed mast | 360 ft110 m | 1969 | Greenport | | 41°06′35″N 72°22′03″W / 41.1097°N 72.3675°W / 41.1097; -72.3675 | |
| Altice USA tower | | Guyed mast | 353 ft108 m | 1969 | East Hampton North | Tallest structure in Town of East Hampton | 40°59′37″N 72°10′17″W / 40.9936°N 72.1714°W / 40.9936; -72.1714 | |
| High-Tower Communications tower | | Tower | 350 ft110 m | 1993 | Farmingville | | 40°50′32″N 73°02′23″W / 40.8422°N 73.0397°W / 40.8422; -73.0397 | |
| E. F. Barrett Power Station | | Chimney | 350 ft110 m | 1963 | Barnum Island | | 40°36′58″N 73°38′50″W / 40.6161°N 73.6473°W / 40.6161; -73.6473 | |
| Suffolk County Water Authority tank | | Water Tower | 341 ft104 m | 2006 | Stony Brook | | 40°54′18″N 73°06′47″W / 40.905°N 73.1131°W / 40.905; -73.1131 | |
| Pinnacle Towers tower | | Guyed mast | 329 ft100 m | 1965 | Dix Hills | | 40°47′00″N 73°22′02″W / 40.7832°N 73.3671°W / 40.7832; -73.3671 | |
| WWSK tower | | Tower | 327 ft100 m | 1998 | Brentwood | | 40°48′08″N 73°17′10″W / 40.8023°N 73.2862°W / 40.8023; -73.2862 | |
| Altice USA tower | | Tower | 327 ft100 m | 1966 | Riverhead | | 40°56′10″N 72°39′10″W / 40.9361°N 72.6528°W / 40.9361; -72.6528 | |
| Altice USA tower | | Tower | 327 ft100 m | 1969 | Southampton | | 40°53′58″N 72°23′04″W / 40.8994°N 72.3844°W / 40.8994; -72.3844 | |
| WALK-FM tower | | Guyed mast | 327 ft100 m | 2002 | Farmingville | | 40°50′41″N 73°01′59″W / 40.8447°N 73.0331°W / 40.8447; -73.0331 | |
| Communications Leasing tower | | Tower | 325 ft99 m | 1982 | Plainview | Tallest structure in Town of Oyster Bay | 40°47′48″N 73°27′47″W / 40.7967°N 73.4631°W / 40.7967; -73.4631 | |
| WLIW tower | | Guyed mast | 325 ft99 m | 2004 | Plainview | | 40°47′19″N 73°27′08″W / 40.7887°N 73.4521°W / 40.7887; -73.4521 | |
| WBWD tower | | Guyed mast | 324 ft99 m | 1969 | Islip | | 40°45′08″N 73°12′48″W / 40.7523°N 73.2134°W / 40.7523; -73.2134 | |
| Communications Leasing tower | | Tower | 320 ft98 m | 1975 | Plainview | | 40°47′44″N 73°27′40″W / 40.7956°N 73.4611°W / 40.7956; -73.4611 | |
| Brookhaven National Laboratory Exhaust Stack | | Chimney | 320 ft98 m | 1950 | Upton | Demolished in 2021 | 40°52′14″N 72°52′33″W / 40.8706°N 72.8758°W / 40.8706; -72.8758 | |
| Mackay Radio Tower | | Tower | 319 ft97 m | 1995 | Napeague | | 40°59′54″N 72°03′06″W / 40.9983°N 72.0518°W / 40.9983; -72.0518 | |
| American Towers tower | | Tower | 310 ft94 m | 1957 | Noyack | | 40°58′11″N 72°20′47″W / 40.9697°N 72.3463°W / 40.9697; -72.3463 | |
| WRCN-FM tower | | Guyed mast | 308 ft94 m | 1982 | Manorville | | 40°51′08″N 72°45′53″W / 40.8522°N 72.7647°W / 40.8522; -72.7647 | |
| AT&T tower | | Tower | 308 ft94 m | 1996 | Noyack | | 40°58′11″N 72°20′47″W / 40.9697°N 72.3464°W / 40.9697; -72.3464 | |
| Communications Leasing tower | | Tower | 305 ft93 m | 1985 | Farmingville | | 40°50′32″N 73°01′33″W / 40.8422°N 73.0258°W / 40.8422; -73.0258 | |
| Catholic Faith Network tower(Telicare tower) | | Tower | 304 ft93 m | 2004 | Central Islip | | 40°48′12″N 73°12′24″W / 40.8032°N 73.2068°W / 40.8032; -73.2068 | |