List of all settlements:
- Acton, Suffolk
- Aldeburgh, Suffolk
- Amagansett, Suffolk
- Amityville, Suffolk
- Aquebogue, Suffolk
- Asharoken, Suffolk
- Babylon, Suffolk
- Bacton, Suffolk
- Badwell Ash, Suffolk
- Baiting Hollow, Suffolk
- Bardwell, Suffolk
- Barnby, Suffolk
- Barningham, Suffolk
- Barrow, Suffolk
- Barton Mills, Suffolk
- Bay Shore, Suffolk
- Bayport, Suffolk
- Baywood, Suffolk
- Beccles, Suffolk
- Belle Terre, Suffolk
- Bellport, Suffolk
- Bentley, Suffolk
- Beyton, Suffolk
- Bildeston, Suffolk
- Blue Point, Suffolk
- Blundeston, Suffolk
- Bohemia, Suffolk
- Boston, Suffolk
- Boxford, Suffolk
- Bramford, Suffolk
- Brandon, Suffolk
- Brantham, Suffolk
- Brentwood, Suffolk
- Bridgehampton, Suffolk
- Brightwaters, Suffolk
- Brookhaven, Suffolk
- Bucklesham, Suffolk
- Bungay, Suffolk
- Bury St Edmunds, Suffolk
- Calverton, Suffolk
- Capel St Mary, Suffolk
- Carlton, Suffolk
- Cavendish, Suffolk
- Center Moriches, Suffolk
- Centereach, Suffolk
- Centerport, Suffolk
- Central Islip, Suffolk
- Chedburgh, Suffolk
- Chelmondiston, Suffolk
- Chelsea, Suffolk
- Clare, Suffolk
- Claydon, Suffolk
- Coddenham, Suffolk
- Cold Spring Harbor, Suffolk
- Coldfair Green, Suffolk
- Commack, Suffolk
- Copiague, Suffolk
- Coram, Suffolk
- Culford, Suffolk
- Cutchogue, Suffolk
- Debenham, Suffolk
- Deer Park, Suffolk
- Dix Hills, Suffolk
- Drinkstone Green, Suffolk
- East Bergholt, Suffolk
- East Farmingdale, Suffolk
- East Hampton, Suffolk
- East Hampton North, Suffolk
- East Islip, Suffolk
- East Marion, Suffolk
- East Moriches, Suffolk
- East Northport, Suffolk
- East Patchogue, Suffolk
- East Quogue, Suffolk
- East Shoreham, Suffolk
- Eastport, Suffolk
- Eatons Neck, Suffolk
- Elmsett, Suffolk
- Elmswell, Suffolk
- Elwood, Suffolk
- Eye, Suffolk
- Farmingville, Suffolk
- Felixstowe, Suffolk
- Fire Island, Suffolk
- Fishers Island, Suffolk
- Flanders, Suffolk
- Fornham All Saints, Suffolk
- Fornham St Martin, Suffolk
- Fort Salonga, Suffolk
- Framlingham, Suffolk
- Fressingfield, Suffolk
- Gazeley, Suffolk
- Gilgo, Suffolk
- Gislingham, Suffolk
- Glemsford, Suffolk
- Gordon Heights, Suffolk
- Great Blakenham, Suffolk
- Great Finborough, Suffolk
- Great River, Suffolk
- Great Waldingfield, Suffolk
- Greenlawn, Suffolk
- Greenport, Suffolk
- Greenport West, Suffolk
- Grundisburgh, Suffolk
- Hadleigh, Suffolk
- Halesite, Suffolk
- Halesworth, Suffolk
- Hampton Bays, Suffolk
- Haughley, Suffolk
- Hauppauge, Suffolk
- Haverhill, Suffolk
- Head of the Harbor, Suffolk
- Heckfield Green, Suffolk
- Henley, Suffolk
- Hepworth, Suffolk
- Highpoint Prison, Suffolk
- Hitcham, Suffolk
- Holbrook, Suffolk
- Holbrook, Suffolk
- Hollesley, Suffolk
- Holtsville, Suffolk
- Honington Airfield, Suffolk
- Hopton, Suffolk
- Horringer, Suffolk
- Hundon, Suffolk
- Huntington, Suffolk
- Huntington Bay, Suffolk
- Huntington Station, Suffolk
- Ipswich, Suffolk
- Islandia, Suffolk
- Islip, Suffolk
- Islip Terrace, Suffolk
- Ixworth, Suffolk
- Jamesport, Suffolk
- Kedington, Suffolk
- Kesgrave, Suffolk
- Kessingland, Suffolk
- Kings Park, Suffolk
- Kirton, Suffolk
- Lake Grove, Suffolk
- Lake Ronkonkoma, Suffolk
- Lakenheath, Suffolk
- Lakenheath Airfield, Suffolk
- Laurel, Suffolk
- Lavenham, Suffolk
- Lawshall, Suffolk
- Laxfield, Suffolk
- Leavenheath, Suffolk
- Leiston, Suffolk
- Lindenhurst, Suffolk
- Lloyd Harbor, Suffolk
- Long Melford, Suffolk
- Lowestoft, Suffolk
- Manorville, Suffolk
- Martlesham, Suffolk
- Mastic, Suffolk
- Mastic Beach, Suffolk
- Mattituck, Suffolk
- Medford, Suffolk
- Mellis, Suffolk
- Melville, Suffolk
- Mendlesham, Suffolk
- Middle Island, Suffolk
- Mildenhall, Suffolk
- Miller Place, Suffolk
- Monks Eleigh, Suffolk
- Montauk, Suffolk
- Moriches, Suffolk
- Moulton, Suffolk
- Mount Sinai, Suffolk
- Napeague, Suffolk
- Nayland, Suffolk
- Needham Market, Suffolk
- Nesconset, Suffolk
- New Suffolk, Suffolk
- Newmarket, Suffolk
- Nissequogue, Suffolk
- North Amityville, Suffolk
- North Babylon, Suffolk
- North Bay Shore, Suffolk
- North Bellport, Suffolk
- North Great River, Suffolk
- North Haven, Suffolk
- North Lindenhurst, Suffolk
- North Patchogue, Suffolk
- North Sea, Suffolk
- Northampton, Suffolk
- Northport, Suffolk
- Northville, Suffolk
- Northwest Harbor, Suffolk
- Norton, Suffolk
- Noyack, Suffolk
- Oak Beach-Captree, Suffolk
- Oakdale, Suffolk
- Occold, Suffolk
- Old Field, Suffolk
- Old Newton, Suffolk
- Onehouse, Suffolk
- Orford, Suffolk
- Orient, Suffolk
- Otley, Suffolk
- Pakenham, Suffolk
- Palgrave, Suffolk
- Patchogue, Suffolk
- Peasenhall, Suffolk
- Peconic, Suffolk
- Poquott, Suffolk
- Port Jefferson, Suffolk
- Port Jefferson Station, Suffolk
- Quiogue, Suffolk
- Quogue, Suffolk
- Red Lodge, Suffolk
- Remsenburg-Speonk, Suffolk
- Rendlesham, Suffolk
- Revere, Suffolk
- Reydon, Suffolk
- Rickinghall, Suffolk
- Ridge, Suffolk
- Risby, Suffolk
- Riverhead, Suffolk
- Riverside, Suffolk
- Rocky Point, Suffolk
- Ronkonkoma, Suffolk
- Royal Hospital School, Suffolk
- Rushmere St Andrew, Suffolk
- Sag Harbor, Suffolk
- Sagaponack, Suffolk
- Saxmundham, Suffolk
- Sayville, Suffolk
- Selden, Suffolk
- Setauket-East Setauket, Suffolk
- Shelter Island, Suffolk
- Shelter Island Heights, Suffolk
- Shinnecock Hills, Suffolk
- Shirley, Suffolk
- Shoreham, Suffolk
- Shotley, Suffolk
- Shotley Gate, Suffolk
- Sicklesmere, Suffolk
- Smithtown, Suffolk
- Somersham, Suffolk
- Sound Beach, Suffolk
- South Huntington, Suffolk
- Southampton, Suffolk
- Southold, Suffolk
- Southwold, Suffolk
- Springs, Suffolk
- Sproughton, Suffolk
- St. James, Suffolk
- Stanton, Suffolk
- Stoke-by-Clare, Suffolk
- Stony Brook, Suffolk
- Stony Brook University, Suffolk
- Stowmarket, Suffolk
- Stowupland, Suffolk
- Stradbroke, Suffolk
- Stratford St Mary, Suffolk
- Stutton, Suffolk
- Sudbury, Suffolk
- Suffolk, Suffolk
- Sutton Common, Suffolk
- Terryville, Suffolk
- Thorndon, Suffolk
- Thurston, Suffolk
- Trimley St Mary, Suffolk
- Tuckahoe, Suffolk
- Ufford, Suffolk
- Village of the Branch, Suffolk
- Wading River, Suffolk
- Wainscott, Suffolk
- Walsham Le Willows, Suffolk
- Washbrook, Suffolk
- Water Mill, Suffolk
- Wattisham Airfield, Suffolk
- West Babylon, Suffolk
- West Bay Shore, Suffolk
- West Hills, Suffolk
- West Islip, Suffolk
- West Sayville, Suffolk
- Westhampton, Suffolk
- Westhampton Beach, Suffolk
- Wetherden, Suffolk
- Wheatley Heights, Suffolk
- Wickham Market, Suffolk
- Wickhambrook, Suffolk
- Winthrop Town, Suffolk
- Woodbridge, Suffolk
- Woolpit, Suffolk
- Worlington, Suffolk
- Worlingworth, Suffolk
- Wrentham, Suffolk
- Wyandanch, Suffolk
- Yaphank, Suffolk
- Yaxley, Suffolk
- Yoxford, Suffolk