| Suffolk County | Nassau County | The Hamptons | 
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| NGL Insurance 112 Merrick Rd Lynbrook NY, 11563 (516) 599-1100 | Niche Brokerage INC 1236 Roanoke Ave Riverhead NY, 11901 (631) 591-2692 | ||
| Nicholas D'Amico Associate INC 35 Ann Dr Syosset NY, 11791 (516) 364-8105 | Nielson & Associates 19 Park Ave Manhasset NY, 11030 (516) 365-6931 | ||
| NIF Group Inc 30 Park Ave Manhasset NY, 11030 (516) 365-7440 | Nina's House of Insurance 829 Long Island Ave Deer Park NY, 11729 (631) 586-9610 | ||
| Nittany Agency Inc 2 Huron St Glen Head NY, 11545 (516) 869-2900 | Noble Insurance Agency 821 W Jericho Tpke Smithtown NY, 11787 (631) 543-1160 | ||
| Norman Levine Associates 30 Sandpiper Walk Bay Shore NY, 11706 (631) 583-8200 | Norman M Fink & CO 1000 Park Blvd Massapequa Park NY, 11762 (516) 798-0055 | ||
| North American Companies Limited 6800 Jericho Tpke Syosset NY, 11791 (516) 921-7106 | North Fork Agency 1265 Sunrise Hwy Bay Shore NY, 11706 (631) 968-7570 | ||
| North Fork Agency 55 W Ames Ct Plainview NY, 11803 (631) 968-7570 | North Fork Title Agency 21 W 2nd St Riverhead NY, 11901 (631) 727-4302 | ||
| North Island Excess & SURPLUS Corporation 30 Park Ave Manhasset NY, 11030 (516) 365-7440 | North Shore Life & Health Agency 585 Garden City NY, 11530 (516) 248-0000 | ||
| North Shore Planning Group LLC 8 Priscilla Ln Port Jefferson Station NY, 11776 (631) 928-3073 | O'Keefe Brian 411 Furrows Rd Holbrook NY, 11741 (631) 580-3276 | ||
| O'Leary W T INC 67 Harned Rd Commack NY, 11725 (631) 864-4265 | O'Malley Financial Services 21 N Ferry Rd Shelter Island NY, 11964 (631) 749-1109 | ||