| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hempstead | 1 | 796,269 | 790,766 | 0.07% | 6,719 | 119 | Town |
| Oyster Bay | 2 | 301,359 | 300,306 | 0.08% | 2,909 | 104 | Town |
| North Hempstead | 3 | 239,359 | 236,843 | 0.16% | 4,470 | 54 | Town |
| Hempstead | 4 | 60,048 | 58,887 | 0.38% | 16,269 | 4 | Village |
| Freeport | 5 | 44,148 | 44,286 | -0.06% | 9,131 | 5 | Village |
| Valley Stream | 6 | 40,348 | 40,480 | -0.08% | 11,601 | 3 | Village |
| Long Beach | 7 | 34,943 | 34,804 | 0.07% | 15,754 | 2 | City |
| Glen Cove | 8 | 28,182 | 28,233 | -0.03% | 4,233 | 7 | City |
| Rockville Centre | 9 | 25,749 | 25,868 | -0.08% | 7,920 | 3 | Village |
| Garden City | 10 | 23,012 | 23,200 | -0.13% | 4,319 | 5 | Village |
| Mineola | 11 | 21,509 | 20,852 | 0.62% | 11,620 | 2 | Village |
| Lynbrook | 12 | 20,952 | 20,440 | 0.47% | 10,408 | 2 | Village |
| Massapequa Park | 13 | 16,981 | 17,053 | -0.09% | 7,747 | 2 | Village |
| Floral Park | 14 | 16,079 | 16,121 | -0.16% | 11,315 | 1 | Village |
| Westbury | 15 | 16,012 | 15,808 | 0.19% | 6,831 | 2 | Village |
| Woodbury | 16 | 12,153 | 12,191 | -0.54% | 337 | 36 | Town |
| Woodbury | 17 | 11,596 | 11,528 | 0.22% | 326 | 36 | Village |
| Great Neck | 18 | 11,144 | 11,121 | 0.03% | 8,417 | 1 | Village |
| New Hyde Park | 19 | 10,222 | 10,251 | -0.04% | 12,054 | 1 | Village |
| East Rockaway | 20 | 10,099 | 10,094 | 0.03% | 9,920 | 1 | Village |
| Farmingdale | 21 | 8,616 | 8,451 | 0.37% | 7,876 | 1 | Village |
| Malverne | 22 | 8,463 | 8,534 | -0.15% | 7,999 | 1 | Village |
| Great Neck Plaza | 23 | 7,990 | 7,374 | 1.28% | 25,691 | 0 | Village |
| Williston Park | 24 | 7,515 | 7,566 | -0.12% | 12,005 | 1 | Village |
| East Hills | 25 | 7,347 | 7,240 | 0.26% | 3,224 | 2 | Village |
| Cedarhurst | 26 | 7,334 | 7,344 | 0% | 10,865 | 1 | Village |
| Manorhaven | 27 | 7,152 | 6,957 | 0.24% | 15,249 | 0 | Village |
| Lawrence | 28 | 6,857 | 6,793 | 0.15% | 1,844 | 4 | Village |
| Bayville | 29 | 6,779 | 6,768 | -0.01% | 4,659 | 1 | Village |
| Kings Point | 30 | 5,733 | 5,603 | 0.4% | 1,707 | 3 | Village |
| North Hills | 31 | 5,482 | 5,447 | 0.02% | 1,988 | 3 | Village |
| Old Westbury | 32 | 5,259 | 4,297 | 3.71% | 614 | 9 | Village |
| Island Park | 33 | 5,092 | 4,952 | 0.45% | 11,443 | 0 | Village |
| Sea Cliff | 34 | 5,025 | 5,054 | -0.12% | 4,507 | 1 | Village |
| Flower Hill | 35 | 4,879 | 4,778 | 0.39% | 3,027 | 2 | Village |
| Muttontown | 36 | 3,583 | 3,494 | 0.42% | 592 | 6 | Village |
| Great Neck Estates | 37 | 3,188 | 2,937 | 1.56% | 4,162 | 1 | Village |
| Port Washington North | 38 | 3,151 | 3,166 | -0.1% | 6,578 | 0 | Village |
| Roslyn | 39 | 3,057 | 2,898 | 1.06% | 4,740 | 1 | Village |
| Brookville | 40 | 3,054 | 2,963 | 0.56% | 774 | 4 | Village |
| Lake Success | 41 | 2,854 | 2,821 | 0.18% | 1,543 | 2 | Village |
| Munsey Park | 42 | 2,784 | 2,799 | -0.11% | 5,395 | 1 | Village |
| Sands Point | 43 | 2,776 | 2,709 | 0.43% | 658 | 4 | Village |
| Thomaston | 44 | 2,773 | 2,784 | -0.11% | 6,864 | 0 | Village |
| East Williston | 45 | 2,612 | 2,633 | -0.15% | 4,591 | 1 | Village |
| Oyster Bay Cove | 46 | 2,291 | 2,272 | 0.13% | 548 | 4 | Village |
| Old Brookville | 47 | 2,103 | 2,066 | 0.24% | 528 | 4 | Village |
| Laurel Hollow | 48 | 1,952 | 1,934 | 0.15% | 660 | 3 | Village |
| Stewart Manor | 49 | 1,921 | 1,939 | -0.21% | 9,510 | 0 | Village |
| Lattingtown | 50 | 1,878 | 1,892 | -0.16% | 501 | 4 | Village |
| South Floral Park | 51 | 1,779 | 1,732 | 0.34% | 18,340 | 0 | Village |
| Upper Brookville | 52 | 1,779 | 1,769 | 0.06% | 414 | 4 | Village |
| Lawrence | 53 | 1,748 | 1,727 | 0.11% | 37 | 48 | Town |
| Atlantic Beach | 54 | 1,726 | 1,707 | 0.17% | 3,932 | 0 | Village |
| Plandome | 55 | 1,493 | 1,433 | 0.74% | 3,035 | 0 | Village |
| Roslyn Estates | 56 | 1,339 | 1,308 | 0.45% | 3,064 | 0 | Village |
| Hewlett Harbor | 57 | 1,331 | 1,336 | -0.08% | 1,836 | 1 | Village |
| Kensington | 58 | 1,279 | 1,266 | 0.08% | 5,035 | 0 | Village |
| Roslyn Harbor | 59 | 1,123 | 1,073 | 0.9% | 943 | 1 | Village |
| Plandome Heights | 60 | 1,019 | 1,016 | 0% | 5,630 | 0 | Village |
| Saddle Rock | 61 | 1,014 | 984 | 0.6% | 4,008 | 0 | Village |
| Baxter Estates | 62 | 1,012 | 1,020 | -0.2% | 5,560 | 0 | Village |
| Mill Neck | 63 | 1,008 | 1,018 | -0.2% | 385 | 3 | Village |
| Russell Gardens | 64 | 898 | 905 | -0.22% | 5,161 | 0 | Village |
| Woodsburgh | 65 | 885 | 885 | 0% | 2,618 | 0 | Village |
| Matinecock | 66 | 853 | 856 | -0.12% | 320 | 3 | Village |
| Plandome Manor | 67 | 829 | 796 | 0.73% | 1,530 | 1 | Village |
| Baldwin | 68 | 766 | 812 | -1.16% | 30 | 26 | Town |
| Hewlett Neck | 69 | 578 | 548 | 0.7% | 2,964 | 0 | Village |
| Hewlett Bay Park | 70 | 481 | 468 | 0.21% | 1,423 | 0 | Village |
| Centre Island | 71 | 393 | 397 | -0.25% | 361 | 1 | Village |
| Cove Neck | 72 | 292 | 294 | -0.34% | 227 | 1 | Village |
Hempstead is the largest city in Nassau County, with a population of 796,269.
Cove Neck is the smallest city in Nassau County, with a population of 292.
There are 72 cities in Nassau County, New York.