Identifiers: CDP · village
| Rank | Community | Population |
|---|---|---|
| 1 | Brentwood (CDP), NY | 62,387 |
| 2 | West Babylon (CDP), NY | 43,213 |
| 3 | Coram (CDP), NY | 40,220 |
| 4 | Central Islip (CDP), NY | 36,714 |
| 5 | Commack (CDP), NY | 36,536 |
| 6 | Huntington Station (CDP), NY | 34,878 |
| 7 | Centereach (CDP), NY | 30,980 |
| 8 | Bay Shore (CDP), NY | 29,244 |
| 9 | Deer Park (CDP), NY | 28,837 |
| 10 | Lindenhurst (village), NY | 27,148 |
| 11 | Plainview (CDP), NY | 27,100 |
| 12 | West Islip (CDP), NY | 27,048 |
| 13 | Holbrook (CDP), NY | 26,487 |
| 14 | Shirley (CDP), NY | 26,360 |
| 15 | Dix Hills (CDP), NY | 26,180 |
| 16 | Smithtown (CDP), NY | 25,629 |
| 17 | Medford (CDP), NY | 24,247 |
| 18 | Copiague (CDP), NY | 23,429 |
| 19 | East Patchogue (CDP), NY | 21,580 |
| 20 | Massapequa (CDP), NY | 21,355 |