| Index | Water Mill | New York | National |
| Median home price | $1,669,400 | $286,300 | $184,700 |
| Median rent asked | $0 | $1,159 | $949 |
| Avg. people per household | 2.6 | 2.6 | 2.6 |
| Owner occupied households | 93.8% | 53.6% | 63.6% |
| Renter occupied households | 6.2% | 46.4% | 36.4% |
| Population | Home Price | National Avg. | |
| Dering Harbor, NY | 0 | $0 | 100% |
| Northville village, NY | 1,018 | $147,600 | 20% |
| Flanders, NY | 5,170 | $330,700 | 79% |
| Aquebogue, NY | 1,996 | $435,800 | 136% |
| Greenport, NY | 2,058 | $500,000 | 171% |
| Water Mill, NY | 1,860 | $1,669,400 | 804% |
| Population | Home Price | National Avg. | |
| Conesus Lake, NY | 1,860 | $229,200 | 24% |
| McMechen, WV | 1,861 | $71,400 | 61% |
| Port Henry, NY | 1,859 | $109,600 | 41% |
| Orwell, OH | 1,862 | $103,200 | 44% |
| Marriott-Slaterville, UT | 1,862 | $323,900 | 75% |
| Water Mill, NY | 1,860 | $1,669,400 | 804% |
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