| Index | Water Mill | New York | National |
| Median home price | $3,016,126 | $503,498 | $326,622 |
| Median rent asked | $0 | $1,761 | $1,444 |
| 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 | 1,040 | $267,598 | 18% |
| Flanders, NY | 5,277 | $584,147 | 79% |
| Aquebogue, NY | 2,075 | $795,589 | 144% |
| Greenport, NY | 2,113 | $893,237 | 173% |
| Water Mill, NY | 1,911 | $3,016,126 | 823% |
| Population | Home Price | National Avg. | |
| Coupeville, WA | 1,911 | $651,032 | 99% |
| Deatsville, AL | 1,911 | $378,239 | 16% |
| Bridgton, ME | 1,911 | $309,716 | 5% |
| Seeley, CA | 1,911 | $297,397 | 9% |
| Westhampton Beach, NY | 1,911 | $1,436,980 | 340% |
| Water Mill, NY | 1,911 | $3,016,126 | 823% |