| Index | Water Mill | New York | National |
| Cost of living index | 312 | 119 | 100 |
| Index | Water Mill | New York | National |
| Goods & Services index | 121 | 109 | 100 |
| Groceries index | 104 | 108 | 100 |
| Health care index | 114 | 99 | 100 |
| Housing index | 778 | 145 | 100 |
| Transportation index | 107 | 108 | 100 |
| Utilities index | 102 | 102 | 100 |
| Cost of living index | |
| Goods & Services index | |
| Groceries index | |
| Health care index | |
| Housing index | |
| Transportation index | |
| Utilities index |
| Median Income | Per Year | Per Month | Max Budget (28% DTI) | Max Budget (36% DTI) |
| Owners | $129,265 | $10,772 | $3,016 | $3,878 |
| Renters | $0 | $0 | $0 | $0 |
| State | General Sales Tax | With Max Surtax |
| New York | 4% | 8.875% |
| State | Income Tax (Low) | Income Tax (High) |
| New York | 4% | 8.82% |
| Item | Water Mill | National avg. | Difference |
| Haircut | $19.99 | $16.09 | 24.3% |
| Beauty Salon | $55.01 | $37.33 | 47.4% |
| Toothpaste | $1.98 | $2.45 | 19.3% |
| Shampoo | $0.91 | $1.00 | 9.2% |
| Movie | $11.97 | $10.28 | 16.4% |
| Bowling | $7.26 | $4.93 | 47.2% |
| Item | Water Mill | National avg. | Difference |
| Ground Beef | $3.85 | $3.80 | 1.1% |
| Fried Chicken | $1.55 | $1.40 | 10.8% |
| Milk | $2.07 | $2.01 | 2.9% |
| Potatoes | $3.93 | $3.01 | 30.6% |
| Pizza | $10.96 | $9.89 | 10.8% |
| Beer | $9.96 | $8.90 | 12.0% |
| Item | Water Mill | National avg. | Difference |
| Optometrist | $119.32 | $102.16 | 16.8% |
| Doctor | $130.03 | $108.36 | 20.0% |
| Dentist | $114.44 | $92.53 | 23.7% |
| Ibuprofen | $8.30 | $9.28 | 10.5% |
| Lipitor | $422.42 | $425.82 | 0.8% |
| Item | Water Mill | National avg. | Difference |
| Home Price | $1,833,300.00 | $184,700.00 | 892.6% |
| Avg. Mortgage Payment | $1,420.90 | $1,202.44 | 18.2% |
| Apartment Rent | $2,640.00 | $949.00 | 178.2% |
| Item | Water Mill | National avg. | Difference |
| Gasoline | $2.38 | $2.24 | 6.2% |
| Tire Balancing | $49.88 | $46.29 | 7.7% |
| Item | Water Mill | National avg. | Difference |
| All Electricity | $197.95 | $165.96 | 19.3% |
| Phone | $23.90 | $28.68 | 16.7% |
| City, State | Population | Cost of Living Index | National Avg. |
| Dering Harbor, NY | 5 | 113 | 13% |
| Northville village, NY | 1,018 | 103 | 3% |
| Flanders, NY | 5,125 | 129 | 29% |
| Jamesport, NY | 1,040 | 135 | 35% |
| Aquebogue, NY | 1,885 | 138 | 38% |
| Water Mill, NY | 2,349 | 312 | 212% |
| City, State | Population | Cost of Living Index | National Avg. |
| Arnold Line, MS | 2,349 | 85 | -15% |
| Fairmont City, IL | 2,349 | 83 | -17% |
| Junction City, KY | 2,349 | 83 | -17% |
| Kent Acres, DE | 2,348 | 103 | 3% |
| Dunkirk, MD | 2,350 | 142 | 42% |
| Water Mill, NY | 2,349 | 312 | 212% |