| Index | Shelter Island | New York | National |
| Cost of living | 216 | 117 | 100 |
| Goods & Services | 108 | 108 | 100 |
| Groceries | 99 | 102 | 100 |
| Health care | 113 | 103 | 100 |
| Housing | 464 | 145 | 100 |
| Transportation | 103 | 105 | 100 |
| Utilities | 133 | 100 | 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 | $127,232 | $10,603 | $2,969 | $3,817 |
| 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% | 10.9% |
| Item | Shelter Island | National avg. | Difference |
| Haircut | $39.78 | $24.26 | 64.0% |
| Beauty Salon | $69.00 | $45.56 | 51.4% |
| Toothpaste | $3.86 | $3.70 | 4.2% |
| Shampoo | $1.47 | $1.28 | 14.8% |
| Movie | $15.07 | $12.13 | 24.2% |
| Bowling | $24.00 | $18.00 | 33.3% |
| Item | Shelter Island | National avg. | Difference |
| Ground Beef | $6.28 | $5.84 | 7.6% |
| Fried Chicken | $1.59 | $1.57 | 1.4% |
| Milk | $4.83 | $4.67 | 3.3% |
| Potatoes | $5.03 | $4.93 | 2.0% |
| Pizza | $13.21 | $12.09 | 9.3% |
| Beer | $10.53 | $10.41 | 1.1% |
| Item | Shelter Island | National avg. | Difference |
| Optometrist | $134.70 | $125.68 | 7.2% |
| Doctor | $162.26 | $135.78 | 19.5% |
| Dentist | $136.03 | $113.29 | 20.1% |
| Ibuprofen | $11.26 | $10.65 | 5.7% |
| Lipitor | $375.63 | $468.60 | 19.8% |
| Item | Shelter Island | National avg. | Difference |
| Home Price | $857,300.00 | $184,700.00 | 364.2% |
| Avg. Mortgage Payment | $3,730.18 | $2,346.69 | 59.0% |
| Apartment Rent | $0.00 | $949.00 | 100.0% |
| Item | Shelter Island | National avg. | Difference |
| Gasoline | $3.47 | $3.46 | 0.2% |
| Tire Balancing | $63.33 | $59.92 | 5.7% |
| Item | Shelter Island | National avg. | Difference |
| All Electricity | $296.64 | $193.99 | 52.9% |
| Phone | $185.16 | $192.25 | 3.7% |
| City | Population | Cost of Living Index | National Avg. |
| Fishers Island, NY | 61 | 109 | 9.5% |
| Dering Harbor, NY | 0 | 109 | 9.5% |
| Flanders, NY | 5,170 | 131 | 31.2% |
| Greenport, NY | 2,058 | 150 | 50.4% |
| Mattituck, NY | 4,898 | 151 | 50.9% |
| Shelter Island, NY | 1,980 | 216 | 115.9% |
| City | Population | Cost of Living Index | National Avg. |
| Tavernier, FL | 1,980 | 147 | 46.8% |
| Hollandale, MS | 1,980 | 79 | 20.7% |
| River Heights, UT | 1,980 | 107 | 6.9% |
| Ocean Park, WA | 1,980 | 110 | 10.5% |
| Cross Lake 19A, MB | 1,980 | n/a | |
| Shelter Island, NY | 1,980 | 216 | 115.9% |
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