ZIP Code 11721

In ZIP code 11721, near Stony Brook, homes carry a median value of $740,300, and the county-level effective property tax rate of 1.73% works out to roughly $12,800 in annual taxes on such a home. Households here earn a median of $197,179, with per-capita income at $109,501, so that tax bill absorbs a smaller share of earnings than it would in most places. Sales tax runs 8.75% on purchases. High values and high incomes move together in this ZIP, keeping property taxes weighty in dollars yet contained against what residents bring in.