The James Corwith gristmill sits on Halsey Lane in Water...

The James Corwith gristmill sits on Halsey Lane in Water Mill, which was one of the top five most expensive zip codes in the nation, according to PropertyShark. Credit: Tom Lambui

Eleven Long Island communities ranked among the top 100 most expensive ZIP codes to buy a home in the United States this year, and two of those communities cracked the top five, according to the latest annual ranking from PropertyShark.

Sagaponack ranked third, with a median home sale price of $5.9 million, and Water Mill ranked fifth, at $5.5 million based on sales that closed from January to September, Newsday reported. The data include sales of houses, condos and co-ops but exclude multi-parcel transactions.

Sagaponack’s ranking fell from No. 2 last year, while Water Mill dropped from No. 3.

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