Just in time for Valentine’s Day, a cheating-heart Web site is telling New York where all the two-timers live.

Park Slope, Gramercy Park and Tribeca are the top Big Apple neighborhoods for cheaters, according to the adultery-promoting matchmakers at AshleyMadison.com.

The site claims it has 840,300 members in the five boroughs, Long Island and southern Westchester County.

Park Slope in Brooklyn has 10 percent of the local unfaithful, according to the Web site.

The Manhattan neighborhoods of Gramercy Park and Tribeca follow close behind, at 9.7 percent and 9.6 percent, respectively.

The next two most unfaithful local communities are Great Neck — AshleyMadison’s top Long Island community, with 8.8 percent of area membership — and Hell’s Kitchen in Manhattan, at 8.7 percent.

The Top 10 cheating nabes are rounded out by the Upper East Side, with 8 percent, Astoria, Queens, at 7.6 percent, the Nassau County village of Old Westbury at 7.1 percent, Brooklyn Heights, with 6.4 percent, and the Suffolk County hamlet of Dix Hills, with 6 percent.