It turns out the house doesn’t always win — at least not when it comes to Atlantic City’s troubled casino industry.

The city’s 12 casinos saw gambling revenues drop a whopping 12.6 percent in June, to $240.2 million, down from $274.7 million in the year-earlier month, according to the state Division of Gaming Enforcement.

For the first six months, casinos revenue fell 10.7 percent to $1.38 billion.

The declines are bad news for New Jersey Gov. Chris Christie, as well as hedge-fund heavy hitters including Carl Icahn and Marc Lasry, whose Avenue Capital is an investor in Trump Entertainment properties.

The Trump Plaza Hotel and Casino had the biggest drop for the month, falling 23.6 percent to $6.9 million. Icahn’s Tropicana Casino and Resorts was down 5.5 percent to $21 million.

The Revel Casino-Hotel, which emerged from bankruptcy in May — little more than a year after it opened — saw revenues drop 22.6 percent to $11.5 million.