The bad news just keeps piling up for Republicans running in deep-blue New York state.

New figures released Thursday show that Democrats added 158,000 new voters over the last half-year, while the GOP managed to eke out a gain of just 1,435.

All told, there are now nearly 5.8 million registered Democrats in New York, compared with just 2.6 million Republicans, the state Board of Elections data show.

The year-to-year comparison is even worse for the GOP, which had nearly 41,000 fewer registered voters in November 2018 than it did in November 2017.

“It’s consequential,” said Steve Greenberg, the longtime pollster at Siena College. “The Republican enrollment dropped half a percentage point.”

A generation ago — when Republicans regularly won statewide races — Democrats maintained a 3-to-2 advantage over the GOP. “Now it’s better than 2-to-1,” Greenberg said.

There are now almost as many unaffiliated voters in New York — about 2.5 million — as there are registered Republicans.

“It’s getting harder and harder for Republicans to get elected statewide,” said former US Sen. Al D’Amato, the last New York Republican to win the seat. “It’s a very difficult, uphill climb.”

Polling shows Democrats with commanding leads in all statewide races — with two-term Gov. Cuomo leading Dutchess County Executive Marc Molinaro by 23 percentage points, 58 percent to 35 percent, in the most recent Quinnipiac University survey.

The latest voter rolls are loaded with good news for Democrats running in competitive congressional districts in New York City, Long Island and upstate.

Democrats gained 6,142 new active voters since April in the Hudson Valley’s hyper-competitive 19th District, where Democrat Antonio Delgado is challenging GOP incumbent John Faso. Republicans added a miserly 301.

Delgado has raised $7.8 million and spent more than $7 million — outpacing Faso by a nearly 2-to-1 margin. A Monmouth University poll gives Delgado the edge, 49 percent to 44 percent.

“The faster pace of new Democratic registration is a positive indicator of Democrats’ enthusiasm and perhaps of the success of local and statewide registration campaigns,” said Professor David Birdsell, dean of Baruch College-CUNY’s Marxe School of Public and International Affairs. “It’s important to remember, however, that registering isn’t voting.”

Democrats also significantly outpaced Republican registration gains in the 11th Congressional District, which covers Staten Island and a slice of southern Brooklyn, registering 6,051 voters compared to the GOP’s 2,073.

In that race, Democrat Max Rose outraised and outspent incumbent GOP Rep. Dan Donovan 2-to-1, according to the most recent campaign-finance filings.

The pattern holds in two potentially competitive elections on Long Island, where Reps. Lee Zeldin and Peter King are facing spirited challengers. Democrats gained 2,444 new registered voters in Zeldin’s 1st District and the GOP lost 2,098.

A similar dynamic played out in King’s 2nd District, where Democrats gained 175 new voters but the Republicans lost 2,632.

“It shows the Democratic vote is juiced up for this election,” said George Arzt, a longtime political strategist.

“[President] Trump motivates the Democratic base to come out and they will be coming out in droves. If I was Donovan or Zeldin or Peter King, I’d be worried.”