The neon glow that once welcomed millions of Californians speeding toward Las Vegas is about to go dark forever.

Primm Valley Resorts — the last full-time casino still operating in Primm, Nevada, the tiny gambling outpost formerly known as State Line along Interstate 15 — is permanently shutting down, marking the end of an era for the once-thriving desert pit stop just across California’s border.

Employees were informed this week that operations at Primm Valley Resort, Buffalo Bill’s, Whiskey Pete’s, the Primm Center and the Flying J truck stop will all close permanently, according to a termination notice dated May 5 that circulated online .

Primm, Nevada — formerly known as State Line — welcomed millions of Californians on their way to Las Vegas for decades.…