Early next month, Rosie’s Gaming is opening its latest slots parlor of sorts in the state, with a 150-machine facility in Dumfries, in southern Prince William County.

For all practical purposes, the machines play like slot machines, and casual gamblers would be hard-pressed to notice the difference between Rosie’s machines and any other slot machine. Technically, though, the outcome of the wager is tied to the results of old horse races, and the machines provide an option — rarely used — to make the wager based on information about the horses’ post-time odds and other factors.

The second Rosie’s Gaming Emporium to open was in Vinton, which will be similar size to the one in Dumfries.

“In every jurisdiction, the people that come out are looking for an entertainment option that’s clean, safe and friendly. And we provide that,” he said.

Dumfries Mayor Derrick Wood and other town officials toured the facility recently as machines arrived for installation and workers applied a final coat of paint to the exterior. Wood said he’s been impressed with the investment Rosie’s is making. More than 100 people are being hired with minimum wages of $15 an hour, and he said the company has committed to supporting community groups like Boys & Girls Clubs.

“Everybody ain’t gonna like you, everybody ain’t gonna like me, and everybody ain’t gonna like every business that comes to town,” he said.

But he thinks opponents, over time, may be won over as they see the improvements at the shopping center where Rosie’s is located and the company establishes itself in the community. The Rosie’s site represents the biggest job producer to come to the town in years, he said, and even by the most conservative estimates will increase town revenue by 20% at the outset.

Even more competition is coming for gamblers’ cash. Next month the Virginia Lottery will likely grant approval to a dozen or more commercial operators to launch online sports betting. Also, voters in four Virginia cities last month approved casinos that are expected to open in the next few years, and Richmond is planning a referendum in 2021.

Whether Northern Virginia would ever consider a full-scale expansion of casino gambling is unclear. A legislative study last year concluded that if Virginia wanted to generate significant tax revenue from its casinos, its best bet is to put a casino in Northern Virginia, where anticipated revenue would be $155 million, triple the estimate for any of the cities that approved casinos last month.

“From where I live, I can walk a few blocks and look out over the Potomac and see $150 million in Virginia money going across the bridge” to the MGM casino in Maryland, he said. “I’ve always said I’d be supportive of keeping Virginia’s money here in a responsible way.”