CHEYENNE, Wyo. (AP) — The state of Wyoming wants to ensure those who live and work in Yellowstone register their vehicles in the state.

The Wyoming Department of Transportation, at the request of Gov. Matt Mead and members of Wyoming's congressional delegation, is pushing to get more Yellowstone residents and workers to follow state law and purchase Wyoming registrations and driver's licenses.

State and federal officials say they don't know how many of the about 550 permanent and more than 3,000 seasonal employees working for the National Park Service and Yellowstone's concessionaire, Xanterra Parks & Resorts need to get Wyoming plates. But with an average vehicle registration costing a couple hundred dollars, the state could theoretically be losing out on hundreds of thousands of dollars in fees each year, the Powell Tribune reported .

Wyoming Department of Transportation Director Bill Panos says it's been a problem "for years and years and years."

"The U.S. government trucks are one thing, but the private vehicles that are up there all the time, and the Xanterra vehicles? I want to see Wyoming plates on those trucks," Panos told Park County commissioners in August. "And that will occur."

The Wyoming Department of Transportation, joined by the Park County Treasurer's Office, has spoken with Yellowstone and Xanterra officials about the issue this year.

"We actually did find that there were a number of people — not as many as people thought, but there were a number of people — that were permanent residents up there that didn't have Wyoming registrations and didn't have Wyoming driver's licenses," Panos said.

The Wyoming Department of Transportation plans to make a push to increase the number of registrations when temporary employees start arriving in the park next spring.

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Information from: Powell (Wyo.) Tribune, http://www.powelltribune.com