The National Park Service says visitors spent $10 million at Harpers Ferry National Historical Park and nearby communities during 2010.
The report released Friday says the park had nearly 269,000 visitors, and their spending supported 141 jobs.
Most was on lodging, food and beverage services, followed by other retail, entertainment, gas and local transportation, and groceries.
Daniel Stynes of Michigan State University did the study.
Nationwide, he says national park visitors added about $31 billion to the U.S. economy and helped support more than 258,000 jobs.
Harpers Ferry Superintendent Rebecca Harriett says national parks have always been good for businesses in the surrounding communities, and she calls hers clean, green economic fuel.
The park sits on the Virginia-West Virginia border at the confluence of the Shenandoah and Potomac rivers.