The Rails-to-Trails Conservancy has announced a planned route for a coast-to-coast bike and walking path from Washington, D.C. to Washington State.

"If you’re in a car, you’ve been able to motor across the United States since 1913. (Thanks, Lincoln Highway.) But on a bike, it’s been more of a challenge—there’s no single unified route made for cycles that spans the continent. That may soon change: On Wednesday, the Rails-to-Trails Conservancy gave the grand reveal for an entirely car-free way to get across the country—the Great American Rail-Trail—that would connect Washington, D.C., to Seattle. The path runs through 12 states: Maryland, Pennsylvania, West Virginia, Ohio, Indiana, Illinois, Iowa, Nebraska, Wyoming, Montana, Idaho, and Washington."

https://www.citylab.com/transportation/2019/05/great-american-rail-trail...

The route will follow train right-of-way routes across northern US. It will probably take a couple of decades to fill in the existing bike paths, but if you are considering a move in the future, you might want to check out resources along the proposed route.