The application process isn't as simple as it used to be. What is anymore? Years ago when my wife and I went down to the local CBP office with passports and boat docs it took all of 15 minutes to walk out of there with LBO numbers. Now it's my understanding that you must apply online, get an appointment for an interview and then get your number at some later date. I could be off a bit as I'm repeating the experience of a friend who recently waded through the process. You might start by looking here https://svrs.cbp.dhs.gov/
I didn't see any locations listed along the coast of Wyoming.
The system works great once you've got the number. I cross in and out of the BVI and PR