Their home office is on the Minnesota/South Dakota border, but they ship from various regional suppliers around the country. From their website:
Where in the world is Browns Valley, Minnesota?
This is probably one of the most frequently asked questions by our customers. Here's a little geography lesson for you: Browns Valley is 90 miles south of Fargo, ND, or 200 miles west of Minneapolis, MN. In fact, if you put North America on a dartboard and threw a "bulls-eye", you'd probably hit...Browns Valley! Specifically, Hansen Pole Buildings is located on the SD side of Lake Traverse. Yes, the office is really in the state of South Dakota. Like many other border towns, our mail comes from the nearest post office, which just happens to be six miles away in Minnesota. Most of the materials are shipped from regional suppliers all across North America, putting our home office in the perfect place..in the building.