A few summers back during a trip East I decided to visit Lie-Nielsen Toolworks in Warren, Maine. As luck would have it, they were holding their annual open-house, so I was able to tour the factory where they make hand planes, chisels, saws, and other traditional woodworking tools.
Nearly everything Lie-Nielsen sells is made right there in Warren. Among the small number of items I know of that aren't made in-house are Starrett measuring tools (Massachusetts), Wetterlings Axes (Sweden), and Auriou rasps (France).
It would have been nice to tour the plant while it was in operation, but I understand why it was shut down for the open house—it would be dangerous to have guests wandering through while machines were running. The photos above are from my tour of the factory and include captions that describe what things are.
A personal side note: although I don't own any Lie-Nielsen tools, I have a longstanding "relationship" with the company. In the early 80s I was a boat building apprentice at the Maine Maritime Museum in Bath, which is 35 miles south of Warren. One afternoon a guy walked into the shop, introduced himself as Tom and showed us some tiny planes he'd made for a man who built ship models.
I was blown away by the beauty and quality of the tools he had made and would have loved to buy some from him. But like other apprentices, my budget was better suited to buying hand tools at flea markets and barn sales.
I remember thinking at the time that this Tom fellow (Thomas Lie-Nielsen) would never make a go of it because there could not possibly be enough people able to afford what he made. This is one of those cases where I am happy to have been wrong; in the 30+ years since Tom's visit to the boat shop his company has grown to around 100 employees and become a brand sold around the world.