This is a list of companies and brands that own their own factories and manufacture their own products in the USA. The do not contract with factories like ours. If you think someone important is missing from this list add it to the comments. Always buy from the manufacturer, it makes a difference. You'll typically get the best prices, the customer service will be knowledgeable on construction, materials, and sizing, and if something goes wrong they'll know how to fix it.
Rancourt & Co. Shoecrafters
Genesco / Parent company of Johnston & Murphy
http://www.johnstonmurphy.com/group.aspx?name=men/usa (beware: most shoes not manufactured in USA)
Chippewa / Justin Boots
New Balance (beware: very few styles actually produced in the USA)
Weinbrenner / Thorogood