https://en.wikipedia.org/wiki/Manufacturing#List_of_countries_by_manufacturing_output
Google AI tells me that Indiana has the largest concentration of manufacturing. Other states with higher populations have more manufacturing overall. This is no surprise, as factories are common in Indiana, and the state is known for its blue collar labor force.
My home of Columbus, Indiana, is essentially a factory town where Cummins Engine Company has its worldwide headquarters and is the main industry of Columbus.
The industrialist Iwrin Miller took pride in Columbus, and was behind efforts to make it a nice place to live. I loved growing up in Columbus, so much so that I always wanted to retire here.
