US Manufacturers by North Dakota
After searching for bicycle manufacturers in North Dakota, there does not appear to be any major professional large-scale bicycle brands manufacturing complete bikes or frames within the state itself. The limited population and demand in North Dakota likely discourages major bicycle production facilities.
However, there could be some small, custom bike builders or specialty shops constructing bespoke bikes on a limited basis within North Dakota that I could not locate in my initial research. But no sizable or well-known bike manufacturers seem to call the state home at the moment.