US Manufacturers by Oklahoma
After searching for bicycle manufacturers in Oklahoma, there does not appear to be any major professional large-scale bicycle brands manufacturing complete bikes or frames within the state itself. The cycling industry and infrastructure is still developing in Oklahoma.
However, there could be some small, custom bike builders or specialty shops constructing bespoke bikes on a limited basis within Oklahoma that I could not locate in my initial research. But no sizable or well-known bike manufacturers seem to call the state home currently.