I like maps, I found these from Feb, 2026 by EWG (Environmental Working Group):

In the USA before California’s ban:

Nations that have banned paraquat in white:

Note for Canada:

In Canada, Syngenta was the only paraquat manufacturer with a registered product. Syngenta discontinued registering its product in Canada in 2023 following updated risk-mitigation efforts. Although there is not an outright ban, no paraquat products are sold in Canada.