If you want to filter centralized exchanges by nations, use this one.
https://github.com/ccxt/ccxt/wiki/Exchange-Markets-By-CountryIt probably does not include all centralized exchanges because the list is short. If you know other websites that can help filtering CEX by country, please share it with me and community.
I thought it was gonna be a filter for supported countries lol. But if it's just for filtering where they are incorporated, you don't have to look elsewhere because it's on coingecko and they have loads of exchanges listed as you may have know.