I was able to pretty easily find a whole article inside of about 30 seconds done by Pew Research, showing regional clustering and distribution, and they moreover describe the methodology and data sources used.

So while I get what you’re saying and why you’re asking, I’d encourage you to just spend a minute on a few web searches, instead of trying to treat the lemmy user base as a ChatGPT instance. And that last bit is why I’m not just handing you the link, or the answer.