Southern United States. How about you Mikael?
I'm Pakistani, but I'm living in Toronto.
The reaction I got from my parents was a net positive. They started off dismissive—they thought I was going through a phase or something—and as a result of that offered very little resistance to me saying that I was an atheist. It stayed this way for some time, with only the occasional disagreement. Then my elder brother became an atheist too, and I, in passing, mentioned that I ate pork (thinking it wasn't too big a deal as I'd openly been an atheist for some time), and everything went to shit. My parents were in tears and in complete and utter disbelief. I started off understanding, making sure to engage with them calmly, however after a short period of time where I continued to tolerate their hurtful ( though not insulting) words and regressive attitude, my temper got the better of me and I ended up getting into a shouting match with my mum.
That was a couple years ago however, and my relationship with my parents, specifically my mum, is better than it's ever been. Since moving to Canada (my parents were in Dubai before and I was studying in Australia) my mum's come a long way and I actually think she's on the verge of becoming an atheist herself. Ultimately my parents are kind hearted, loving people and all they needed was some time.