Here's a cool interactive map that lets you see where candidates are raising the most money:
Where do the 2020 Democrats raise the most money?
Since it breaks down as far as zip code, I can see that my fiancee and I account for a fourth of Warren's contributions for ours in OH. I was also surprised to see how long Sanders' money is in Orange County. Wasn't really the vibe I got from my stint out there, although I wouldn't say the areas I was in are representative of the entire county -- especially one that large.