You could try BeerMapping or get the list off BeerAdvocate or RateBeer and pump into a Google Map. Things are happening so fast it is difficult to keep up unless a site had input and the rating sites have more immediate input than anywhere else.
Take NC for instance, we certainly have over 141 permitted breweries, but if you include the temporary permits we are at 180+. Most sites list us at 120 give or take. I update the Southern Brew News map info for NC, but even there we don't list multiple locations in the same city and often we are several months behind on map updates.