Visit the following page to find all bitcoin ATM locations in the U.S.
Bitcoin ATMs are spreading quite fast since the end of 2015 and beginning of 2016. Although the most useful application of bitcoin machines could be in the developing countries where financial inclusion is low, the majority of bitcoin ATMs are still appearing in developed countries.
Quick look at bitcoin ATM aggregated stats shows that 63% of all bitcoin machines are in North America and 25% are in Europe. Taking into account 5% in Oceania (mostly Australia) means almost 95% of all machines are in developed countries. There are several reasons for this. Costs for bitcoin ATMs might be quite high for average businessmen in developing country with respect to risk of operating and running it. Also return on investment required can be achieved only in locations with relatively large user base and steady bitcoin usage (mostly in developed countries as of now), which results in transaction volume for such machines.
Leading country within the developed countries list with respect to bitcoin ATM adoption is the United States. As of the end of March 2016 it has roughly 280 bitcoin ATMs installed across the country, which comprises ~45% of all installations worldwide.