It's also important to consider number of stalls v.s. number of locations. The biggest Electrify America location on I-5 between SF and LA has 10 stalls. The biggest Tesla supercharger location has over 100.
The next largest are:
* Kettleman City (again technically two stations, this time across the street) with 95
* Tejon Ranch (again two stations about 1000 ft distant) with 80.
Quartzsite (sic) AZ with 36 is scheduled to have, in the future, 124 stalls when expansion is complete
Interestingly enough, the largest Supercharger in the Houston area only has 16 stalls.