Too many. After a while, many are very similar and nothing special. Only a few are really "special" and worthwhile imo. Quantity over Quality if you ask me. In particular the south-west,Wow, nice work. How many locations are there total?
where radiation is everywhere and you can even go "beyond the map" there is basically nothing of worth, even tho that there are quite a few locations. The only cool location I have found turned out to be rather boring. I even found a friendly Children of Atom settlement, but I couldn't do anything there. =/
Tho, that east city is very clustered. Took me a whole day of playing to get through that.Wow. So how many locations in total?
I can really recommend that site:
http://fallout4map.com/
Used it to make sure that I don't miss a bobblehead. Just disable "pickups" to make it less clustered.