2 (primary). That would have been 3 though if I hadn't happened to know an unusual number of longstanding and senior teachers/head teachers/consultants in the borough, who unanimously anti-recommended the other nearby school I'd been contemplating!
Viewed the absolute nearest ("he will definitely get in here, so do I like it?" - I did), and the one with a lovely reputation for which we were on the edge of the catchment ("is this really as nice as other people say?" - it was).
Getting time off work to go and look around etc was a massive pain so I am glad not to have needed to look at more. I am glad to have viewed both though (he's going to the further away and nicer one).
Otoh, I've also just looked into childminders - had the numbers of three on personal recommendation, met the first, really liked her and so have put down a deposit with her without bothering to get in touch with the other two. Couldn't be bothered to shop around when I'd found a solution DS and I were both happy with.