The school/1000 ft requirement is a federal law so it's technically in effect anywhere in the US. I haven't heard of anyone enforcing this law as it is likely unconstitutional (in fact, a very similar law was ruled by SCOTUS as just that).
No permit is necessary for OC, but be advised that some police mistakenly apply the Clark County registration requirement upon visitors. Just remember, if approached by law enforcement, REFUSE TO ANSWER ANY QUESTIONS. A search of this forum will show a visitor from Pennsylvania had his firearm confiscated because it was not registered, even though the law clearly states the registration requirement is for residents only, or those in town greater than 60 days. The firearm was returned to him, but I imagine it was a PITA to have to deal with.