Zell am See's population is less than 10,000 so there would be no need for more than one municipal graveyard.
Depends. In small towns with a local church, the cemeteries are often run by the local church itself. The bigger the town is, the more likely it is that the municipality runs it on their own. Other religious groups, such as Protestants or Muslims (or Jews in Vienna) often have their own cemeteries. But in small towns, if someone of Muslim faith dies - he/she is buried at the local cemetery as well (if that's his will, or that of his relatives). I have never heard of a case, in which the Catholic Church in some small town has rejected burying a resident of another faith really.
In my village of 2'000, the cemetery is run by the Church, and it's located around the church. However, the few Muslims in my village are as far as I know buried in the cemetery of the neighbouring town, where there is a mosque and a minaret, and a part of the local cemetery reserved for Muslims.
