Rietheim birth, marriage, death records before 1742

[djc2002us]

Where would I find the records for my ancestors who lived in Rietheim prior to 1742? I am looking in particular for the Merz family. Thank you for your help.

 

[user722]

There are 3 Rietheim in Baden-Württemberg:

Rietheim 1) Amt Villingen, Dorf (Village) 
Rietheim, Villingen, Baden
Rietheim 2) Oberamt Tuttlingen,
 Dorf (Village) 
Rietheim, Schwarzwaldkreis, Württemberg
Rietheim 3) Oberamt Urach,
 Dorf (Village) 
Rietheim, Schwarzwaldkreis, Württemberg

Which one is yours?