The state archives of Rheinland-Pflalz put a list of emigrants from Germany online. The list contains over 50,000 entries, more will be entered later. It contains names, home towns and destination country, sometimes destination city.
The description of the data base is here (in German):
The entries can be found in here, sorted alphabetically:
I have not found out how to search for entries in the list.
Andreas Schwab, Montreal, Canada