I discovered something interesting tonight! An alternate way to search is to enter the city in the birthplace field and leave every other field in the search box EMPTY. I searched for Urmia using this link:
http://search.ancestry.com/cgi-bin/sse.dll?gl=ROOT_CATEGORY&... and came up with almost 1200 matches in public records!!

If the link does not work, just go to Search at the top of your screen and do as I did. See what you get. Also you should try different spellings like Ourmiah, Urumia, Urumiah as I have seen it these ways in Immigration records. Good luck!