[Looking for Plugin] – Information Lookup

I’ve been searching for a plugin to do the following:

I have list of polling locations and street names.
I want users to be able to either select their street name from a list or enter it manually and see what their polling location is.

I know I could probably hardcode this into a page myself but I was wondering if there were any good apps for creating custom lookups like that.

Thanks for any an all suggestion.