Swahili question

Just a quick question for a Swahili speaker. Do you use -po or -mo when you want to say something/one is located in a town/city?
i.e. Is it : Bw. Smith yupo Dodoma.
        or : Bw. Smith yumo Dodoma.
Thanks

>>3
I'm going to Tanzania in the summer and will be teaching a bit of english, and I'll take any opportunity to try a new language. It's definitely a interesting language, but there isn't a lot of material available unfortunately.