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

do swahili speakers even come here? and why are you learning it OP?
I think I'd like to learn it down the road