It can be hard, in today's technologically connected world, to get real-world addresses. Often there isn't a moment at which it occurs to us to say, "Oh, hey, what's your mailing address?"
And look at it this way--you got to serve as an example to the rest of us!
But also look at it another way: These people are grownups, and they could use the contact info you provided to contact you more privately.
And, these are people of goodwill who will all (hopefully) meet at your wedding. Accidentally having one another's e-mail & addresses, etc., is not the worst thing that could happen to them.