I have to "third" what the others have said. The problem is not Osmand--the problem is that the OpenStreetMap database doesn't have the information. OpenStreetMap is not owned or maintained by the Osmand developers, it is an independent organization that is operated by volunteers. House numbers are missing for almost every city in the U.S., except where people have had time to add them.
You would have the same problem is you tried to use MapFactorNavigator, Cruiser, or any other navigation program that used the OpenStreetMap database. The house numbers are simply not in OpenStreetMap, so Osmand, MapFactorNavigator, and the others _can't_ navigate you to them.
If there are some specific addresses that you are interested in, I might be able to help you get them added to OpenStreetMap (a very short list, I have other things in life to do!), and you would then see them show up in a new Osmand map update a couple or three weeks later, depending on timing.
Even better would be if you tried to add some of them yourself, but I certainly understand if you don't have time time or computer knowledge to do so. (There are OpenStreetMap volunteers who try to help new people, and it really isn't very difficult. I'm not trying to say that you have to add address information for entire cities. If you were to just add a dozen or two places that interest YOU, then you'll have made the map better for everyone.)
--jack