When they are under the filled maps (which seems to be the default) they get lost under the filled map colors. I know I could just adjust the tranparancy of the filled map colors, but you have to decrease the tranparancy to almost 0% for the map options to show through....don't want to do that.
Christine, you're not alone! Most of us who work with Tableau maps feel exactly as you do (unfortunately). Urban Mapping (and Tableau) is ultimately responsible for this issue. Urban Mapping wants to sell you extra services, (if you're interested go here) and add extra features -- before they actually fix problems like the one you're pointing out.
Tracy was trying to link to this specific idea I posted a while back. But of course we first need a map provider who is actually willing to listen, before these issues will get resolved. Sad to say, but true.