After going through ‘Resolve All Place Names’ I still have quite a few that are unknown and I can’t match up without more info. I found ‘Jefferson’ all by its little ‘ole self. Is this Jefferson, Colorado? Or, could it be Jefferson, Oregon? Is it a city or a county?
Here is one method I use to help resolve these little mysteries. In the Places Workspace look at the Associated People on the left-hand side. Double-click one and it will take you to the People Workspace for that Person. It also takes you to the fact for the specific Place. This is a great feature. Now you can look at the other places that the person has been to see if any of them match up. Also look at spouses, parents, and children. Also look at the Source info. In my case the Source was Kentucky Death Index and so it was Jefferson County, Kentucky! Yay!
When you find a match to back to the Places Workspace and edit the place with the new info.
Hope that helps!