It would seem that not all posts that were lost were returned. I had replied to Eldarion's comment about Annuminas. Sadly the post is gone it appears. In short I agree with Eldarion he brings up a good point.
Annuminas seems to have drifted out of use after the North Kingdom was split into three parts. It would appear the three brothers could not agree to who was rightful heir to the throne and so they split the north kingdom up and not one of them sat on the throne in Annuminas. With no agreed on heir it would appear the subjects of the north kingdom filtered out of Annuminas and ended up in in the other three kingdoms and Annuminas ......faded.
None of that is official it is simply my take on it. I am not sure if there was open conflict between the three parts of the North Kingdom. If anyone knows of a place this is mentioned please let me know.
A number of you are viewing or reading the Tolkien posts and that's great but no one seems to be interested in a particular direction for me to go in. So I will choose some elven history and do what I can with some of the bigger characters at play during LOTR.