While it looks like most of them lived in the Brown Lands and met an undesirable fate there, there are several hints that there might be some near the Shire. Aside from Treebeard's statement that the Shire sounds like a place entwives would enjoy, a hobbit in the very beginning talks about a moving tree (wish I had the books to quote) and of course there is the Old Forest which, although more Entish itself, suggests that maybe there were entwives nearby- just as the Brown Lands were near enough to Fangorn, there may have been some other entwife colony near to the Old Forest.