ljb_nj
If the question is about "Harbor" vs "Harbour", then yes "Harbour" is incorrect. There was a mapper who apparently felt that UK spelling conventions should be used everywhere, for names (not just tags). She did a lot of local mapping and there are a lot of errors like this.

As for "Cove" being a separate street, I don't think it is - both parts are shown as Boulevard on the county maps, but someone should check on the ground.