A funny thing is I think >50% of them end up in Port Roberts, WA. It's an exclave of the US and relies on transiting Canadian border security, which generally prohibits felons from entering Canada, for communication with the rest of the US. As a result, most of the potential hitters from the mob, who are convicted felons, are less likely to be able to pass through, and they're also less likely to be able to easily bring weapons (although it's not that hard -- it's more that you'll get a bit of protection against casual interaction.)
WITSEC as well as international intelligence ops are suffering badly from searchable Internet histories, as well as biometrics at borders.
It's a very small community so you'd stick out. Many retirees. Lots of dual citizens. The US/Canada border isn't really as secure as you think mostly because it's not possible to seal such a long border. A big city is probably an easier place to keep a low profile.
I don't think there's a big advantage compared to any other random place. As long as your new identity is solid you're probably safe. If someone wants to get you at any cost and they know where you are this probably won't stop them.
Anyways, it is a neat place and you can often see killer whales from the beach.
Wiki says "As of 2013, 8,500 witnesses and 9,900 family members have been protected by the U.S. Marshals Service since 1971." The population of Port Roberts is 1,314.
Point Roberts? "Point Roberts also has a small airport and a large marina for air and water access; these two facilities allow direct access to the rest of Washington state without the need to enter Canada." https://en.wikipedia.org/wiki/Point_Roberts,_Washington#Tran... I suppose it might be harder for hitmen to stay low-profile when entering by boat or plane instead of car, but I'd think it's not really going to stop them. It's neat to learn about the place, anyway.
WITSEC as well as international intelligence ops are suffering badly from searchable Internet histories, as well as biometrics at borders.