I just looked and I can't find any option to localize results more specifically than "United States." I'm not finding anything in a KB search either. If the option is there, it has really poor discoverability.
I love the service, but poor local results is definitely one of its weak points and basically the only reason I ever fall back to Google anymore.
Kagi does let you opt-in your location to improve searches. So there is a way and the user is in full control.