The bill looks thick, but the face is White Wagtail (ssp. ocularis/leucopsis type), and the body is White Wagtail — a puzzling individual.

At first glance a White Wagtail, but the apron-shaped black breast patch looks like a White-faced Wagtail.

Something feels off, but it's too much trouble, so: White-faced Wagtail. ^^;

Hmm. Same as above — another borderline individual. Going with White-faced Wagtail for now… ^^;

Ordinary White Wagtail, first-winter female.

This one is also a White Wagtail.

Various White Wagtail subspecies.