Lane County, Oregon, is the place to be these days, if you want to come down with measles or some other disease; some schools in the Eugene area boast non-vaccination rates of as much as 72%!
Oregon requires vaccinations, including measles, to attend school. But students can avoid the requirement with a parental or doctor's note.
The state really needs to tighten things up a bit; it should take more than just a note from antivaxxer "parents" to be able to avoid vaccines. And their whole "the risks of getting vaccinated outweigh the benefits" is just plain jackassery. You want to talk about a badass vaccine, try the one for smallpox that I got when I was a kid - I've had a 1" diameter scar from that bad boy ever since. Of course, it helped eradicate smallpox, so there's that.
Fortunately, I also got measles when I was a kid, which means I have life-long immunity; it really fired up the ol' T-cells.