Pretty sure Seattle (maybe King County) doesn't allow billboards. You can really tell when you pass the banned area when driving south on I-5 getting close to Tacoma.
Also if interested the opening scenes of The Monkey Wrench Gang (by Edward Abbey) are about illegally cutting down billboards in Southwest Utah.
Also if interested the opening scenes of The Monkey Wrench Gang (by Edward Abbey) are about illegally cutting down billboards in Southwest Utah.