Some high level laws by state: https://www.legalmatch.com/law-library/article/political-aff...
The City of Seattle "assure[s] equal opportunity to all persons, free from restrictions because of race, color, sex, marital status, sexual orientation, gender identity, genetic information, political ideology, age, creed, religion, ancestry, national origin, honorably discharged veteran or military status or the presence of any sensory, mental or physical disability."
https://library.municode.com/wa/seattle/codes/municipal_code...