Oregon also had this as of Oct 1st, 2017.

[0] - http://www.oregon.gov/boli/TA/Pages/Equal%20Pay%20Law.aspx

"Effective October 6, 2017 employers are prohibited from seeking the pay history of an applicant or employee from the applicant or employee or a current or former employer of the applicant or employee before the employer makes an offer of employment to the prospective employee that includes an amount of compensation;"