I wouldn't be so sure. Does the employee visit California? Report to a California manager? Is the HR department calculating and applying some new, formulaic reg

I wouldn't be so sure. Does the employee visit California? Report to a California manager? Is the HR department calculating and applying some new, formulaic regional discount based in California? It's also possible California & Ohio would have a shared worker-protection outlook. Many states, and some cities – among them Toledo & Cincinnati in Ohio - have matched California's ban of asking for salary histories. As public policy, they want employees judged for their current competitive skills, not some other non-germane circumstances of their life which doesn't affect work product. Choice of residency could easily be treated the same. Even if California simply said, "you can't apply a salary-adjustment to residents of Fresno", it'd have a big effect. Ohio could then also add: "you can't pay Ohioans less simply because they live in Ohio".