State tax filing

LenaH, I appreciate your input. I should clarify a couple of points. I was actually visiting my parents when our office closed down in March 2019. I elected to work from their home, since the internet reception in the room I was renting was very poor. I only returned to CA for a couple of days in July to move out of the room I was renting. If I file 2 state returns, I will use the July date as the basis for my date of residence change.  I never gave HR a change of address, so my W2 reflects that I was in CA for all of 2020. I have now given HR a new address. I still have CA plates on my car since I renewed them last June. I do plan to change them before renewal time in 2021. Whether I return to CA depends on my company. I plan to stay with them, but they do have other employees who were working remotely before the pandemic, so they hopefully will agree to let me continue working remotely.