@Mikle If your employer withheld income taxes for MD then yes there should be a MD sectiion of boxes 15-17.
Often when there are 2 states, employers will have 2 pages of w-2's as they only report 1 state on each. you would enter it as 1 w-2 with both states though . Check your paystub to see if MD taxes were withheld.
You would be a part year resident of both states for taxes. I would suggest completing the Fed return first, followed by the CA, and then the MD. You will get a credit for taxes paid to another state for income taxed by both states.
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