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https://en.wikipedia.org/wiki/Lieutenant_governor_(United_States%29
In the United States, 45 of the 50 states have an office of lieutenant governor. In two of the 45 states, the speaker of the upper house of the state legislature serves in such a capacity. In most cases, the lieutenant governor is the highest officer of state after the governor, standing in for that officer when they are absent from the state or temporarily incapacitated. In the event a governor dies, resigns or is removed from office, the lieutenant governor typically becomes governor.
States and territories which do not have a lieutenant governor
https://en.wikipedia.org/wiki/Lieutenant_governor_(United_States)#S...