The state has the power to combine counties or to split counties. The state has the power to incorporate and to disincorporate cities, towns, and villages. To take away this power would require a change to the state constitution.

Back in the day,some states had their state senate elected by county or had a requirement that each county was entitled to at least one state senator. This caused the rural counties to be overly powerful at the state level. The US Supreme Court rejected this and state legislatures must be apportioned on a one man one vote basis regardless of political boundaries within the state. The USSC ruled that while states were sovereign in the makeup of the US House and Senate, the political subdivisions of a state had no such sovereignty and their boundaries could be readily crossed and ignored in setting legislative districts.