In many parts of the United States, sheriffs and their deputies are responsible for patrolling and enforcing laws in the unincorporated areas within their _[blank]_ jurisdiction.

county's

Explanation:

A sheriff is a county government official who exercises various functions in the county. In United States and other countries, people vote to elect their sheriffs.

A sheriff can deputize an individual at will in order to help the department's duties as well as  citizen's needs.

They are responsible for the enforcement of laws  in their respected counties.

answer; basic psychology;