Pretty much the ENTIRE town
This is a small town with a 25 MPH limit just about everywhere. Even the main drag leading into and out of Benton City is 25, and they mean TWENTY FIVE. Drive 26 or more, and you have a 90% chance of getting stopped somewhere along the five or six mile stretch going through. There is a school zone at the north end, with a 20 MPH limit, so you’d better drop 5 MPH when you reach it. Note that for several miles PAST town going north, (out in the farmland past orchards etc.) the limit is still only 40 MPH.