Missouri Secondary State Route Z is a north-south highway in Cole County, west of Jefferson City. It runs from Missouri State Route 179, south to old U.S. Rt. 50. MO Sec St Rt Z does not pass through any towns in Cole County. MO Sec St Rt Z is not multi-plexed in Cole County. MO Sec St Rt Z intersects the following highway in Cole County. Missouri State Route 179, near Marion.