Missouri Secondary State Route F is a short north-south highway in Southeastern Linn County. It runs from U.S. Rt. 36/Missouri State Route 5 to Missouri State Route 11, all near Saint Catharine. MO Sec St Rt F passes through the following town in Linn County. Saint Catharine MO Sec St Rt F is not multi-plexed in Linn County. MO Sec St Rt F intersects the following highways in Linn County. U.S. Rt. 36, near Saint Catharine. Missouri State Route 5, near Saint Catharine.