Welcome to the Ralls County Sheriff’s Office’s website. Ralls County covers an area of 481 square miles in northeast Missouri along the Mississippi River. Ralls County is comprised of several municipalities including the County Seat of New London as well as Center, Perry, and parts of Hannibal and Monroe City. Along with patrolling these areas, our office is also the primary law enforcement agency for the unincorporated areas of Rensselaer, Saverton, Madisonville, Hassard, Huntington, Spalding, Liberty Township, and Mark Twain Lake.