Jelloway, OhioJelloway is an unincorporated community in Brown Township, Knox County, Ohio, United States. Jelloway is located at the junction of Ohio State Route 3 and Ohio State Route 205, northeast of Mount Vernon.HistoryJelloway was originally called Brownsville, and under the latter name was laid out in 1840. The present name comes from nearby Jelloway Creek. A post office called Jelloway was established in 1842, and remained in operation until 1918.