[RouteArea("CapacityControl")] [RoutePrefix("Max4Sales")] [Authentication()] public class Max4SalesController : BaseController { public Max4SalesController(IHttpContextManager httpContextManager) : base(httpContextManager) { } [Route("")] public ActionResult Index() { ViewBag.departmentId = 0; ViewBag.categoryId = 0; ViewBag.itemId = 0; return View(); } [Route("Department/{departmentId}")] public ActionResult DepartmentById(int departmentId) { ViewBag.departmentId = departmentId; ViewBag.categoryId = 0; ViewBag.itemId = 0; return View("Index"); }The first route is what works correctly. The URL I see in the browser is "http://localhost:5525/CapacityControl/Max4Sales"