There is provided a sidewall closeout area assembly for an aircraft. The assembly includes a raceway with a first end to attach to a sidewall assembly, a second end to attach to aircraft floor structure(s), and a raceway body with first access opening(s) providing access to one or more of, a crown area and an underfloor area, for conductive elements routed along the raceway. The assembly further includes a raceway cover removably coupled to the raceway and having second access opening(s) providing access to the cabin and to an overfloor area in the cabin for the conductive elements. The assembly further includes a closeout area formed between the raceway body and the raceway cover, to house and protect the conductive elements. The assembly facilitates accessibility to the conductive elements, and provides a routing path for the conductive elements that does not need to be reconfigured for different aircraft cabin layouts.