Download mapkit.js Find and replace: this.subLocality=t.subLocality, with this.subLocality=t.subLocality,this.subAdministrativeArea=t.subAdministrativeArea, There were two instances in my copy of version 5.75.4

The subAdministrativeArea is in the search payload. There just needs to be a tiny change to mapkit.js to add it to the Place object.