The canonical form for cities in the United States is [[City, State]] (the "comma convention"). It is required for those cities with names that require disambiguation. Cities which either have unique names or are unquestionably the most significant place sharing their name, can have undisambiguated titles (e.g., New York City, Philadelphia, Chicago). Cities that need additional disambiguation include their county or parish (for example Elgin, Lancaster County, South Carolina and Elgin, Kershaw County, South Carolina).