Circle vs District

Circle

name
  • the Circle line of the London Underground, originally the Inner Circle. 

  • A town, the county seat of McCone County, Montana, United States. Named after a cattle brand in the form of a circle. 

  • A census-designated place in Yukon-Koyukuk Census Area, Alaska, United States. Erroneously thought to be on the Arctic Circle, which is 50 miles further north. 

  • A surname from German. 

District

name
  • The District Line of the London Underground, originally known as the District Railway. 

  • The District of Columbia, the federal district of the United States. 

  • Any of numerous governmental districts. 

How often have the words Circle and District occurred in a corpus of books? (source: Google Ngram Viewer )