City vs District

City

name
  • Any of several other cities in metropolitan areas (such as San Francisco). 

  • The United Kingdom's financial industries, which are principally based in the City of London. 

  • The borough of Manhattan, the historic core of New York. 

  • Manchester City Football Club, an English football club. 

  • The City of London, the historic core of London where the Roman settlement of Londinium was established. 

District

name
  • Any of numerous governmental districts. 

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

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

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