District vs Interior

District

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

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

  • Any of numerous governmental districts. 

Interior

name
  • A region of British Columbia, Canada. 

  • A town and village in South Dakota, United States. 

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