Duluth vs Saint Louis County

Duluth

name

  • A city, the county seat of St. Louis County, Minnesota, United States. 

  • A suburb of Atlanta, Georgia, United States. 

Saint Louis County

name

  • One of 87 counties in Minnesota, United States. County seat: Duluth. 

  • A county of Missouri, United States. County seat: Clayton. 

  • Synonym of Lake County, Minnesota, USA, in its former dimensions. 

How often have the words Duluth and Saint Louis County occurred in a corpus of books? (source: Google Ngram Viewer )