Frankfort vs Lock Haven

Frankfort

name

  • A city, the county seat of Clinton County, Indiana, United States. 

  • The capital city of Kentucky, United States and the county seat of Franklin County. 

Lock Haven

name

  • A city, the county seat of Clinton County, Pennsylvania, United States. 

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