Centre is British English so that makes a bit more sense. From Wiki and the making of an empire!
History[edit]
The lands of the future Centre County were first recorded by James Potter in 1764. Potter, having reached the top of Nittany Mountain, and "....seeing the prairies and noble forest beneath him, cried out to his attendant, 'By heavens, Thompson, I have discovered an empire!'" [4] After the American Revolutionary War, Centre County was created on February 13, 1800, from parts of Huntingdon, Lycoming, Mifflin, and Northumberland counties; it was named for its central location in the state.