Statistics for occurrence #1 of “St. Louis County” in chapter 4.46 of Jefferson Davis, The Rise and Fall of the Confederate Government:

... with the laws of the State of Missouri, which have been existing for some years, and in obedience to the orders of the Governor, on Monday last I entered into an encampment with the militia force of St. Louis County for the purpose of instructing the same in accordance with the laws of the United States and of this State. He further sets forth that every officer and soldier of his command had taken an oath to...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
St. Louis county (Missouri, United States) 33 2 5 0 0 user votes
St. Louis county (Minnesota, United States) 1 0 1 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.