Statistics for occurrence #1 of “Middlesex County” in chapter 44 of Lucius R. Paige, History of Cambridge, Massachusetts, 1630-1877, with a genealogical register:

... Middlesex County
Talcott, John (otherwise written Talcot, Tallcott, Tailcott, Taylcot, and Taylcott), was one of the earliest inhabitants, an...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Middlesex County (Massachusetts, United States) 213 48 1 0 0 user votes
Middlesex County (Virginia, United States) 131 2 3 0 0 user votes
Middlesex County (Connecticut, United States) 0 0 0 0 0 user votes
Middlesex County (New Jersey, United States) 0 0 0 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.