Statistics for occurrence #1 of “Worcester County” in chapter 21 of Lucius R. Paige, History of Cambridge, Massachusetts, 1630-1877, with a genealogical register:

...joint instruction and superintendence of Eliot and Gookin, slow but encouraging progress was made in civilizing and Christianizing the Indians in Massachussetts, as far west as the westerly border of Worcester County ; and a similar good work was accomplished in the Colony of Plymouth. The two races maintained peaceful relations with each other until 1675, when that terrible contest commenced, which is generally...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Worcester County (Massachusetts, United States) 124 28 10 0 0 user votes
Worcester County (Maryland, United States) 12 0 4 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.