Mewhirter was born in Sugar Grove, Illinois, USA, the son of Robert Mewhirter, and was educated in New Providence and at Drake University in Des Moines, Iowa.
He married Maria Blixt in 1856 and emigrated the same year to begin work at Sugar Grove, Pennsylvania and later at Jamestown, New York.
He worked as a chemist, and married Harriet Lord; in 1920 the couple was living with her mother in Sugar Grove, Warren County, Pennsylvania.
The Northern Illinois men's golf team currently play their home matches at Rich Harvest Farms in Sugar Grove, Illinois.
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The company's principal manufacturing facility is located in Montreal, Quebec, with additional facilities located in Ottawa, Ontario and Sugar Grove, Illinois.
Sugar Grove Station is an American government communications site located near Sugar Grove in Pendleton County, West Virginia operated by the National Security Agency (NSA).
After passing through Sugar Grove, the highway enters Bainbridge Township.
The Sugar Grove campus - the first and still today the main campus of the college, is 243 acres in size and is located north of Sugar Grove on Route 47.