Olmsted County Places - Oronoco Township
ORONOCO township, organized in 1858, was named for its village, founded in 1854, which Dr. Hector Galloway, one of its first settlers, named for the large Orinoco river (differently spelled) in South America, in allusion to the valuable water power of the Middle branch of Zumbro river at this village.
Source:
MINNESOTA GEOGRAPHIC NAMES Their Origin and Historic Significance
by Warren Upham, Archaeologist of the Society
Published by the Minnesota Historical Society
Saint Paul, 1920