Not to be confused with effectiveness and efficacy. For other uses, see efficiency (disambiguation). Efficiency is the (often measurable) ability to avoid wasting materials, energy, efforts, money, and time in doing something or in producing a desired result. In a more general sense, it is the ability to do things well, successfully, and without waste.
Marengo, Iowa. Marengo is a town in and the county seat of Iowa County, Iowa, United States. It has served as the county seat since August 1845, even though it was not incorporated until July 1859. The population was 2,528 in the 2010 census, a decline from 2,535 in 2000.
Wright County is located in north central Iowa and is bordered by the following counties: West - Humboldt Co., NW - Kossuth Co., North - Hancock Co., NE - Cerro Gordo Co., East - Franklin Co., SE  Hardin Co., and South  Hamilton Co. and SW  Webster Co. Town/Community Township Population.