performing or functioning in the best possible manner with the least waste of time and effort; having and using requisite knowledge, skill, and industry; competent; capable: a reliable, efficient assistant.
Marengo is a village in Morrow County, Ohio, United States. The population was 342 at the 2010 census. Marengo is south of Mount Gilead, the county seat.
Marengo, Iowa. Homefacts City Report. Marengo is located in Iowa County, IA. The population is 2,841, making Marengo the 2nd largest city in Iowa County. There are 2 public schools in Marengo with an average Homefacts rating of B. The total crime rate for Marengo is very low, and there are 9 registered sex offenders residing in the city.