Lanesboro is a city in Carroll County, Iowa, United States. The population was 119 at the time of the 2020 census. Lanesboro got its start in th…Lanesboro is a city in Carroll County, Iowa, United States. The population was 119 at the time of the 2020 census. Lanesboro got its start in the year 1901, following construction of the Mason City and Fort Dodge Railroad through that territory. It was named for Julius Lane, an early settler.