Pemberton is a city in Blue Earth County, Minnesota, United States. The population was 229 at the 2020 census. It is part of the Mankato-Nort…Pemberton is a city in Blue Earth County, Minnesota, United States. The population was 229 at the 2020 census. It is part of the Mankato-North Mankato Metropolitan Statistical Area. The area of Pemberton had businesses as early as 1894. While many of these building burned prior to the Alphabet Railroad coming through, land was platted in 1907 for the town with the plans for a depot. The town is named for one of the railroad officials.