Bertha is a city in Todd County, Minnesota, United States. The population was 497 at the 2010 census. By the time of the 2020 Decennial Cens…Bertha is a city in Todd County, Minnesota, United States. The population was 497 at the 2010 census. By the time of the 2020 Decennial Census the population had grown to 560 residents. Bertha was platted in 1891, and named for Bertha Ristau, an early settler and wife of John Ristau who established the town's first Post Office in his log cabin store in 1880. Bertha was incorporated in July of 1897.
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