Mayfield is a city in Sumner County, Kansas, United States. As of the 2020 census, the population of the city was 75. The first post office in Mayf…Mayfield is a city in Sumner County, Kansas, United States. As of the 2020 census, the population of the city was 75. The first post office in Mayfield was established in 1880. According to the United States Census Bureau, the city has a total area of 0.11 square miles, all of it land.
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