Peabody is a city in Marion County, Kansas, United States. As of the 2020 census, the population of the city was 937. The city was named after F.H. Peabody of Boston, former vice-president of the Atchison, Topeka and Santa Fe Railway. Peabody is well known in the region for its Independence Day Celebration on July 4, and its historic 1880s downtown main street. It is located between Newton and Florence along U.S. Route 50 highway.