Samuel Clarke Pomeroy was a United States senator from Kansas in the mid-19th century. He served in the United States Senate during the American Civil War. Pomeroy also served in the Massachusetts House of Representatives. A Republican, he also was the mayor of Atchison, Kansas, from 1858 to 1859, the second president of the Atchison, Topeka and Santa Fe Railroad, and the first president to oversee any of the railroad's construction and operations. Pomeroy succeeded Cyrus K. Holliday as president of the railroad on January 13, 1864.

Atchison is a city and county seat of Atchison County, Kansas, United States, along the Missouri River. As of the 2020 census, the population of the city was 10,885. The city is named in honor of US Senator David Rice Atchison from Missouri and was the original eastern terminus of the Atchison, Topeka and Santa Fe Railway. Atchison is also the home of Benedictine College.