In 1855, with the westward expansion, a post office called London was established and served until 1876. Agriculture was the main source of income until 1930, when oil was discovered nearby. New London was chosen when another post office was established in 1931, since there was a post office already named London. A tragic school explosion in 1937 killed almost 300 children and teachers. A cenotaph of Texas granite was erected in front of the new school in 1939.