The name "Castor" refers to the genus Castoridae or beaver, a Latin term, contrary to an oral tradition of the word being Native American in origin.

A number of surrounding smaller villages, both incorporated and not, including Roy, utilize the ZIP code of Castor.

[3] [4]The area supplied hundreds of young men as soldiers during the Civil War, including the Castor Guards and the Bienville Rifles.

Mrs. Bonnie Daniel and Mrs. Merlene Young lived the furthest away in Weatherford and Kerrville, Texas, respectively, but they too are buried at Ebenezer.

The Smith family sold most of its land to Jerry "Cotton" Guin, an employee of Libbey Glass in Shreveport, who raised bees there until 2009.

A new bank building, a two-story brick structure, opened with the upper floor reserved for the Masonic lodge.

This bank closed in 1933, but the top floor was still maintained by the lodge and the Order of the Eastern Star, which had been chartered in Castor on June 6, 1912.

[6] In the late evening of April 23, 2000, Castor was struck by a tornado with a half-mile-wide path of destruction, which caused massive damage.

There were no severe injuries, but the infrastructure damage caused the closure of most small businesses as well as the public school for a period of weeks.

Discovered in 2007-2008, the Haynesville Shale, one of the largest natural gas deposits in the United States, sits underneath northwest Louisiana, including Castor.

At ground level, Castor seems flat and surrounded by trees; however, in reality it sits in a valley which makes it a dead area for cell phone coverage.

In 2016, one BETA club member (Mateo Chavez) placed first and third at the state conference and advanced to the national competition.

One year later, another Castor High BETA member (Gabrielle Guin) placed second at the state conference in the Handmade Jewelry competition.

In 2018, at the Future Business Leaders of America State Conference, Mateo Chavez and Brittney Lea made school history.

Castor has several businesses: the General Store, a gasoline station, flower shop, a cafe, a beauty shop, a laundromat, a branch of the Bank of Montgomery (formerly Bank of Ringgold), United States Post Office, retirement homes, and a mobile home park.