Arnold is an unincorporated community in Jerome Township, Union County, Ohio, United States.

The station was originally called New California, but the name was changed when they applied for a post office.

Fred Smith was then commissioned as Postmaster, but closed his business also before he could perform any of the duties of the office.

Mrs. Carrie Fleck was the next Postmaster, when she and her husband established a store in the community later in 1896.

This Union County, Ohio state location article is a stub.