Prior to the arrival of the dial telephone system to Delphos in 1966, there was a central telephone office where several operators manned the switchboard. There were several households on a party line. To deliver a community message, the operator would deliver one long ring. When the receivers on the party line had clicked down, the operator would deliver her message.

The telephone office was at one time housed at the Sand Ridge School House. Later the telephone office was moved to what is now the town hall.

Following are some of the telephone operators: