Pfeiffer is an unincorporated community in Hardin County, in the U.S. state of Ohio. [1]
Pfeiffer had its start in 1883 when the railroad was extended to that point. [2] John Pfeiffer, an early postmaster, gave the community his last name. [2] A post office was established at Pfeiffer in 1883, and remained in operation until 1906. [3]