Columbus Grove’s Civic League opened a Civic Center on South High Street in 1922. The center was used as a place for people to do things like rest and eat their lunches; it was also used as a social hall.
Putnam Airport, Inc. opened in 1946 after being approved by the State of Ohio. The airport leased 20 acres of land east of Ottawa and hired Emery Russell to teach people how to fly a plane.
In May 1935, preparations began to drill an oil well on the W.B. Gierhart farm in Blanchard Township. At one point or another, almost every Putnam County township had at least one oil well.