Some sources say it is a corruption of the French description of the clay (glaise) water (eau);[5] others say it comes from a Native American word for fallen timbers.

[7] Eau glaise ("clay water") remains unattested, like the attested terre glaise ("clay soil"), but Ramsey[8] and Stewart[9] agree that Auglaize (and variants, implying "*aux glaises") is American French for "at the lick(s)", literally "at the clays", where wild beasts came to lick salt and minerals from the soil, filling the lacuna in standard French for a salt lick.

The assumed indigenous American (Algonquian) "fallen timbers" or "overgrown with brush" has no support without any attested etymons supplied and would not match phonetically in the case of Shawnee.

The county is crossed by the Auglaize River and the Miami and Erie Canal.

23.30% of all households were made up of individuals, and 10.50% had someone living alone who was 65 years of age or older.

As of the 2010 United States Census, there were 45,949 people, 17,972 households, and 12,749 families residing in the county.

[22] Prior to 1920, Auglaize County consistently voted for Democratic candidates in presidential elections.

Occupying an entire city block, the courthouse and its adjacent powerhouse cost $259,481.

Built of Berea sandstone with tile floors, the courthouse was highly fire-resistant.

The boilers for heating and power generation, a significant cause of fire at the time, were in a separate powerhouse.

Steam-driven dynamos produced the electricity that, along with steam for heating and hot water, was fed to the building via an underground conduit.

[26] Employers with more than 400 employees are Crown Equipment Corporation, Joint Township District Memorial Hospital, the Minster Machine Company, Setex, Inc, AAP-St. Mary's Corporation (a division of Hitachi Metals), Veyance Technologies, Inc (Goodyear Tire and Rubber Company), and the Dannon Company.