There are just over 800 flags in the collection, making it one of the largest flag collections in the country. It includes the Statehouse Battle Flag collection of 553 national and regimental colors, state flags, foreign flags, military signal flags, commemorative flags, and service flags. The earliest flags in the collection are from the Mexican War era, 1846-1848. The most recent flags in the collection are from the Iraq War.
The pride of the collection is the very first Ohio flag
. The Ohio legislature adopted its distinctive design on May 9, 1902.