At its formation in 1994, the Allegheny Plateau Division consisted of seven counties; Venango, Clarion, Forest, Elk, Jefferson, Clearfield, and Cameron, all in Pennsylvania. In August of 2005, the division incorporated as a Pennsylvania non-profit, non-stock corporation. In 2008, Clinton County was transferred from Division 11 of the Mid-Eastern Region. In September of 2015, the Allegheny Highlands Division of the Niagara Frontier Region was dissolved. Five counties were transferred to the Allegheny Plateau Division. Then, in May of 2017, those counties were transferred again, this time to Division 5 of the Mid Central Region. That returned this division to its pre-2015 post-2008 size and shape.

The Allegheny Plateau Division holds 12 meetings each year, usually on the third Sunday of the month (except in June, to avoid Fathers Day), often at the home of a member. The usual meeting includes an operating session or other activity, a Bring and Brag contest, and a business meeting. The meetings in summer months are often held in conjunction with special events, a pattern which is likely to continue in future years. Persons who are not members are welcome to participate as guests, although that welcome does not extend to holding elected office or voting on business matters. December is reserved for the division awards banquet. In recent years it has been held on a Saturday early in December. The date of the banquet depends strongly on the availability of a hall. In 2015 through 2018, rather than a banquet, the division held an awards breakfast due to the division's participation in Brookville's Victorian Christmas celebration.

The Allegheny Plateau Division publishes a monthly newsletter, the Keystone Corridor. A printed copy is available by subscription, see Keystone Corridor page for rates. At one time, the division had considered exclusive electronic distribution of the newsletter. That is still being considered, due to the ever-increasing cost of preparing a printed edition. No decision has been reached, but the issue is a live one. Until it is decided, subscribers may ask to receive their copy electronically as a pdf file by e-mail. See the newsletter page for more detail.