Recompiled by R. S. Winder (1997) from lists appearing in: Brown, Runk & Co., 1888, History of Mercer Co., Pa.  Vol. I: pp. 147-153.

Note:  For 1800, although Irwin Twp. was in Venango Co., county lines were apparently indistinct.  The list hopefully includes the part of Irwin Twp. that later appeared to be in Mercer Co.

The list may also exclude that part of N. Beaver Twp. which would have been in Beaver Co. For more details on this, see Brown & Runk, Vol. 1, p. 140.