Updated the found locations through the 8th of February.
Props to nomadwillie for locating 21 new locations in October of 2009. There was one strip that was waymarked in this set that wasn't listed on the lists that I have found.
DougK added another 12 so far this month. His submissions are always impressive. Doug purposefully approach each waymark and captures the location as it is depicted in the Zippy the Pinhead strip. He also goes above and beyond with local information about the spot if it is available.
DougK also clarified a strip that had a panel location that was unrecognized in the strips location list. Impressive waymarking.
Additional waymarks were added in:
Michigan by Rattrak
Virginia by La de Boheme
and a pair in Indiana by vhasler
Thanks to all.