RE Maps 1820 Columbia Co Don't know about online, but 12 Original Twp. (1813) are Bloom, Briar Creek, Catawissa, Fishing Creek, Greenwood, Hemlock, Mifflin, Sugarloaf, also Chillasquaque, Derry, Mahoning, Turbot, The last four became Montour Co in 1850. You might find a map at Columbia Co.Historical & Genealogy Society 's web site... http://www.colcohist-gensoc.org lkp at Danville,PA