Pedro, Pennington Co., SD - 1909 Business Directory This file contains a listing from the "South Dakota State Business Directory", published in 1909 by the Gazetteer Publishing Co., Denver, CO. This information was transcribed by Deb Hochhalter and may be used for personal, non-profit use only. All other rights reserved. Deb Hochhalter 1997 Pedro Post office in Pennington County, 36 miles north of Wall, the most convenient railroad point. Population 16. Last Name First Name Business Hawks Elmer Genl. Mdse, hotel, livery and postmaster Pedro Bugle (w) E.L. Senn, publisher Senn E. L. publisher, Pedro Bugle