The St. Louis area has experienced minor earthquake damage at least 12 times in the past 205 years. The St. Louis metropolitan area, with a population of about 2.8 million, faces earthquake hazard from large earthquakes in the New Madrid and Wabash Valley seismic zones, as well as a closer region of diffuse historical and prehistoric seismicity to its south and east. Also, low attenuation of seismic energy in the region and a substantial number of historic older unreinforced brick and stone buildings make the St. Louis area vulnerable to moderate earthquakes at relatively large distances compared to the western United States. This geotechnical database was compiled by James Palmer and others at the Missouri Department of Natural Resources as the product of a U.S. Geological Survey (USGS) Earthquake Hazards Program external grant through the National Earthquake Hazards Reduction Program (NEHRP) supporting urban seismic hazards mapping efforts for the St Louis metropolitan area (https://earthquake.usgs.gov/cfusion/external_grants/reports/05HQGR0019.pdf). The data in Tables.zip have been exported from the original Microsoft Access database and have been reviewed for completeness. See Appendix A in the aforementioned report for additional details. For archival purposes, the Microsoft Access database is also provided here, but the queries within have not been reviewed and the user assumes all responsibility.