In 2008, researchers at the Library Research Service (LRS) undertook the "U.S. Public Libraries and the Use of Web Technologies" study, with the intent to document the use of various Internet technologies on the websites of public libraries throughout the nation (Lietzau, 2009). The results of that study set a baseline for the adoption of web technologies nationwide by studying a random sample of public library websites, stratified by legal service area (LSA) population group, and included a Colorado-specific section of all public libraries in Colorado. From its inception, U.S. Public Libraries and the Use of Web Technologies was conceived as a longitudinal study, with plans to revisit the sample libraries at regular intervals to track the changing nature of technologies on the websites of public libraries throughout the country and in Colorado. This report constitutes the results of the third iteration of the biennial study. In the vein of the first and second studies, the 2012 edition was conducted as a content analysis, as opposed to a survey to the field. During the fall and early winter of 2012-2013, LRS staff visited the websites of 689 public libraries in the United States, searching for the presence of various technologies. The national sample was comprised of 584 libraries, while the remaining 105 were Colorado public libraries that had not been selected as part of the national sample. The results included here represent a "snapshot in time" for each library. It is quite possible that a library adopted a specific technology shortly after LRS staff visited its website. In such a case, for this study it will still be treated as not using the technology in question. Also possible, though less likely, would be libraries which abandoned technologies shortly after staff visited their sites. A survey instrument is appended. [This report was produced by the Library Research Service (LRS), a unit of the Colorado State Library, Colorado Department of Education that partners with the Library and Information Science Program, Morgridge College of Education, University of Denver.]