Introduction The SCEC Community Fault Model (CFM) is an object-oriented, three-dimensional representation of active faults in southern California and adjacent offshore basins that currently includes 440 individually named fault representations in the preferred model. Including alternative representations, the model incorporates 1186 objects. For the preferred fault set (440 surfaces), each fault object consists of triangulated surface representations (t-surfs) in several resolutions, fault traces in several different file formats, and complete metadata including references used to constrain the surfaces. The CFM faults are defined based on all available data including surface traces, seismicity, seismic reflection profiles, well data, geologic cross sections, and various other types of data and models. The CFM serves the Southern California Earthquake Center (SCEC) as a unified resource for physics-based fault systems modeling, strong ground-motion prediction, and probabilistic seismic hazards assessment (e.g., UCERF3). Together with the Community Velocity Model (CVM-H 15.1.0), the CFM comprises SCEC's Unified Structural Representation of the Southern California crust and upper mantle (Shaw et al., 2015). Current Model Version: CFM5.3 The latest release of the CFM is version 5.3, which includes many new and revised fault representations, notably in the Ridgecrest and offshore regions (Plesch et al. 2020). In addition, the new model has greatly expanded and improved the metadata component of CFM to help ensure the internal consistency and maintainability of the model. Automated scripts now check for consistency with filenames and the various metadata components. CFM fault objects follow a hierarchical naming system that enables model users to easily sort the model by region and subregions. The expanded metadata now includes fault surface areas, area-weighted average strike/dip values, expected sense of slip, and references for each fault object. Additionally, the expanded metatdata includes the equivalent USGS Quaternary fault (Qfault) ID, when available. See the README.txt file in the root directory of the archive for information about the directory structure and contents of the entire zipped archive. References Plesch, A., Marshall, S. T., Nicholson, C., Shaw, J. H., Maechling, P., Su, M-H. “The Community Fault Model version 5.3 and new web-based tools” Virtual Poster Presentation at the 2020 SCEC Annual Meeting. SCEC Contribution 10547. Shaw, J. H., Plesch, A., Tape, C., Suess, M., Jordan, T. H., Ely, G., Hauksson, E., Tromp, J., Tanimoto, T., Graves, R., Olsen, K., Nicholson, C., Maechling, P. J., Rivero, C., Lovely, P., Brankman, C. M., & Munster, J. (2015). Unified Structural Representation of the southern California crust and upper mantle. Earth and Planetary Science Letters, 415, 1-15. doi: 10.1016/j.epsl.2015.01.016. SCEC Contribution 2068