This dataset represents the spatial locations of all modeled aftershocks magnitude 2.5 and greater resulting from the HayWired M7.0 mainshock occurring on April 18, 2018 along the Hayward Fault. The date/time, horizontal and vertical location, and sequence position is provided for each aftershock. The spatial extent covers 24 counties in whole or in part, corresponding to the modeled shaking extent for the HayWired mainshock ShakeMap (available at https://earthquake.usgs.gov/scenarios/eventpage/ushaywiredm7.05_se#shakemap). The sequence is simulated based on several known statistical relationships and generated using an epidemic type aftershock sequence (ETAS) model, resulting in one possible aftershock sequence. Secondary aftershocks (aftershocks caused by other aftershocks) are also simulated in the ETAS model. Expert opinion was used to determine the appropriateness of (and correct when necessary) the locations, magnitudes, and depths for all modeled aftershocks magnitude 5 or greater. These vector-based point .SHP data were developed and are intended for use in GIS applications such as ESRI's ArcGIS software suite. These data support the following publication: Wein, A., Felzer, K.R., Jones, J.L., and Porter, Keith, 2017, HayWired scenario aftershock sequence, in Detweiler, S.T., and Wein, Anne, eds., The HayWired earthquake scenario—Earthquake hazards: U.S. Geological Survey Scientific Investigations Report 2017-5013–A–G, 22 p., https://doi.org/10.3133/sir20175013.