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The fourth and fifth digits identify a post office, station, branch or local delivery area.The boundaries are sourced from TomTom (December 2021) and the population estimates are from the Esri Demographics Team.In January, 2023, TNR GIS downloaded this dataset as a layer package (by esri_dm) from here, selected features using Select By Location (using the intersect the source layer feature method using the Travis County Boundary polygon as the Source data) and reprojected it to NAD 83 State Plane. This dataset is the output. When updating ZIP codes, please follow these steps and give the new/updated datasets the same names. 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