20260831 16445700 1.0 FALSE ZIP Geographic GCS_WGS_1984 Angular Unit: Degree (0.017453) <GeographicCoordinateSystem xsi:type='typens:GeographicCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.7.0'><WKT>GEOGCS[&quot;GCS_WGS_1984&quot;,DATUM[&quot;D_WGS_1984&quot;,SPHEROID[&quot;WGS_1984&quot;,6378137.0,298.257223563]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433],AUTHORITY[&quot;EPSG&quot;,4326]]</WKT><XOrigin>-400</XOrigin><YOrigin>-400</YOrigin><XYScale>999999999.99999988</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>8.983152841195215e-09</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><LeftLongitude>-180</LeftLongitude><WKID>4326</WKID><LatestWKID>4326</LatestWKID></GeographicCoordinateSystem> 150000000 5000 ISO19115_3 20260716 17515600 20260724 16120800 United States ZIP Code Boundaries provides a 2024 boundary with a total population count. A Living Atlas item from ArcGIS Online. U.S. ZIP Code Boundaries represents five-digit ZIP Code areas used by the U.S. Postal Service to deliver mail more effectively. The first digit of a five-digit ZIP Code divides the United States into 10 large groups of states (or equivalent areas) numbered from 0 in the Northeast to 9 in the far West. Within these areas, each state is divided into an average of 10 smaller geographical areas, identified by the second and third digits. These digits, in conjunction with the first digit, represent a Sectional Center Facility (SCF) or a mail processing facility area. The fourth and fifth digits identify a post office, station, branch or local delivery area. The boundaries are sourced from TomTom (June 2024) and the 2023 population estimates are from Esri Demographics. This layer is updated annually. The POSTCODE and STFIPS were added afterward. Esri; TomTom; United States Postal Service (USPS) ZIP Code Boundaries 2025-04-07 2025-07-02 EPA Place Names 2015-01-31 https://ofmpub.epa.gov/sor_internet/registry/termreg/searchandretrieve/taxonomies/search.do?search=&searchString=&taxonomyName=WBT%20-%20Geographic%20Locations Web Taxonomy - Geographic Locations EPA Place Names 2015-01-31 https://ofmpub.epa.gov/sor_internet/registry/termreg/searchandretrieve/taxonomies/search.do?search=&searchString=&taxonomyName=WBT%20-%20Geographic%20Locations Web Taxonomy - Geographic Locations United States EPA GIS Keyword Thesaurus 2007-11-02 https://www.epa.gov/geospatial/epa-metadata-technical-specification EPA Metadata Technical Specification Boundaries United States This work is licensed under the Esri Master License Agreement. Esri ArcGIS 13.7.0.1901 File Geodatabase https://services.arcgis.com/P3ePLMYs2RVChkJx/arcgis/rest/services/USA_Boundaries_2023/FeatureServer WWW:LINK 2026-07-24 downloaded from ArcGIS Online Living Atlas. POSTCODE was added and assigned to ZIP for application use. STFIPS was added by joining the States layer based on the state abbreviation. dataset EPSG 6.2(3.0.1) 0 Simple FALSE 0 TRUE FALSE ZIP Feature Class 0 OBJECTID OBJECTID OID 4 0 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Shape Geometry 0 0 0 Feature geometry. Esri Coordinates defining the features. ZIP ZIP Code String 10 0 0 PO_NAME Post Office Name String 100 0 0 STATE State Abbreviation String 2 0 0 POSTCODE POSTCODE String 10 0 0 POPULATION 2023 Total Population Integer 4 0 0 POP_SQMI 2023 Population Density Double 8 0 0 AREA Area in Square Miles Double 8 0 0 GEOID GEOID String 2 0 0 Shape_Length Shape_Length Double 8 0 0 Length of feature in internal units. Esri Positive real numbers that are automatically generated. Shape_Area Shape_Area Double 8 0 0 Area of feature in internal units squared. Esri Positive real numbers that are automatically generated.