20200407 09185400 1.0 TRUE ZIP Codes This data set provides eight feature classes. The base feature class is called esri_zp and isn't generalized. The weighted centroids feature class is called esri_zp_cent. The centroids are weighted by the U.S. Block Centroids population distribution. Use the weighted centroids in report aggregation and spatial overlay operations. The esri_zp and esri_zp_cent feature classes contain all the attributes. There are six generalized boundaries feature classes and called: esri_zp_gen2, esri_zp_gen3, esri_zp_gen4, esri_zp_gen5, esri_zp_gen6 and esri_zp_gen7. Use the generalized boundaries when creating study areas. Esri; U.S. Census Bureau