Thank you for purchasing the zip code shapefile. Your purchse helps support our work here and it is very much appreciated. This shapefile is derived from the latest U.S. Census data. Below are the field descriptions: 5-Digit ZIP Code Tabulation Area (ZCTA5) Nation-based Shapefile Record Layout (2010 Census) Field Description ZCTA5CE10 2010 Census 5-digit ZIP Code Tabulation Area code GEOID10 2010 Census 5-digit ZIP Code Tabulation Area identifier, 2010 Census 5-digit ZIP Code Tabulation Area code CLASSFP10 2010 Census FIPS 55 class code MTFCC10 MAF/TIGER feature class code (G6350) FUNCSTAT10 2010 Census functional status ALAND10 2010 Census land area AWATER10 2010 Census water area INTPTLAT10 2010 Census latitude of the internal point INTPTLON10 2010 Census longitude of the internal point URL https://mapcruzin.com/census-shapefile-demographics/zipcode-shapefiles/. This is where you may find updates and more information about this and related shapefiles. To learn more about GIS, check http://www.learn2map.com for a free GIS tutorial and atlas. Free GIS software is available at: https://mapcruzin.com/free-gis-software-tools.htm Free GIS shapefiles are available at: https://mapcruzin.com/download-free-arcgis-shapefiles.htm Soon we will be adding the most recent demographic data and also new shapefiles including zipcode, census tract, census block and many more. Consider visiting our blog http://mapcruzin.blogspot.com for updates and to sign up for our RSS feed. Thanks again, Mike Meusesr https://mapcruzin.com