For other uses, see Zipcode (disambiguation). A 1974 postage stamp encouraging people to use the ZIPCode on letters and parcels. The ZIPCode system (an acronym for Zone Improvement Plan[1]) is the system of postal codes used by the UnitedStates Postal Service (USPS). ZIPcodes for Chicago, Illinois, US. Use our interactive map, address lookup, or code list to find the correct 5-digit or 9-digit (ZIP+4) code for your postal mails destination. UnitedStatesZipCodes provides a free zipcode map and list of zipcodes by state. Information on all USZipcodes and USzipcode maps. Many tools to calculate distance between zipcodes, shipping costs, zipcodes radiuses etc. Detailed information on ZipCodes in UnitedStates.In UnitedStates the average population for a postal code is 9,737 with the most populated being zipcode 79936 in El Paso, Texas at 120,181. What is ZIPCode for UnitedStates? The UnitedStates Postal Code consists of five digits, starting with the lowest code of 00501 (Holtsville, Suffolk County, New York) to the highest of 99950 (Ketchikan, Ketchikan Gateway County, Alaska). Current local time in USA – Illinois – Chicago. Get Chicago's weather and area codes, time zone and DST. This page shows a map with an overlay of ZipCodes for the UnitedStates of America. Users can easily view the boundaries of each ZipCode and the state as a whole. ZIPCodes for UnitedStates. Use our address lookup or code list to find the correct 5-digit or 9-digit (ZIP+4) code for your postal mails destination. Are all USZIPCodes Numeric.While most ZIPcodes in the UnitedStates are composed of five digits, there are also extended versions that include a hyphen and four additional digits, making them nine digits in total. These extended codes are often referred to as ZIP+4 codes.
