Detailed information about ZIP code 51111 located in Sioux-city, Iowa. This postal code covers standard areas with a population of an undefined number of residents.
About 51111 ZIP Code Area
The ZIP code 51111 is part of the USPS (United States Postal Service) system serving the Sioux-city area. This code ensures efficient mail delivery and geographic organization within Iowa.
ZIP Code (Zip Code) - Representación de área del código postal de los correos de los Estados Unidos.
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Código Postal EEUU - IOWA - SIOUX-CITY - 51111
ZIP Code 51111 - Sioux-city, IOWA
Detailed information about ZIP code 51111 located in Sioux-city, Iowa. This postal code covers standard areas with a population of an undefined number of residents.
About 51111 ZIP Code Area
The ZIP code 51111 is part of the USPS (United States Postal Service) system serving the Sioux-city area. This code ensures efficient mail delivery and geographic organization within Iowa.
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Definitions of Status
PRIMARY: Refers to the main name of the city, typically its official designation. Although the city might have an ACCEPTABLE alternative name, the primary name remains the official one.
ACCEPTABLE: Indicates a suitable alternative city name. Commonly abbreviated city names are often listed as unacceptable because abbreviations are not considered an acceptable city name format.
IMPROPER/NOT ACCEPTABLE: Denotes that an inappropriate city name was entered or received based on the provided information.
UNIQUE: Assigned to a business, government agency, or entity with a significant mail volume. This designation depends on the average daily volume of letter-sized mail received, the availability of ZIP code numbers in the postal area, and a cost-benefit analysis by the postal service.
