New Castle, Delaware ZIP Code - United States

The location New Castle, DE has 2 differents ZIP Codes. Check the map below to check your ZIP Code.

	City Name	ZIP Code	ZIP Type	Estimated Population
New Castle, DE	PRIMARY	19720	STANDARD	47.355
New Castle, DE	PRIMARY	19721	UNIQUE	0

Postal Zone of New Castle, DE - USA

New Castle, DE belongs to New Castle county. Check the list of New Castle county ZIP Code.

Check the list of Delaware ZIP Code.

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PRIMARY: means an the primary city name. Official city name, although the city name might also have another acceptable name.
ACCEPTABLE: means an adequate city name. City names that are abbreviated will frequently be listed as unacceptable because abbreviations are not an acceptable city name format.
IMPROPER/NOT ACCEPTABLE: Means an inadequate city name has been entered or received based on information entered.
UNIQUE: Assigned to a company, government agency, or entity with sufficient mail volume, based on average daily volume of letter size mail received, availability of ZIP Code numbers in the postal area, and the US mail service cost-benefit analysis.