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ZIP codes

ZIP codes in New Castle County, Delaware

New Castle County has 31 ZIP codes. 29 lie entirely inside it and 2 are shared with neighboring counties, so part of their land and their people are elsewhere. About 576,156 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes
31
1 more just touches the border (under 1% of their land)
Entirely inside
29
99% or more of their land
Shared with other counties
2
Most with Kent County (2)
Most populated ZIP
19720
62,392 people · New Castle
Least populated ZIP
19732
89 people; 3 more with nobody living there
Largest ZIP by land
19734
80 sq mi · Townsend

Map of the ZIP codes in New Castle County

Kent County Cecil County, MD Kent County, MD Gloucester County, NJ Salem County, NJ Chester County, PA Delaware County, PA 19701 · Bear · 42,984 people · 100% in the county 19702 · Glasgow · 55,683 people · 100% in the county 19703 · Claymont · 15,460 people · 100% in the county 19706 · Delaware City · 2,038 people · 100% in the county 19707 · Hockessin · 17,376 people · 100% in the county 19709 · Middletown · 53,234 people · 100% in the county 19710 · 0 people · 100% in the county 19711 · Newark · 49,432 people · 100% in the county 19713 · Brookside · 30,747 people · 100% in the county 19716 · Newark · 0 people · 100% in the county 19717 · Newark · 6,036 people · 100% in the county 19720 · New Castle · 62,392 people · 100% in the county 19730 · Odessa · 425 people · 100% in the county 19731 · Port Penn · 655 people · 100% in the county 19732 · 89 people · 100% in the county 19733 · St. Georges · 186 people · 100% in the county 19734 · Townsend · 14,214 people · 100% in the county 19735 · 0 people · 100% in the county 19736 · Hockessin · 127 people · 100% in the county 19801 · Wilmington · 16,327 people · 100% in the county 19802 · Wilmington · 26,051 people · 100% in the county 19803 · Wilmington · 22,279 people · 100% in the county 19804 · Newport · 18,779 people · 100% in the county 19805 · Wilmington · 41,402 people · 100% in the county 19806 · Wilmington · 9,777 people · 100% in the county 19807 · Greenville · 7,815 people · 100% in the county 19808 · Pike Creek · 39,082 people · 100% in the county 19809 · Wilmington · 14,311 people · 100% in the county 19810 · Arden · 26,530 people · 100% in the county 19938 · Clayton · 9,561 people · 15% in the county 19977 · Smyrna · 27,704 people · 22% in the county 21912 · Cecilton · 1,536 people · 0.2% in the county
  • Entirely in the county (99% or more of its land)
  • Shared, mostly in other counties
  • Neighboring counties
Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in New Castle County

31 ZIP codes in New Castle County, DE, by number
ZIP code Main city Population Land in the county Residents in the county
19701 Bear 42,984 100% 42,984
19702 Glasgow 55,683 100% 55,683
19703 Claymont 15,460 100% 15,460
19706 Delaware City 2,038 100% 2,038
19707 Hockessin 17,376 100% 17,376
19709 Middletown 53,234 100% 53,234
19710 — 0 100% 0
19711 Newark 49,432 100% 49,432
19713 Brookside 30,747 100% 30,747
19716 Newark 0 100% 0
19717 Newark 6,036 100% 6,036
19720 New Castle 62,392 100% 62,392
19730 Odessa 425 100% 425
19731 Port Penn 655 100% 655
19732 — 89 100% 89
19733 St. Georges 186 100% 186
19734 Townsend 14,214 100% 14,214
19735 — 0 100% 0
19736 Hockessin 127 100% 127
19801 Wilmington 16,327 100% 16,327
19802 Wilmington 26,051 100% 26,051
19803 Wilmington 22,279 100% 22,279
19804 Newport 18,779 100% 18,779
19805 Wilmington 41,402 100% 41,402
19806 Wilmington 9,777 100% 9,777
19807 Greenville 7,815 100% 7,815
19808 Pike Creek 39,082 100% 39,082
19809 Wilmington 14,311 100% 14,311
19810 Arden 26,530 100% 26,530
19938 Clayton 9,561 15% ≈ 663
19977 Smyrna 27,704 22% ≈ 2,047

They also touch the county with under 1% of their land, so they aren’t counted: 21912.

ZIP codes shared with other counties

These 2 ZIP codes have part of their land in another county. The first figure is the share of their land in New Castle County; then, where the rest lies.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Wilmington (6), Newark (3), Hockessin (2), Arden (1), Bear (1), and Brookside (1); 20 places in all.

They start with 3 different three-digit prefixes, one per USPS sorting center: 197, 198, and 199.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

  • U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
  • U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
  • U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
  • U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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