Postal reference / United States
19720New Castle, Delaware
ZIP code 19720 is a United States postal code for New Castle, Delaware. Its county association is New Castle County. The map reference point is at 39.5929, -75.6515.
- State / territory
- Delaware
- Recorded place name
- New Castle
- County association
- New Castle
- Estimated coordinate
- 39.5929, -75.6515
View on OpenStreetMap - ZIP prefix
- 197 · 27 ZIP codes share it
- Data source
- GeoNames postal reference, snapshot September 26, 2026
GeoNames reference data. County associations may not include every intersecting county, place names are postal names rather than legal boundaries, and coordinates are approximate. This is not address validation.
Area
- Land area
- 38.303 sq mi (2023 Census Gazetteer)
Figures are for the ZIP Code Tabulation Area (ZCTA) that most closely matches this ZIP code, not an exact match to USPS delivery boundaries. Source: U.S. Census Bureau, 2023 Gazetteer + 2023 ACS 5-Year Estimates, retrieved 2026-09-27. How to read this data.
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ZIP+4 depends on the full delivery address. A five-digit code alone cannot determine its extension.
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Browse the other 95 ZIP codes recorded for Delaware, sorted by code with place and county.
Delaware directoryOther ZIP codes in New Castle, DE
New Castle has 3 ZIP codes in the reference dataset.
Nearby ZIP code reference points
| ZIP code | Place | State | County association | Miles |
|---|---|---|---|---|
| 19701 | Bear | DE | New Castle | 1.7 |
| 19708 | Kirkwood | DE | New Castle | 2.3 |
| 19733 | Saint Georges | DE | New Castle | 2.6 |
| 19706 | Delaware City | DE | New Castle | 3.3 |
| 19712 | Newark | DE | New Castle | 3.5 |
| 19714 | Newark | DE | New Castle | 3.5 |
| 19715 | Newark | DE | New Castle | 3.5 |
| 19718 | Newark | DE | New Castle | 3.5 |
Straight-line distance between reference points. Nearby points do not prove that ZIP areas touch.
Verify a mailing address
For mailing, confirm the complete street or PO Box address with USPS. A place record does not confirm delivery eligibility or the ZIP+4 extension.
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