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City ZIP codes · Pennsylvania

New Castle, PA ZIP Codes

6 ZIP codes use the postal name New Castle, Pennsylvania (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 3 residential and 3 for PO boxes or a single organization. Median household income runs from $51,128 in 16101 to $65,855 in 16105, 1.3 times as much (Census Bureau, ACS 2020-2024). New Castle's most populous ZIP code is 16101, with 30,767 people (ACS 2020-2024); 8% of its land is in the city of New Castle.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are New Castle's ZIP codes?

16101: $51k median household income16102: $56k median household income16105: $66k median household income16101161051610216101: $51k median household income16102: $56k median household income16105: $66k median household income16101161051610216101: $51k median household income16102: $56k median household income16105: $66k median household income161011610516102
The 3 residential ZIP codes named New Castle, shaded by median household income in national fifths (ACS 2020-2024). Select a ZIP to open it. <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are New Castle's ZIP codes?

The highest median household income is in 16105 ($65,855), the lowest in 16101 ($51,128). Home values run from $104,900 in 16102 to $183,500 in 16105.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013, B25077, B01003).

All 3 residential ZIP codes of New Castle

Residential ZIP codes with the postal name New Castle, PA, largest first (ACS 2020-2024); sort by any column
County
16101 Lawrence County 30,767 444 $51k $111k
16105 Lawrence County 15,418 603 $66k $184k
16102 Lawrence County 4,929 202 $56k $105k

Download the 6 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; 2023 Gazetteer land areas (2020 ZCTAs); town names from simplemaps US ZIP Codes (CC BY 4.0) and GeoNames (CC BY 4.0).

PO Box and single-organization ZIP codes in New Castle

3 ZIP codes named New Castle have no residential delivery area: post office boxes, or one organization (a large employer, an agency, a university) with its own code. The Census Bureau publishes no figures for them.

New Castle, PA: ZIP codes without a residential area, for PO boxes or one organization (GeoNames postal codes; USPS does not publish openly which is which)
ZIPCounty
16103Lawrence County
16107Lawrence County
16108Lawrence County

Source: GeoNames postal codes (CC BY 4.0); a ZIP code with no Census ZCTA has no residential delivery area.

Which counties do New Castle's ZIP codes reach?

New Castle's residential ZIP codes lie in Lawrence County.

Which places do New Castle's ZIP codes cover?

A postal name is not a city limit. By the Census Bureau's places, New Castle's residential ZIP codes cover New Castle itself and 4 other places, each listed with the ZIP codes that have at least 5% of their land in it or hold most of the place:

  • New Castle Northwest census-designated 16105
  • Oakland census-designated 16101
  • Oakwood census-designated 16101
  • South New Castle 16102

Source: U.S. Census Bureau, 2020 ZCTA-to-place relationship file (shares of land).

Which first three digits do New Castle's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of New Castle starts with 161.

Three-digit prefixes of New Castle's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are New Castle's
PrefixSectional centerHereAll codes
161 Pittsburgh, PA (SCF 150) 6 45

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.