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City ZIP codes · Maryland

Ellicott City, MD ZIP Codes

3 ZIP codes use the postal name Ellicott City, Maryland (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 2 residential and 1 for PO boxes or a single organization. Median household income runs from $148,125 in 21043 to $190,061 in 21042, 1.3 times as much (Census Bureau, ACS 2020-2024). Ellicott City's most populous ZIP code is 21043, with 48,525 people (ACS 2020-2024); 72% of its land is in the city of Ellicott City.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Ellicott City's ZIP codes?

21042: $190k median household income21043: $148k median household income210422104321042: $190k median household income21043: $148k median household income210422104321042: $190k median household income21043: $148k median household income2104221043
The 2 residential ZIP codes named Ellicott City, 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 Ellicott City's ZIP codes?

The highest median household income is in 21042 ($190,061), the lowest in 21043 ($148,125). Home values run from $620,900 in 21043 to $706,400 in 21042.

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

All 2 residential ZIP codes of Ellicott City

Residential ZIP codes with the postal name Ellicott City, MD, largest first (ACS 2020-2024); sort by any column
County
21043 Howard County 48,525 2,838 $148k $621k
21042 Howard County 43,327 1,171 $190k $706k

Download the 3 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 Ellicott City

1 ZIP code named Ellicott City has 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.

Ellicott City, MD: ZIP codes without a residential area, for PO boxes or one organization (GeoNames postal codes; USPS does not publish openly which is which)
ZIPCounty
21041Howard County

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

Which counties do Ellicott City's ZIP codes reach?

Ellicott City's residential ZIP codes lie in 2 counties: Howard County (2 ZIP codes mainly there), Baltimore County (part of a ZIP code).

Which places do Ellicott City's ZIP codes cover?

A postal name is not a city limit. By the Census Bureau's places, Ellicott City's residential ZIP codes cover Ellicott City itself and 1 other place, each listed with the ZIP codes that have at least 5% of their land in it or hold most of the place:

  • Ilchester census-designated 21043

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

Which first three digits do Ellicott City'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 Ellicott City starts with 210.

Three-digit prefixes of Ellicott City'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 Ellicott City's
PrefixSectional centerHereAll codes
210 Linthicum, MD (SCF 210) 3 58

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