Plain

City ZIP codes · Maryland

Frederick, MD ZIP Codes

6 ZIP codes use the postal name Frederick, Maryland (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 5 residential and 1 for PO boxes or a single organization. Median household income runs from $106,334 in 21703 to $161,063 in 21704, 1.5 times as much (Census Bureau, ACS 2020-2024). Frederick's most populous ZIP code is 21702, with 49,605 people (ACS 2020-2024); 24% of its land is in the city of Frederick.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Frederick's ZIP codes?

21701: $107k median household income21702: $107k median household income21703: $106k median household income21704: $161k median household income21705: – median household income2170121702217032170421701: $107k median household income21702: $107k median household income21703: $106k median household income21704: $161k median household income21705: – median household income2170121702217032170421701: $107k median household income21702: $107k median household income21703: $106k median household income21704: $161k median household income21705: – median household income21701217022170321704
The 5 residential ZIP codes named Frederick, 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 Frederick's ZIP codes?

The highest median household income is in 21704 ($161,063), the lowest in 21703 ($106,334). Home values run from $384,600 in 21703 to $612,000 in 21704.

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

All 5 residential ZIP codes of Frederick

Residential ZIP codes with the postal name Frederick, MD, largest first (ACS 2020-2024); sort by any column
County
21702 Frederick County 49,605 1,189 $107k $426k
21701 Frederick County 43,048 1,084 $107k $435k
21703 Frederick County 41,960 1,310 $106k $385k
21704 Frederick County 20,006 751 $161k $612k
21705 Frederick County 6 250 – –

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 Frederick

1 ZIP code named Frederick 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.

Frederick, 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
21709Frederick County

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

Which counties do Frederick's ZIP codes reach?

Frederick's residential ZIP codes lie in Frederick County.

Which places do Frederick's ZIP codes cover?

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

  • Ballenger Creek census-designated 21703, 21704
  • Bartonsville census-designated 21704
  • Braddock Heights census-designated 21703
  • Spring Ridge census-designated 21701
  • Urbana census-designated 21704

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

Which first three digits do Frederick'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 Frederick starts with 217.

Three-digit prefixes of Frederick'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 Frederick's
PrefixSectional centerHereAll codes
217 Baltimore, MD (SCF 212) 6 66

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