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City ZIP codes · Maryland

Gaithersburg, MD ZIP Codes

9 ZIP codes use the postal name Gaithersburg, Maryland (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 5 residential and 4 for PO boxes or a single organization. Median household income runs from $92,800 in 20877 to $184,136 in 20882, 2.0 times as much (Census Bureau, ACS 2020-2024). Gaithersburg's most populous ZIP code is 20878, with 66,115 people (ACS 2020-2024); 27% of its land is in the city of Gaithersburg.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Gaithersburg's ZIP codes?

20877: $93k median household income20878: $144k median household income20879: $112k median household income20882: $184k median household income20899: $24k median household income2088220878208792087720877: $93k median household income20878: $144k median household income20879: $112k median household income20882: $184k median household income20899: $24k median household income2088220878208792087720877: $93k median household income20878: $144k median household income20879: $112k median household income20882: $184k median household income20899: $24k median household income20882208782087920877
The 5 residential ZIP codes named Gaithersburg, 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 Gaithersburg's ZIP codes?

The highest median household income is in 20882 ($184,136), the lowest in 20877 ($92,800). Home values run from $468,100 in 20879 to $737,400 in 20882.

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

All 5 residential ZIP codes of Gaithersburg

Residential ZIP codes with the postal name Gaithersburg, MD, largest first (ACS 2020-2024); sort by any column
County
20878 Montgomery County 66,115 3,233 $144k $716k
20877 Montgomery County 38,546 6,842 $93k $475k
20879 Montgomery County 25,264 2,932 $112k $468k
20882 Montgomery County 13,751 364 $184k $737k
20899 Montgomery County 57 538 $24k –

Download the 9 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 Gaithersburg

4 ZIP codes named Gaithersburg 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.

Gaithersburg, 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
20883Montgomery County
20884Montgomery County
20885Montgomery County
20898Montgomery County

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

Which counties do Gaithersburg's ZIP codes reach?

Gaithersburg's residential ZIP codes lie in Montgomery County.

Which places do Gaithersburg's ZIP codes cover?

A postal name is not a city limit. By the Census Bureau's places, Gaithersburg's residential ZIP codes cover Gaithersburg itself and 7 other places, each listed with the ZIP codes that have at least 5% of their land in it or hold most of the place:

  • Damascus census-designated 20882
  • Darnestown census-designated 20878
  • Flower Hill census-designated 20879
  • Laytonsville 20882
  • North Potomac census-designated 20878
  • Redland census-designated 20877
  • Travilah census-designated 20878

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

Which first three digits do Gaithersburg'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 Gaithersburg starts with 208.

Three-digit prefixes of Gaithersburg'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 Gaithersburg's
PrefixSectional centerHereAll codes
208 Suburban, MD (SCF 208) 9 59

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