Gaithersburg, MD ZIP codes
Gaithersburg, Maryland has 9 ZIP codes, including 4 PO Box ZIPs. They are in Montgomery County.
- Population in these ZIPs
- 143,733
- Avg. median income
- $128,600population-weighted
- Typical home value
- $590,100population-weighted
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Gaithersburg, MD ZIP codes list
| ZIP code | County | Population | Median income | Typical home value |
|---|---|---|---|---|
| 20877 | Montgomery County | 38,546 | $92,800 | $467,800 |
| 20878 | Montgomery County | 66,115 | $144,313 | $680,700 |
| 20879 | Montgomery County | 25,264 | $112,104 | $433,100 |
| 20882 | Montgomery County | 13,751 | $184,136 | $785,800 |
| 20883 PO Box | Montgomery County | — | — | — |
| 20884 PO Box | Montgomery County | — | — | — |
| 20885 PO Box | Montgomery County | — | — | — |
| 20898 PO Box | Montgomery County | — | — | — |
| 20899 | Montgomery County | 57 | $24,417 | — |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Gaithersburg
- Washington Grove 1 mi
- Montgomery Village 3 mi
- Germantown 3 mi
- Derwood 4 mi
- Potomac 4 mi
- Rockville 5 mi
- Olney 7 mi
- Boyds 7 mi
- Brookeville 8 mi
- Sandy Spring 9 mi
- Clarksburg 9 mi
- Garrett Park 10 mi
Frequently asked questions
What is the ZIP code for Gaithersburg, MD?
Gaithersburg, MD has 9 ZIP codes: 20877, 20878, 20879, 20882, 20883, 20884, 20885, 20898 and 20899.
What county is Gaithersburg, Maryland in?
Gaithersburg ZIP codes are in Montgomery County.
Which Gaithersburg ZIP codes are PO Boxes?
20883, 20884, 20885 and 20898 are PO Box or single-organization ZIP codes; they have no residential delivery area.