ZIP code 20878: Gaithersburg, MD
20878 is a ZIP code in Gaithersburg, Maryland, mainly in Montgomery County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metro area. About 66,115 people live here.
- Population
- 66,115
- Median household income
- $144,313
- Typical home value
- $680,700-0.6% in 12 months
- Median rent
- $2,226gross, per month
- Median age
- 41.4
- Homeowners
- 69.2%of occupied homes
Shaded: ZIP code 20878's area. Click anywhere on the map to see which ZIP code it's in.
ZIP codes within 10 milesWithin 25 miles
ZIP code 20878 details
| City | Gaithersburg |
|---|---|
| State | Maryland |
| County | Montgomery County |
| Metro area | Washington-Arlington-Alexandria, DC-VA-MD-WV |
| Time zone | Eastern Time (UTC−5), observes daylight saving time |
| Type | Standard (delivery area) |
| Land area | 20.5 sq mi, plus 0.4 sq mi of water |
| Population density | 3,233 people per sq mi |
| Bachelor's degree or higher | 70.3% of adults 25+ |
| Average commute | 29.4 minutes |
| Center coordinates | 39.11264, -77.25044 |
Median rent in 20878 by bedrooms
| Size | Median gross rent |
|---|---|
| Studio | $2,097/mo |
| 1 bedroom | $1,919/mo |
| 2 bedrooms | $2,197/mo |
| 3 bedrooms | $2,543/mo |
| 4 bedrooms | $3,347/mo |
| 5+ bedrooms | $3,501/mo |
Gross rent includes utilities paid by the tenant. ACS 2020–2024; sizes with too few rentals to estimate are left out.
ZIP codes near 20878
| ZIP code | City | Distance | Population |
|---|---|---|---|
| 20899 | Gaithersburg, MD | 2.9 mi | 57 |
| 20874 | Germantown, MD | 3.1 mi | 62,738 |
| 20898 | Gaithersburg, MD | 3.2 mi | — |
| 20859 | Potomac, MD | 3.2 mi | — |
| 20875 | Germantown, MD | 3.2 mi | — |
| 20884 | Gaithersburg, MD | 3.2 mi | — |
| 20813 | Bethesda, MD | 3.2 mi | — |
| 20897 | Suburb Maryland Fac, MD | 3.2 mi | — |
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
Buying a home in 20878?
A typical home in ZIP code 20878 is worth about $680,700 (Zillow Home Value Index). The median household here earns $144,313 a year. See what buying here would cost per month, with Maryland average taxes and insurance filled in.
Monthly payment for a $680,700 homeWhat can a $144,313 income afford?Rental property numbers
About ZIP code 20878
What city is ZIP code 20878?
ZIP code 20878 is in Gaithersburg, MD, in Montgomery County.
What county is ZIP code 20878 in?
20878 is mainly in Montgomery County, Maryland.
What is the population of ZIP code 20878?
About 66,115 people live in ZIP code 20878, according to the American Community Survey 2020–2024 5-year estimates.
What time zone is ZIP code 20878 in?
20878 is in Eastern Time (UTC−5). It observes daylight saving time.