ZIP code 20878
Where is ZIP code 20878?
Gaithersburg, Maryland
Montgomery County · Standard ZIP code
ZIP code 20878 belongs to Gaithersburg, Maryland in Montgomery County. 20878 is a standard ZIP code, so it covers street addresses as well as PO Boxes. It is in the Eastern Time zone and uses area codes 227, 240 and 301. About 66,115 people live in the 20878 area, where the median household income is $144,313. The closest ZIP codes are 20874 (Germantown, 2.3 mi northwest), 20899 (Gaithersburg, 2.5 mi northeast) and 20813 (Bethesda, 3.2 mi northeast).
| ZIP code | 20878 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Gaithersburg |
| Also accepted | Darnestown, N Potomac, No Potomac, North Potomac |
| State | Maryland (MD) |
| County | Montgomery County |
| Time zone | Eastern Time · now |
| Area codes | 227, 240, 301 |
| Coordinates | 39.1125, -77.2515 map |
| 3-digit prefix | 208 |
Population and income in 20878
| Population | 66,115 · higher than 99% of Maryland ZIP codes |
|---|---|
| People per square mile | 3,233 · higher than 84% of Maryland ZIP codes |
| Median age | 41.4 years · lower than 52% of Maryland ZIP codes |
| Men / women | 48% / 52% |
| Median household income | $144,313 · higher than 78% of Maryland ZIP codes |
| Income per person | $69,431 |
| Below the poverty line | 5.2% |
| Bachelor’s degree or higher | 70% of adults 25+ |
| Median home value | $715,800 · higher than 91% of Maryland ZIP codes |
| Median rent | $2,226 a month |
| Housing units | 25,127 |
| Households | 24,237 (2.72 people on average) |
| Owners / renters | 69% / 31% |
| Land area | 20.45 sq mi (plus 0.38 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 20878. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 20878
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 20874 | Germantown, MD | 2.3 mi NW | Standard |
| 20899 | Gaithersburg, MD | 2.5 mi NE | Unique |
| 20813 | Bethesda, MD | 3.2 mi NE | PO Box only |
| 20827 | Bethesda, MD | 3.2 mi NE | PO Box only |
| 20848 | Rockville, MD | 3.2 mi NE | PO Box only |
| 20859 | Potomac, MD | 3.2 mi NE | PO Box only |
| 20875 | Germantown, MD | 3.2 mi NE | PO Box only |
| 20884 | Gaithersburg, MD | 3.2 mi NE | PO Box only |
| 20889 | Bethesda, MD | 3.2 mi NE | Unique |
| 20894 | Bethesda, MD | 3.2 mi NE | Unique |
| 20898 | Gaithersburg, MD | 3.2 mi NE | PO Box only |
| 20877 | Gaithersburg, MD | 3.9 mi NE | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 20878 or measure the distance to another ZIP code.
How to address mail to 20878
123 MAIN ST
GAITHERSBURG MD 20878
Put the city, the two-letter state code and the ZIP code on the last line. USPS also accepts DARNESTOWN, N POTOMAC, NO POTOMAC and NORTH POTOMAC as the city name for 20878. Adding the 4-digit ZIP+4 code (20878-XXXX) helps mail sort faster but isn’t required.
Other ZIP codes in Gaithersburg, MD
All Gaithersburg ZIP codes with population and income →
Questions
- What city is ZIP code 20878?
- 20878 is a Gaithersburg, Maryland ZIP code. Darnestown, N Potomac, No Potomac and North Potomac are also accepted as the city name.
- What county is 20878 in?
- ZIP code 20878 is in Montgomery County, Maryland.
- What time zone is ZIP code 20878 in?
- 20878 is in the Eastern Time zone (America/New_York).
- What area code is 20878?
- Phone numbers in ZIP code 20878 use area codes 227, 240 and 301.
- What is the population of ZIP code 20878?
- About 66,115 people live in ZIP code 20878, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 20878?
- The median household income in 20878 is $144,313 a year, higher than 78% of Maryland ZIP codes.
- What ZIP codes are near 20878?
- The nearest ZIP codes to 20878 are 20874 (Germantown, 2.3 miles), 20899 (Gaithersburg, 2.5 miles), 20813 (Bethesda, 3.2 miles) and 20827 (Bethesda, 3.2 miles).