About 20878 - Gaithersburg, Maryland
The ZIP code 20878 of Gaithersburg falls within Maryland, the United States - a mid-sized area by population. It sits within Gaithersburg County.
Census data puts the population of this ZIP code at 37,816 residents. That's noticeably above the average for a Maryland ZIP code, which sits near 23,118 people.
Median household income is about $89,300 (near the Maryland average).
This ZIP code sits alongside neighboring areas like Essex, White Marsh, Frederick within Maryland.