Gaithersburg, MD ZIP Codes
5 ZIP codes serve Gaithersburg, Maryland: 20878, 20877, 20879, 20882 and 20899. Together they are home to 143,733 residents in 50,157 households. That is more than the 69,825 people counted inside Gaithersburg city limits, because these ZIP codes reach past its boundary. Median household income ranges from $92,800 in 20877 to $184,136 in 20882.
Gaithersburg city limits (Census)
| Measure | Census figure |
|---|---|
| Residents | 69,825 |
| Households | 25,772 |
| Median household income | $112,467 |
| Median home value | $496,500 |
| Median age | 37.8 |
| Median rent | $2,058 |
All 5 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 143,733 |
| Households (sum of ZIP codes) | 50,157 |
| Median household income, range across ZIP codes | $92,800 (20877) to $184,136 (20882) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $129,610 |
| Homeowners | 65.2% |
| Households with kids under 18 | 33.9% |
| Moved in the past year | 11.7% |
| Carrier routes in EDDM2GO's route library | 106 routes, 53,379 homes (4 of 5 ZIP codes) |
Top facts
- Highest median household income in Gaithersburg: 20882 ($184,136)
- Most residents: 20878 (66,115 people)
- Highest homeownership: 20882 (96.3% own their home)
- Most households with kids: 20877 (35.9% of households)
- Most new movers: 20877 (15.6% moved in last year)
- Youngest median age: 20879 (36.4 years)
- Highest median home value: 20882 ($737,400)
Every ZIP code in Gaithersburg
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 20878 | Gaithersburg | 66,115 | 24,237 | $144,313 | $715,800 | 69.2% | 34.3% | 11.4% | 51 | 27,026 | 27% of its land; mailing city |
| 20877 | Gaithersburg | 38,546 | 12,519 | $92,800 | $474,800 | 43.1% | 35.9% | 15.6% | 26 | 15,151 | 66% of its land; mailing city |
| 20879 | Gaithersburg | 25,264 | 8,651 | $112,104 | $468,100 | 69.8% | 30.7% | 9.3% | 18 | 10,323 | 11% of its land; mailing city |
| 20882 | Gaithersburg | 13,751 | 4,693 | $184,136 | $737,400 | 96.3% | 33.2% | 6.2% | 11 | 4,814 | mailing city |
| 20899 | Gaithersburg | 57 | 57 | $24,417 | — | 0.0% | 0.0% | 17.5% | — | — | 100% of its land; mailing city |
A ZIP code is listed for Gaithersburg when at least 10% of its land lies inside Gaithersburg city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Gaithersburg. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Gaithersburg.
Counties
- Montgomery County — 48 ZIP codes
Nearby cities sharing these ZIP codes
- North Potomac — 2 ZIP codes
- Darnestown — 2 ZIP codes
- Redland — 2 ZIP codes
- Flower Hill — 1 ZIP code
- Damascus — 2 ZIP codes
Price a mailing to Gaithersburg ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Gaithersburg, MD?
- 20878, 20877, 20879, 20882 and 20899. A ZIP code is listed for Gaithersburg when at least 10% of its land lies inside Gaithersburg city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Gaithersburg.
- What is the population of Gaithersburg, MD?
- The Census Bureau counts 69,825 residents inside Gaithersburg city limits (ACS 2020–2024). The 5 ZIP codes that serve Gaithersburg hold 143,733 residents in all.
- What is the median household income in Gaithersburg, MD?
- $112,467 inside Gaithersburg city limits, per the Census Bureau. Across its ZIP codes the medians run from $92,800 to $184,136.
- Which Gaithersburg ZIP code has the highest median household income?
- 20882, at $184,136, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in Gaithersburg, MD?
- For the 4 of 5 ZIP codes in EDDM2GO's stored route library: 106 carrier routes reaching 53,379 residential and 3,931 business mailboxes. The route map loads the rest when you search them.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.