Gaithersburg zipcode
| City | Gaithersburg |
| ZIP Code | 20878 |
| Type | Standard |
| State Code | MD |
| State | Maryland |
ZIP code of Gaithersburg is 20878. This place is located in Maryland state in US. To send any postal service to Gaithersburg, you must use 20878 zipcode.
The ZIP code 20878 is also used with 4 more city names of Maryland.
- Darnestown, MD
- N Potomac, MD
- No Potomac, MD
- North Potomac, MD