ZIP code 20859
Where is ZIP code 20859?
Potomac, Maryland
Montgomery County · PO Box only ZIP code
ZIP code 20859 belongs to Potomac, Maryland in Montgomery County. 20859 is a PO Box only ZIP code: it is used for post office boxes at the Potomac post office, not for street addresses. It is in the Eastern Time zone and uses area code 240. The closest ZIP codes are 20813 (Bethesda, 0 mi north), 20827 (Bethesda, 0 mi north) and 20848 (Rockville, 0 mi north).
| ZIP code | 20859 |
|---|---|
| Type | PO Box only (no street delivery) |
| Status | Active |
| City | Potomac |
| Also accepted | Rockville |
| State | Maryland (MD) |
| County | Montgomery County |
| Time zone | Eastern Time · now |
| Area code | 240 |
| Coordinates | 39.144, -77.2076 map |
| 3-digit prefix | 208 |
The Census Bureau doesn’t publish population figures for po box only ZIP codes because nobody lives at a PO Box or a single organization’s address. For figures about the area, see the nearby standard ZIP codes below.
ZIP codes near 20859
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 20813 | Bethesda, MD | 0 mi N | PO Box only |
| 20827 | Bethesda, MD | 0 mi N | PO Box only |
| 20848 | Rockville, MD | 0 mi N | PO Box only |
| 20875 | Germantown, MD | 0 mi N | PO Box only |
| 20884 | Gaithersburg, MD | 0 mi N | PO Box only |
| 20889 | Bethesda, MD | 0 mi N | Unique |
| 20894 | Bethesda, MD | 0 mi N | Unique |
| 20898 | Gaithersburg, MD | 0 mi N | PO Box only |
| 20899 | Gaithersburg, MD | 0.8 mi W | Unique |
| 20877 | Gaithersburg, MD | 1 mi E | Standard |
| 20880 | Washington Grove, MD | 1.9 mi E | PO Box only |
| 20879 | Gaithersburg, MD | 2.3 mi NE | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 20859 or measure the distance to another ZIP code.
How to address mail to 20859
PO BOX 123
POTOMAC MD 20859
Put the city, the two-letter state code and the ZIP code on the last line. USPS also accepts ROCKVILLE as the city name for 20859. Adding the 4-digit ZIP+4 code (20859-XXXX) helps mail sort faster but isn’t required.
Other ZIP codes in Potomac, MD
All Potomac ZIP codes with population and income →
Questions
- What city is ZIP code 20859?
- 20859 is a Potomac, Maryland ZIP code. Rockville is also accepted as the city name.
- What county is 20859 in?
- ZIP code 20859 is in Montgomery County, Maryland.
- What time zone is ZIP code 20859 in?
- 20859 is in the Eastern Time zone (America/New_York).
- What area code is 20859?
- Phone numbers in ZIP code 20859 use area code 240.
- Can I use 20859 for a street address?
- No. 20859 is only for PO Boxes. Street addresses in Potomac use 20854.
- What ZIP codes are near 20859?
- The nearest ZIP codes to 20859 are 20813 (Bethesda, 0 miles), 20827 (Bethesda, 0 miles), 20848 (Rockville, 0 miles) and 20875 (Germantown, 0 miles).