Zip code 20857: Rockville, Maryland
This zip has no delivery boundary. The map shows its post office location and nearby zip codes.
About 20857
20857 is a non-residential zip code for Rockville, Maryland (Montgomery County). It has no delivery area of its own, so the Census Bureau doesn't publish population or housing figures for it. Codes like this are usually assigned to post office boxes, or to a single organization such as a university, hospital, government agency or large company that gets enough mail to need its own zip code.
For a picture of the people who live around 20857, see the residential zip codes in the nearby list below.
Geography
- City (USPS)
- Rockville
- State
- Maryland
- County
- Montgomery County
- Center point
- 39.0840° N, 77.1528° W
- Time zone
- Eastern Time (UTC-5, UTC-4 in summer)
- Zip type
- PO box or unique zip
Zip codes near 20857
| Zip | City | Distance | IncomeMedian income |
|---|---|---|---|
| 20847 | Rockville, MD · PO box | 0 mi | — |
| 20849 | Rockville, MD · PO box | 0 mi | — |
| 20883 | Gaithersburg, MD · PO box | 0.4 mi | — |
| 20850 | Rockville, MD | 1.5 mi | $125,950 |
| 20851 | Rockville, MD | 1.8 mi | $126,411 |
| 20852 | Rockville, MD | 2.7 mi | $122,472 |
| 20853 | Rockville, MD | 3.4 mi | $159,080 |
| 20855 | Derwood, MD | 3.8 mi | $149,110 |
| 20880 | Washington Grove, MD | 4.1 mi | $134,583 |
| 20877 | Gaithersburg, MD | 4.4 mi | $92,800 |
| 20896 | Garrett Park, MD | 4.6 mi | $250,000+ |
| 20813 | Bethesda, MD · PO box | 5.1 mi | — |
Questions about 20857
What city is zip code 20857?
20857 is assigned to Rockville, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.
What county is 20857 in?
20857 is in Montgomery County, Maryland.
What time zone is 20857 in?
20857 is in Eastern Time.
What zip codes are near 20857?
The closest zip codes to 20857 are 20847, 20849, 20883, 20850, 20851.
Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 20857, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.