ZIP code 20851
Where is ZIP code 20851?
Rockville, Maryland
Montgomery County · Standard ZIP code
ZIP code 20851 belongs to Rockville, Maryland in Montgomery County. 20851 is a standard ZIP code, so it covers street addresses as well as PO Boxes. It is in the Eastern Time zone and uses area codes 227, 240 and 301. About 14,946 people live in the 20851 area, where the median household income is $126,411. The closest ZIP codes are 20847 (Rockville, 1.7 mi west), 20849 (Rockville, 1.7 mi west) and 20857 (Rockville, 1.7 mi west).
| ZIP code | 20851 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Rockville |
| State | Maryland (MD) |
| County | Montgomery County |
| Time zone | Eastern Time · now |
| Area codes | 227, 240, 301 |
| Coordinates | 39.0763, -77.1234 map |
| 3-digit prefix | 208 |
Population and income in 20851
| Population | 14,946 · higher than 68% of Maryland ZIP codes |
|---|---|
| People per square mile | 5,894 · higher than 92% of Maryland ZIP codes |
| Median age | 38.6 years · lower than 69% of Maryland ZIP codes |
| Men / women | 51% / 50% |
| Median household income | $126,411 · higher than 68% of Maryland ZIP codes |
| Income per person | $51,567 |
| Below the poverty line | 9.1% |
| Bachelor’s degree or higher | 46% of adults 25+ |
| Median home value | $568,900 · higher than 78% of Maryland ZIP codes |
| Median rent | $2,043 a month |
| Housing units | 5,338 |
| Households | 5,155 (2.89 people on average) |
| Owners / renters | 58% / 43% |
| Land area | 2.54 sq mi |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 20851. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 20851
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 20847 | Rockville, MD | 1.7 mi W | PO Box only |
| 20849 | Rockville, MD | 1.7 mi W | PO Box only |
| 20857 | Rockville, MD | 1.7 mi W | Unique |
| 20853 | Rockville, MD | 1.7 mi NE | Standard |
| 20852 | Rockville, MD | 1.9 mi S | Standard |
| 20883 | Gaithersburg, MD | 2 mi NW | PO Box only |
| 20850 | Rockville, MD | 2.5 mi W | Standard |
| 20896 | Garrett Park, MD | 3.2 mi SE | PO Box only |
| 20906 | Silver Spring, MD | 3.4 mi E | Standard |
| 20897 | Suburb Maryland Fac, MD | 3.6 mi E | Unique |
| 20895 | Kensington, MD | 4 mi SE | Standard |
| 20855 | Derwood, MD | 4.2 mi N | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 20851 or measure the distance to another ZIP code.
How to address mail to 20851
123 MAIN ST
ROCKVILLE MD 20851
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (20851-XXXX) helps mail sort faster but isn’t required.
Other ZIP codes in Rockville, MD
All Rockville ZIP codes with population and income →
Questions
- What city is ZIP code 20851?
- 20851 is a Rockville, Maryland ZIP code.
- What county is 20851 in?
- ZIP code 20851 is in Montgomery County, Maryland.
- What time zone is ZIP code 20851 in?
- 20851 is in the Eastern Time zone (America/New_York).
- What area code is 20851?
- Phone numbers in ZIP code 20851 use area codes 227, 240 and 301.
- What is the population of ZIP code 20851?
- About 14,946 people live in ZIP code 20851, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 20851?
- The median household income in 20851 is $126,411 a year, higher than 68% of Maryland ZIP codes.
- What ZIP codes are near 20851?
- The nearest ZIP codes to 20851 are 20847 (Rockville, 1.7 miles), 20849 (Rockville, 1.7 miles), 20857 (Rockville, 1.7 miles) and 20853 (Rockville, 1.7 miles).