ZIP code 21770
Where is ZIP code 21770?
Monrovia, Maryland
Frederick County · Standard ZIP code
ZIP code 21770 belongs to Monrovia, Maryland in Frederick County. 21770 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 8,751 people live in the 21770 area, where the median household income is $183,571. The closest ZIP codes are 21754 (Ijamsville, 3 mi southwest), 21774 (New Market, 4.3 mi north) and 21771 (Mount Airy, 5.2 mi east).
| ZIP code | 21770 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Monrovia |
| State | Maryland (MD) |
| County | Frederick County |
| Time zone | Eastern Time · now |
| Area codes | 227, 240, 301 |
| Coordinates | 39.3512, -77.2494 map |
| 3-digit prefix | 217 |
Population and income in 21770
| Population | 8,751 · higher than 59% of Maryland ZIP codes |
|---|---|
| People per square mile | 764 · higher than 62% of Maryland ZIP codes |
| Median age | 39.8 years · lower than 63% of Maryland ZIP codes |
| Men / women | 49% / 51% |
| Median household income | $183,571 · higher than 92% of Maryland ZIP codes |
| Income per person | $58,954 |
| Below the poverty line | 1.5% |
| Bachelor’s degree or higher | 55% of adults 25+ |
| Median home value | $632,500 · higher than 86% of Maryland ZIP codes |
| Housing units | 2,632 |
| Households | 2,622 (3.34 people on average) |
| Owners / renters | 99% / 1.2% |
| Land area | 11.45 sq mi (plus 0.01 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 21770. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21770
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21754 | Ijamsville, MD | 3 mi SW | Standard |
| 21774 | New Market, MD | 4.3 mi N | Standard |
| 21771 | Mount Airy, MD | 5.2 mi E | Standard |
| 20872 | Damascus, MD | 5.5 mi S | Standard |
| 21704 | Frederick, MD | 7.2 mi W | Standard |
| 20871 | Clarksburg, MD | 7.9 mi S | Standard |
| 21701 | Frederick, MD | 8 mi NW | Standard |
| 21762 | Libertytown, MD | 9.1 mi N | PO Box only |
| 21792 | Unionville, MD | 9.2 mi N | PO Box only |
| 21765 | Lisbon, MD | 9.5 mi E | PO Box only |
| 21717 | Buckeystown, MD | 9.6 mi W | PO Box only |
| 21705 | Frederick, MD | 9.6 mi NW | PO Box only |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21770 or measure the distance to another ZIP code.
How to address mail to 21770
123 MAIN ST
MONROVIA MD 21770
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (21770-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 21770?
- 21770 is a Monrovia, Maryland ZIP code.
- What county is 21770 in?
- ZIP code 21770 is in Frederick County, Maryland.
- What time zone is ZIP code 21770 in?
- 21770 is in the Eastern Time zone (America/New_York).
- What area code is 21770?
- Phone numbers in ZIP code 21770 use area codes 227, 240 and 301.
- What is the population of ZIP code 21770?
- About 8,751 people live in ZIP code 21770, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 21770?
- The median household income in 21770 is $183,571 a year, higher than 92% of Maryland ZIP codes.
- What ZIP codes are near 21770?
- The nearest ZIP codes to 21770 are 21754 (Ijamsville, 3 miles), 21774 (New Market, 4.3 miles), 21771 (Mount Airy, 5.2 miles) and 20872 (Damascus, 5.5 miles).