ZIP code 21771
Where is ZIP code 21771?
Mount Airy, Maryland
Frederick County · Standard ZIP code
ZIP code 21771 belongs to Mount Airy, Maryland in Frederick County. 21771 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, 301, 410, 443 and 667. About 33,031 people live in the 21771 area, where the median household income is $157,302. The closest ZIP codes are 21765 (Lisbon, 5.2 mi southeast), 21770 (Monrovia, 5.2 mi west) and 21797 (Woodbine, 5.3 mi east).
| ZIP code | 21771 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Mount Airy |
| State | Maryland (MD) |
| County | Frederick County |
| Time zone | Eastern Time · now |
| Area codes | 227, 240, 301, 410, 443, 667 |
| Coordinates | 39.3741, -77.1563 map |
| 3-digit prefix | 217 |
Population and income in 21771
| Population | 33,031 · higher than 85% of Maryland ZIP codes |
|---|---|
| People per square mile | 369 · lower than 51% of Maryland ZIP codes |
| Median age | 40.9 years · lower than 57% of Maryland ZIP codes |
| Men / women | 51% / 49% |
| Median household income | $157,302 · higher than 82% of Maryland ZIP codes |
| Income per person | $60,220 |
| Below the poverty line | 3.1% |
| Bachelor’s degree or higher | 49% of adults 25+ |
| Median home value | $556,200 · higher than 76% of Maryland ZIP codes |
| Median rent | $2,252 a month |
| Housing units | 11,758 |
| Households | 11,226 (2.93 people on average) |
| Owners / renters | 94% / 6.0% |
| Land area | 89.52 sq mi (plus 0.18 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 21771. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21771
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21765 | Lisbon, MD | 5.2 mi SE | PO Box only |
| 21770 | Monrovia, MD | 5.2 mi W | Standard |
| 21797 | Woodbine, MD | 5.3 mi E | Standard |
| 21774 | New Market, MD | 6.8 mi W | Standard |
| 21792 | Unionville, MD | 7.1 mi N | PO Box only |
| 20872 | Damascus, MD | 7.4 mi SW | Standard |
| 21754 | Ijamsville, MD | 8.2 mi SW | Standard |
| 21723 | Cooksville, MD | 8.9 mi SE | Standard |
| 21762 | Libertytown, MD | 8.9 mi NW | PO Box only |
| 20882 | Gaithersburg, MD | 9.7 mi S | Standard |
| 21738 | Glenwood, MD | 10 mi SE | Standard |
| 21776 | New Windsor, MD | 10.2 mi N | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21771 or measure the distance to another ZIP code.
How to address mail to 21771
123 MAIN ST
MOUNT AIRY MD 21771
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (21771-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 21771?
- 21771 is a Mount Airy, Maryland ZIP code.
- What county is 21771 in?
- ZIP code 21771 is in Frederick County, Maryland.
- What time zone is ZIP code 21771 in?
- 21771 is in the Eastern Time zone (America/New_York).
- What area code is 21771?
- Phone numbers in ZIP code 21771 use area codes 227, 240, 301, 410, 443 and 667.
- What is the population of ZIP code 21771?
- About 33,031 people live in ZIP code 21771, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 21771?
- The median household income in 21771 is $157,302 a year, higher than 82% of Maryland ZIP codes.
- What ZIP codes are near 21771?
- The nearest ZIP codes to 21771 are 21765 (Lisbon, 5.2 miles), 21770 (Monrovia, 5.2 miles), 21797 (Woodbine, 5.3 miles) and 21774 (New Market, 6.8 miles).