ZIP code 21738
Where is ZIP code 21738?
Glenwood, Maryland
Howard County · Standard ZIP code
ZIP code 21738 belongs to Glenwood, Maryland in Howard County. 21738 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 410, 443 and 667. About 3,696 people live in the 21738 area, where the median household income is $250,001. The closest ZIP codes are 21737 (Glenelg, 1.7 mi south), 21794 (West Friendship, 2.8 mi east) and 21723 (Cooksville, 2.9 mi north).
| ZIP code | 21738 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Glenwood |
| State | Maryland (MD) |
| County | Howard County |
| Time zone | Eastern Time · now |
| Area codes | 410, 443, 667 |
| Coordinates | 39.2795, -77.0148 map |
| 3-digit prefix | 217 |
Population and income in 21738
| Population | 3,696 · lower than 55% of Maryland ZIP codes |
|---|---|
| People per square mile | 530 · higher than 55% of Maryland ZIP codes |
| Median age | 41.2 years · lower than 55% of Maryland ZIP codes |
| Men / women | 48% / 52% |
| Median household income | $250,001 · higher than 99% of Maryland ZIP codes |
| Income per person | $92,235 |
| Below the poverty line | 2.4% |
| Bachelor’s degree or higher | 76% of adults 25+ |
| Median home value | $914,300 · higher than 96% of Maryland ZIP codes |
| Housing units | 1,121 |
| Households | 1,121 (3.3 people on average) |
| Owners / renters | 98% / 1.8% |
| Land area | 6.98 sq mi (plus 0.04 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 21738. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21738
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21737 | Glenelg, MD | 1.7 mi S | Standard |
| 21794 | West Friendship, MD | 2.8 mi E | Standard |
| 21723 | Cooksville, MD | 2.9 mi N | Standard |
| 21036 | Dayton, MD | 3.3 mi S | Standard |
| 21041 | Ellicott City, MD | 4.9 mi SE | PO Box only |
| 21150 | Simpsonville, MD | 4.9 mi SE | PO Box only |
| 21765 | Lisbon, MD | 5.1 mi NW | PO Box only |
| 21797 | Woodbine, MD | 5.3 mi NW | Standard |
| 21029 | Clarksville, MD | 5.7 mi SE | Standard |
| 20862 | Brinklow, MD | 6.6 mi S | Standard |
| 21104 | Marriottsville, MD | 6.6 mi NE | Standard |
| 20833 | Brookeville, MD | 6.8 mi S | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21738 or measure the distance to another ZIP code.
How to address mail to 21738
123 MAIN ST
GLENWOOD MD 21738
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (21738-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 21738?
- 21738 is a Glenwood, Maryland ZIP code.
- What county is 21738 in?
- ZIP code 21738 is in Howard County, Maryland.
- What time zone is ZIP code 21738 in?
- 21738 is in the Eastern Time zone (America/New_York).
- What area code is 21738?
- Phone numbers in ZIP code 21738 use area codes 410, 443 and 667.
- What is the population of ZIP code 21738?
- About 3,696 people live in ZIP code 21738, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 21738?
- The median household income in 21738 is $250,001 a year, higher than 99% of Maryland ZIP codes.
- What ZIP codes are near 21738?
- The nearest ZIP codes to 21738 are 21737 (Glenelg, 1.7 miles), 21794 (West Friendship, 2.8 miles), 21723 (Cooksville, 2.9 miles) and 21036 (Dayton, 3.3 miles).