ZIP code 21104
Where is ZIP code 21104?
Marriottsville, Maryland
Howard County · Standard ZIP code
ZIP code 21104 belongs to Marriottsville, Maryland in Howard County. 21104 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 6,052 people live in the 21104 area, where the median household income is $191,804. The closest ZIP codes are 21163 (Woodstock, 3.8 mi east), 21794 (West Friendship, 4 mi southwest) and 21723 (Cooksville, 5 mi west).
| ZIP code | 21104 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Marriottsville |
| Also accepted | Henryton, Marriottsvl, Woodstock |
| State | Maryland (MD) |
| County | Howard County |
| Time zone | Eastern Time · now |
| Area codes | 410, 443, 667 |
| Coordinates | 39.3342, -76.9132 map |
| 3-digit prefix | 211 |
Population and income in 21104
| Population | 6,052 · higher than 52% of Maryland ZIP codes |
|---|---|
| People per square mile | 355 · lower than 52% of Maryland ZIP codes |
| Median age | 43.1 years · higher than 57% of Maryland ZIP codes |
| Men / women | 50% / 50% |
| Median household income | $191,804 · higher than 93% of Maryland ZIP codes |
| Income per person | $74,405 |
| Below the poverty line | 2.7% |
| Bachelor’s degree or higher | 64% of adults 25+ |
| Median home value | $680,200 · higher than 89% of Maryland ZIP codes |
| Median rent | $1,384 a month |
| Housing units | 2,204 |
| Households | 2,097 (2.88 people on average) |
| Owners / renters | 97% / 3.0% |
| Land area | 17.05 sq mi (plus 0.81 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 21104. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21104
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21163 | Woodstock, MD | 3.8 mi E | Standard |
| 21794 | West Friendship, MD | 4 mi SW | Standard |
| 21723 | Cooksville, MD | 5 mi W | Standard |
| 21042 | Ellicott City, MD | 5.1 mi SE | Standard |
| 21738 | Glenwood, MD | 6.6 mi SW | Standard |
| 21133 | Randallstown, MD | 6.7 mi NE | Standard |
| 21244 | Windsor Mill, MD | 6.9 mi E | Standard |
| 21041 | Ellicott City, MD | 6.9 mi S | PO Box only |
| 21150 | Simpsonville, MD | 6.9 mi S | PO Box only |
| 21737 | Glenelg, MD | 7.9 mi SW | Standard |
| 21797 | Woodbine, MD | 8.1 mi W | Standard |
| 21043 | Ellicott City, MD | 8.2 mi SE | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21104 or measure the distance to another ZIP code.
How to address mail to 21104
123 MAIN ST
MARRIOTTSVILLE MD 21104
Put the city, the two-letter state code and the ZIP code on the last line. USPS also accepts HENRYTON, MARRIOTTSVL and WOODSTOCK as the city name for 21104. Adding the 4-digit ZIP+4 code (21104-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 21104?
- 21104 is a Marriottsville, Maryland ZIP code. Henryton, Marriottsvl and Woodstock are also accepted as the city name.
- What county is 21104 in?
- ZIP code 21104 is in Howard County, Maryland.
- What time zone is ZIP code 21104 in?
- 21104 is in the Eastern Time zone (America/New_York).
- What area code is 21104?
- Phone numbers in ZIP code 21104 use area codes 410, 443 and 667.
- What is the population of ZIP code 21104?
- About 6,052 people live in ZIP code 21104, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 21104?
- The median household income in 21104 is $191,804 a year, higher than 93% of Maryland ZIP codes.
- What ZIP codes are near 21104?
- The nearest ZIP codes to 21104 are 21163 (Woodstock, 3.8 miles), 21794 (West Friendship, 4 miles), 21723 (Cooksville, 5 miles) and 21042 (Ellicott City, 5.1 miles).