ZIP code 21723
Where is ZIP code 21723?
Cooksville, Maryland
Howard County · Standard ZIP code
ZIP code 21723 belongs to Cooksville, Maryland in Howard County. 21723 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 669 people live in the 21723 area, where the median household income is $241,250. The closest ZIP codes are 21794 (West Friendship, 2.8 mi southeast), 21738 (Glenwood, 2.9 mi south) and 21797 (Woodbine, 3.6 mi northwest).
| ZIP code | 21723 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Cooksville |
| State | Maryland (MD) |
| County | Howard County |
| Time zone | Eastern Time · now |
| Area codes | 410, 443, 667 |
| Coordinates | 39.3211, -77.0051 map |
| 3-digit prefix | 217 |
Population and income in 21723
| Population | 669 · lower than 80% of Maryland ZIP codes |
|---|---|
| People per square mile | 186 · lower than 66% of Maryland ZIP codes |
| Median age | 48.3 years · higher than 77% of Maryland ZIP codes |
| Men / women | 44% / 56% |
| Median household income | $241,250 · higher than 98% of Maryland ZIP codes |
| Income per person | $72,952 |
| Below the poverty line | 0.0% |
| Bachelor’s degree or higher | 82% of adults 25+ |
| Median home value | $1,005,500 · higher than 98% of Maryland ZIP codes |
| Housing units | 232 |
| Households | 232 (2.88 people on average) |
| Owners / renters | 95% / 4.7% |
| Land area | 3.61 sq mi (plus 0.03 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 21723. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21723
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21794 | West Friendship, MD | 2.8 mi SE | Standard |
| 21738 | Glenwood, MD | 2.9 mi S | Standard |
| 21797 | Woodbine, MD | 3.6 mi NW | Standard |
| 21765 | Lisbon, MD | 3.8 mi W | PO Box only |
| 21737 | Glenelg, MD | 4.7 mi S | Standard |
| 21104 | Marriottsville, MD | 5 mi E | Standard |
| 21036 | Dayton, MD | 6 mi S | Standard |
| 21041 | Ellicott City, MD | 6.8 mi SE | PO Box only |
| 21150 | Simpsonville, MD | 6.8 mi SE | PO Box only |
| 21029 | Clarksville, MD | 8 mi S | Standard |
| 21042 | Ellicott City, MD | 8.4 mi SE | Standard |
| 21163 | Woodstock, MD | 8.8 mi E | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21723 or measure the distance to another ZIP code.
How to address mail to 21723
123 MAIN ST
COOKSVILLE MD 21723
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (21723-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 21723?
- 21723 is a Cooksville, Maryland ZIP code.
- What county is 21723 in?
- ZIP code 21723 is in Howard County, Maryland.
- What time zone is ZIP code 21723 in?
- 21723 is in the Eastern Time zone (America/New_York).
- What area code is 21723?
- Phone numbers in ZIP code 21723 use area codes 410, 443 and 667.
- What is the population of ZIP code 21723?
- About 669 people live in ZIP code 21723, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 21723?
- The median household income in 21723 is $241,250 a year, higher than 98% of Maryland ZIP codes.
- What ZIP codes are near 21723?
- The nearest ZIP codes to 21723 are 21794 (West Friendship, 2.8 miles), 21738 (Glenwood, 2.9 miles), 21797 (Woodbine, 3.6 miles) and 21765 (Lisbon, 3.8 miles).