ZIP code 21920
Where is ZIP code 21920?
Elk Mills, Maryland
Cecil County · PO Box only ZIP code
ZIP code 21920 belongs to Elk Mills, Maryland in Cecil County. 21920 is a PO Box only ZIP code: it is used for post office boxes at the Elk Mills post office, not for street addresses. It is in the Eastern Time zone and uses area codes 410, 443 and 667. About 1,413 people live in the 21920 area, where the median household income is $124,146. The closest ZIP codes are 21921 (Elkton, 2.4 mi southwest), 21916 (Childs, 2.4 mi west) and 21922 (Elkton, 3.5 mi south).
| ZIP code | 21920 |
|---|---|
| Type | PO Box only (no street delivery) |
| Status | Active |
| City | Elk Mills |
| State | Maryland (MD) |
| County | Cecil County |
| Time zone | Eastern Time · now |
| Area codes | 410, 443, 667 |
| Coordinates | 39.658, -75.8282 map |
| 3-digit prefix | 219 |
Population and income in 21920
| Population | 1,413 · lower than 70% of Maryland ZIP codes |
|---|---|
| People per square mile | 1,429 · higher than 70% of Maryland ZIP codes |
| Median age | 36.7 years · lower than 80% of Maryland ZIP codes |
| Men / women | 47% / 53% |
| Median household income | $124,146 · higher than 65% of Maryland ZIP codes |
| Income per person | $34,843 |
| Below the poverty line | 10% |
| Bachelor’s degree or higher | 22% of adults 25+ |
| Median home value | $356,000 · lower than 65% of Maryland ZIP codes |
| Median rent | $1,346 a month |
| Housing units | 436 |
| Households | 436 (3.24 people on average) |
| Owners / renters | 65% / 35% |
| Land area | 0.99 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 21920. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21920
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21921 | Elkton, MD | 2.4 mi SW | Standard |
| 21916 | Childs, MD | 2.4 mi W | PO Box only |
| 21922 | Elkton, MD | 3.5 mi S | PO Box only |
| 19716 | Newark, DE | 4.3 mi NE | Standard |
| 19717 | Newark, DE | 4.5 mi NE | Standard |
| 19351 | Lewisville, PA | 5.1 mi NW | PO Box only |
| 19360 | New London, PA | 5.2 mi NE | PO Box only |
| 19711 | Newark, DE | 5.7 mi NE | Standard |
| 19713 | Newark, DE | 6.1 mi E | Standard |
| 19347 | Kemblesville, PA | 6.3 mi N | PO Box only |
| 19702 | Newark, DE | 7 mi E | Standard |
| 21901 | North East, MD | 7.6 mi SW | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21920 or measure the distance to another ZIP code.
How to address mail to 21920
PO BOX 123
ELK MILLS MD 21920
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (21920-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 21920?
- 21920 is a Elk Mills, Maryland ZIP code.
- What county is 21920 in?
- ZIP code 21920 is in Cecil County, Maryland.
- What time zone is ZIP code 21920 in?
- 21920 is in the Eastern Time zone (America/New_York).
- What area code is 21920?
- Phone numbers in ZIP code 21920 use area codes 410, 443 and 667.
- What is the population of ZIP code 21920?
- About 1,413 people live in ZIP code 21920, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 21920?
- The median household income in 21920 is $124,146 a year, higher than 65% of Maryland ZIP codes.
- Can I use 21920 for a street address?
- No. 21920 is only for PO Boxes. Street addresses in Elk Mills use another ZIP code.
- What ZIP codes are near 21920?
- The nearest ZIP codes to 21920 are 21921 (Elkton, 2.4 miles), 21916 (Childs, 2.4 miles), 21922 (Elkton, 3.5 miles) and 19716 (Newark, 4.3 miles).