ZIP code 21045
Where is ZIP code 21045?
Columbia, Maryland
Howard County · Standard ZIP code
ZIP code 21045 belongs to Columbia, Maryland in Howard County. 21045 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 40,034 people live in the 21045 area, where the median household income is $118,563. The closest ZIP codes are 21044 (Columbia, 2.6 mi west), 21046 (Columbia, 2.7 mi southwest) and 21043 (Ellicott City, 3.8 mi northeast).
| ZIP code | 21045 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Columbia |
| State | Maryland (MD) |
| County | Howard County |
| Time zone | Eastern Time · now |
| Area codes | 410, 443, 667 |
| Coordinates | 39.2051, -76.8322 map |
| 3-digit prefix | 210 |
Population and income in 21045
| Population | 40,034 · higher than 91% of Maryland ZIP codes |
|---|---|
| People per square mile | 4,128 · higher than 87% of Maryland ZIP codes |
| Median age | 39.6 years · lower than 64% of Maryland ZIP codes |
| Men / women | 48% / 52% |
| Median household income | $118,563 · higher than 60% of Maryland ZIP codes |
| Income per person | $56,185 |
| Below the poverty line | 8.6% |
| Bachelor’s degree or higher | 57% of adults 25+ |
| Median home value | $453,700 · higher than 59% of Maryland ZIP codes |
| Median rent | $1,777 a month |
| Housing units | 15,780 |
| Households | 15,414 (2.59 people on average) |
| Owners / renters | 68% / 32% |
| Land area | 9.7 sq mi (plus 0.09 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 21045. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21045
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21044 | Columbia, MD | 2.6 mi W | Standard |
| 21046 | Columbia, MD | 2.7 mi SW | Standard |
| 21043 | Ellicott City, MD | 3.8 mi NE | Standard |
| 21075 | Elkridge, MD | 4.2 mi E | Standard |
| 20794 | Jessup, MD | 4.5 mi SE | Standard |
| 20763 | Savage, MD | 4.7 mi S | Standard |
| 20723 | Laurel, MD | 4.9 mi SW | Standard |
| 21042 | Ellicott City, MD | 4.9 mi N | Standard |
| 20701 | Annapolis Junction, MD | 5.3 mi S | Standard |
| 21041 | Ellicott City, MD | 6.3 mi W | PO Box only |
| 21150 | Simpsonville, MD | 6.3 mi W | PO Box only |
| 21029 | Clarksville, MD | 6.4 mi W | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21045 or measure the distance to another ZIP code.
How to address mail to 21045
123 MAIN ST
COLUMBIA MD 21045
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (21045-XXXX) helps mail sort faster but isn’t required.
Other ZIP codes in Columbia, MD
All Columbia ZIP codes with population and income →
Questions
- What city is ZIP code 21045?
- 21045 is a Columbia, Maryland ZIP code.
- What county is 21045 in?
- ZIP code 21045 is in Howard County, Maryland.
- What time zone is ZIP code 21045 in?
- 21045 is in the Eastern Time zone (America/New_York).
- What area code is 21045?
- Phone numbers in ZIP code 21045 use area codes 410, 443 and 667.
- What is the population of ZIP code 21045?
- About 40,034 people live in ZIP code 21045, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 21045?
- The median household income in 21045 is $118,563 a year, higher than 60% of Maryland ZIP codes.
- What ZIP codes are near 21045?
- The nearest ZIP codes to 21045 are 21044 (Columbia, 2.6 miles), 21046 (Columbia, 2.7 miles), 21043 (Ellicott City, 3.8 miles) and 21075 (Elkridge, 4.2 miles).