ZIP Code 21045 - Columbia Maryland

ZIP Code 21045 is located in Columbia Maryland. Portions of 21045 are also in Ellicott City. 21045 is entirely within Howard County. Regionally, it is located in Metro Baltimore.

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ZIP Code 21045 Quick Stats

ZIP Code NameColumbia
Primary CountyHoward County
ZIP Code TypeStandard
Population (2022)40,980
Area Code(s)240 / 301 / 410 / 443 / 667
Current Time

ZIP Code 21045 Map

21045 Demographics

21045 can be classified socioeconomically as Middle Class class compared to other ZIP Codes in Maryland based on Median Household Income and Average Adjusted Gross Income. The majority race/ethnicity residing in 21045 is White. The majority race/ethnicity attending public schools in 21045 is African American. The current unemployment level in 21045 is 2.8%.

Population Growth Rate1.99%
Population Density4,170 People per Square Mile
Total Households15,039
Percentage High Income Households8.7%
Median Household Income (2021)$110,111
Average Adjusted Gross Income (2020)$82,000
Current Unemployment Rate (April 2024)2.8%
Majority Race/EthnictyWhite - 47.04%
Public School Majority Race/EthnictyAfrican American - 38.60%

21045 Race/Ethnicty Breakdown

Native American3110.76%
Hawaiian/Pac. Islander00%

21045 Public School Race/Ethnicty Breakdown

Native American110.16%
Hawaiian/Pac. Islander50.07%

21045 Educational Attainment Levels

Highest Education Level AttainedTotalPercentage
Less Than 1 Year of College1,1144.47%
Bachelor Degree8,18632.84%
High School Diploma3,44513.82%
No High School Diploma2290.92%
GED or Alternate4351.74%
1 or More Years of College2,90311.64%
Associates Degree1,6966.8%
Masters Degree4,99220.02%
Professional Degree9953.99%
Doctorate Degree9353.75%

21045 Geography

Adjacent ZIP Codes
Cities/Towns in 21045
RegionMetro Baltimore
Metropolitan/Micropolitan Stat AreaBaltimore-Columbia-Towson, MD
Time ZoneEastern Daylight Time
IANA TimezoneAmerica/New_York
Area10 Square Miles

21045 Politics

US Congressional Districts in 21045
Maryland State Senate Districts in 21045
Maryland State House of Delegates Districts in 21045

21045 Weather and Climate Data

Plant Hardiness ZoneZone 7a: 0F to 5F
Average First Frost DateOctober 11 - 20
Average Last Frost DateApril 21 - 31
Koppen-Geiger Climate ZoneCfa - Humid Subtropical Climate
Ecoregion64c - Piedmont Uplands

21045 Annual Climate Data

Avg Min Temp (°F)24263342526165645745362844
Avg Max Temp (°F)42455566758387867968564666
Avg Precip (In.)3.472.974.083.374.573.763.993.754.173.493.583.4644.67

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