Zip Code 21042
Ellicott City, Maryland — Howard County
📍 ZIP code 21042 is in Ellicott City, Howard County, Maryland.
ZIP code 21042 is located in Ellicott City, Howard County, Maryland. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 43,021. The area code for ZIP code 21042 is 301.
Quick Answer
Zip code 21042 is in Ellicott City, Maryland (Howard County). It has a population of 43,021, median household income of $190,504, and median home value of $674,700.
Population
43,021
Income
$190,504
Home Value
$674,700
Climate
89°F / 26°F
About Zip Code 21042
Zip code 21042 is located in Ellicott City, Maryland, within Howard County. Home to approximately 43,021 residents, this area sits at an elevation of 500 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 301.
The median household income is $190,504 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $674,700, and the cost of living index is 235 (135% above the national average of 100).
Summers average a high of 89°F while winters drop to 26°F. The area receives about 48 in of rain and 9 in of snow annually. The zip code covers 37.5 square miles of land area and 0.2 square miles of water.
Key Statistics
43,021
$190,504
$674,700
Eastern (EST/EDT)
301
500 ft
37.5 sq mi
45
15,269
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Compare With Nearby Zip Codes
| Metric | 21042 | 21794 | 21163 | 21104 | 21044 | 21043 |
|---|---|---|---|---|---|---|
| City | Ellicott City, MD | Sykesville, MD | Randallstown, MD | Randallstown, MD | Columbia, MD | Ellicott City, MD |
| Population | 43,021 | 2,326 | 7,031 | 5,786 | 44,775 | 47,134 |
| Median Income | $190,504 | $223,833 | $131,154 | $199,803 | $132,924 | $141,846 |
| Home Value | $674,700 | $977,200 | $598,700 | $659,700 | $541,100 | $607,300 |
| Cost of Living | 235 | 250 | 186 | 245 | 176 | 202 |
| Median Age | 45 | 42.2 | 46.7 | 46 | 39.9 | 39.4 |
Cost of Living
100 = National Average. Ellicott City's cost of living is 135% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
3.5x
Demographics
Zip code 21042 has a population of 43,021 people with a median age of 45. There are 15,269 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Ellicott City (21042) population trend from 2010 to 2024
↑ 54.2%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
89°F
26°F
48 in
9 in
Ellicott City experiences warm summers with average highs around 89°F. Winters are cool with lows averaging 26°F. The area receives about 9 in of snow per year.
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Housing & Economy
Median Home Value
$674,700
Median Household Income
$190,504
With 15,269 housing units across 37.5 square miles, 21042 has a housing density of 407 units per square mile. The home price-to-income ratio is 3.5x.
Location & Geography
Latitude
39.2772°
Longitude
-76.8946°
Land Area
37.5 sq mi
Water Area
0.2 sq mi
Nearby Zip Codes
Zip codes closest to 21042 (Ellicott City, MD) with distances:
All Zip Codes in Ellicott City, MD
Other zip codes serving Ellicott City:
Related Cities in Maryland
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ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 21042's $190,504. A way to compare Ellicott City to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 21042 (Ellicott City, MD). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Ellicott City, Maryland?
Ellicott City, Maryland uses zip code 21042 along with 1 other zip codes.
What county is zip code 21042 in?
Zip code 21042 is located in Howard County, Maryland.
What is the population of zip code 21042?
The population of zip code 21042 is 43,021 with a median age of 45.
Is 21042 in Ellicott City, Maryland?
Yes, zip code 21042 is in Ellicott City, Howard County, Maryland. The area code is 301.
Frequently Asked Questions
What city is zip code 21042 in?
Zip code 21042 is in Ellicott City, Maryland. It is part of Howard County and uses the Eastern (EST/EDT) timezone.
What is zip code 21042?
Zip code 21042 is a U.S. postal code in Ellicott City, Maryland (Howard County). It has a population of 43,021 and covers 37.5 square miles.
What is the population of zip code 21042?
The population of zip code 21042 (Ellicott City, MD) is 43,021 with a median age of 45. There are approximately 15,269 housing units in this area.
What is the median income in zip code 21042?
The median household income in zip code 21042 (Ellicott City, MD) is $190,504 per year. The cost of living index is 235 (100 = national average).
What is the average home price in zip code 21042?
The median home value in zip code 21042 (Ellicott City, MD) is $674,700. The cost of living index is 235 compared to the national average of 100.
What county is zip code 21042 in?
Zip code 21042 is located in Howard County, Maryland. The primary city is Ellicott City.
What is the area code for zip code 21042?
Zip code 21042 in Ellicott City, MD uses area code 301. It is located in the Eastern (EST/EDT) timezone.
Is zip code 21042 a good place to live?
Zip code 21042 (Ellicott City, MD) has a cost of living index of 235 (100 = national average), a median household income of $190,504, and median home values of $674,700. The median age is 45. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 21042?
The cost of living index for zip code 21042 (Ellicott City, MD) is 235, where 100 represents the national average. This area is above the national average. Median home value: $674,700.
What schools serve zip code 21042?
Zip code 21042 in Ellicott City, Maryland is served by the local school district of Howard County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.