Zip Code 21157
Westminster, Maryland — Carroll County
📍 ZIP code 21157 is in Westminster, Carroll County, Maryland.
ZIP code 21157 is located in Westminster, Carroll County, Maryland. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 40,191. The area code for ZIP code 21157 is 410.
Quick Answer
Zip code 21157 is in Westminster, Maryland (Carroll County). It has a population of 40,191, median household income of $102,835, and median home value of $394,100.
Population
40,191
Income
$102,835
Home Value
$394,100
Climate
85°F / 24°F
About Zip Code 21157
Zip code 21157 is located in Westminster, Maryland, within Carroll County. Home to approximately 40,191 residents, this area sits at an elevation of 827 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 410.
The median household income is $102,835 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $394,100, and the cost of living index is 132 (32% above the national average of 100).
Summers average a high of 85°F while winters drop to 24°F. The area receives about 48 in of rain and 34 in of snow annually. The zip code covers 76.7 square miles of land area and 0.2 square miles of water.
Key Statistics
40,191
$102,835
$394,100
Eastern (EST/EDT)
410
827 ft
76.7 sq mi
41.8
15,466
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Compare With Nearby Zip Codes
| Metric | 21157 | 21048 | 21776 | 21158 | 21074 | 21155 |
|---|---|---|---|---|---|---|
| City | Westminster, MD | Finksburg, MD | New Windsor, MD | Westminster, MD | Hampstead, MD | Hampstead, MD |
| Population | 40,191 | 10,002 | 5,905 | 22,404 | 15,070 | 3,124 |
| Median Income | $102,835 | $122,801 | $111,923 | $108,795 | $101,462 | $124,219 |
| Home Value | $394,100 | $423,900 | $433,600 | $375,100 | $349,900 | $537,700 |
| Cost of Living | 132 | 155 | 146 | 135 | 125 | 176 |
| Median Age | 41.8 | 44.7 | 43.9 | 42.6 | 42 | 37.1 |
Cost of Living
100 = National Average. Westminster's cost of living is 32% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
3.8x
Demographics
Zip code 21157 has a population of 40,191 people with a median age of 41.8. There are 15,466 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Westminster (21157) population trend from 2010 to 2024
↓ -39.1%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
85°F
24°F
48 in
34 in
Westminster experiences warm summers with average highs around 85°F. Winters are cool with lows averaging 24°F. With 34 in of annual snowfall, residents should be prepared for significant winter weather.
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Housing & Economy
Median Home Value
$394,100
Median Household Income
$102,835
With 15,466 housing units across 76.7 square miles, 21157 has a housing density of 202 units per square mile. The home price-to-income ratio is 3.8x.
Location & Geography
Latitude
39.5486°
Longitude
-76.9836°
Land Area
76.7 sq mi
Water Area
0.2 sq mi
Nearby Zip Codes
Zip codes closest to 21157 (Westminster, MD) with distances:
All Zip Codes in Westminster, MD
Other zip codes serving Westminster:
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 21157's $102,835. A way to compare Westminster 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 21157 (Westminster, 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 Westminster, Maryland?
Westminster, Maryland uses zip code 21157 along with 1 other zip codes.
What county is zip code 21157 in?
Zip code 21157 is located in Carroll County, Maryland.
What is the population of zip code 21157?
The population of zip code 21157 is 40,191 with a median age of 41.8.
Is 21157 in Westminster, Maryland?
Yes, zip code 21157 is in Westminster, Carroll County, Maryland. The area code is 410.
Frequently Asked Questions
What city is zip code 21157 in?
Zip code 21157 is in Westminster, Maryland. It is part of Carroll County and uses the Eastern (EST/EDT) timezone.
What is zip code 21157?
Zip code 21157 is a U.S. postal code in Westminster, Maryland (Carroll County). It has a population of 40,191 and covers 76.7 square miles.
What is the population of zip code 21157?
The population of zip code 21157 (Westminster, MD) is 40,191 with a median age of 41.8. There are approximately 15,466 housing units in this area.
What is the median income in zip code 21157?
The median household income in zip code 21157 (Westminster, MD) is $102,835 per year. The cost of living index is 132 (100 = national average).
What is the average home price in zip code 21157?
The median home value in zip code 21157 (Westminster, MD) is $394,100. The cost of living index is 132 compared to the national average of 100.
What county is zip code 21157 in?
Zip code 21157 is located in Carroll County, Maryland. The primary city is Westminster.
What is the area code for zip code 21157?
Zip code 21157 in Westminster, MD uses area code 410. It is located in the Eastern (EST/EDT) timezone.
Is zip code 21157 a good place to live?
Zip code 21157 (Westminster, MD) has a cost of living index of 132 (100 = national average), a median household income of $102,835, and median home values of $394,100. The median age is 41.8. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 21157?
The cost of living index for zip code 21157 (Westminster, MD) is 132, where 100 represents the national average. This area is above the national average. Median home value: $394,100.
What schools serve zip code 21157?
Zip code 21157 in Westminster, Maryland is served by the local school district of Carroll 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.