Residential delivery area · Maryland
ZIP Code 21157: Westminster, MD
ZIP code 21157 uses the postal name Westminster, Maryland and lies entirely in Carroll County (Census 2020 ZIP-county file). About 39,000 people live there (Census Bureau, ACS 2020-2024), the more populous of Westminster's 2 residential ZIP codes. Median household income is $104,966 (Census Bureau, ACS 2020-2024). Its land lies mostly outside any Census place; 4% is in small places.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Westminster · 2 residential ZIPs
- County
- Carroll County
- Neighborhoods
- Belle Grove Square, Carroll Meadows, Marbeth Hill, Middle Brooke, Parrs Ridge, Spring Mills, Westminster and 1 more GeoNames
- Metro area
- Baltimore-Columbia-Towson, MD
- House district
- MD-2 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 77.7 sq mi · 502 people per sq mi
Where is ZIP code 21157?
21157 centers on 39.549°, -76.984° and covers 77.7 square miles of land plus 0.2 of water. It borders 8 ZIP codes: 21048, 21776, 21158, 21074, 21784, 21102, 21771, 21797.
The map draws ZIP code areas only. For the streets inside 21157, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0); neighborhoods from the GeoNames gazetteer (CC BY 4.0), placed in this ZIP code by PlainZIP.
How does 21157 compare with the rest of Westminster?
| Measure | 21157 | In Westminster | In Carroll County | In MD |
|---|---|---|---|---|
| People (ACS 2020-2024) | 38,984 | 1st of 2 | 2nd of 15 | 47th of 477 |
| Median household income | $105k | 2nd of 2 | 12th of 15 | 160th of 293 |
| Median home value | $424k | 1st of 2 | 9th of 15 | 166th of 320 |
Its median household income is higher than in 84% of U.S. residential ZIP codes, and it is denser than 72% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 21157?
The 2020 Census counted 38,584 people in 21157; the ACS, which samples households over 2020-2024, estimates 38,984. Between the 2010 and 2020 censuses its population grew 4.5% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 38,984
- 2020 Census count
- 38,584+4.5% since 2010 (36,920)
- Households
- 14,785
- Median age
- 43.2
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 21157?
Of the 38,984 people the ACS estimates in 21157, 19.2% are under 18 and 19.5% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (84.6%).
- Under 1819.2%
- 18 to 6461.3%
- 65 and older19.5%
- White, not Hispanic84.6%
- Hispanic or Latino6.5%
- Black, not Hispanic3.9%
- Other or two or more3.8%
- Asian, not Hispanic1.3%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 21157 earn?
Median household income is $104,966 (ACS 2020-2024), the 12th highest of the 15 ranked ZIP codes in Carroll County. It is not measurably different from 2015-2019 ($103,428 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $104,966
- Income per person
- $49,793
- Below the poverty line
- 6.7%
- Unemployed (of the labor force)
- 4.1%
- Adults 25+ with a bachelor's degree
- 37.9%
- Adjusted gross income per tax return, 2022
- $91,18318,660 returns; wages 73% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 21157?
FHFA's house price index for 21157, built from repeat sales and appraisals of the same homes, rose 62% from 2015 to 2025 and rose 42% from 2020 to 2025, and moved +0.7% in 2025.
- Median home value (owners' estimate)
- $424,100
- Median gross rent
- $1,331
- Homes owned by their occupants
- 76.8%
- Housing units
- 15,471
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 21157?
1,303 business establishments had a location in this ZIP code in 2023, 13 fewer than in 2018; the most are in health care and social assistance (ZIP Code Business Patterns).
- Health care and social assistance210
- Retail trade161
- Other services (except public administration)156
- Professional, scientific, and technical services153
- Construction150
- Accommodation and food services92
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 21157?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21048 | Finksburg | 10,481 | $132k | 4.6 mi |
| 21776 | New Windsor | 6,261 | $133k | 6.5 mi |
| 21158 | Westminster | 22,083 | $110k | 7.8 mi |
| 21074 | Hampstead | 14,777 | $109k | 9.2 mi |
| 21784 | Sykesville | 39,258 | $139k | 10.2 mi |
| 21102 | Manchester | 12,162 | $135k | 12.3 mi |
| 21771 | Mount Airy | 33,031 | $157k | 14.1 mi |
| 21797 | Woodbine | 8,643 | $189k | 15.7 mi |
| 21155 | Upperco | 3,313 | $123k | 9.6 mi (near) |
| 21071 | Glyndon | 404 | $214k | 10.3 mi (near) |
| 21136 | Reisterstown | 32,088 | $119k | 10.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.