Residential delivery area · Maryland
ZIP Code 21158: Westminster, MD
ZIP code 21158 uses the postal name Westminster, Maryland and lies entirely in Carroll County (Census 2020 ZIP-county file). About 22,000 people live there (Census Bureau, ACS 2020-2024), the less populous of Westminster's 2 residential ZIP codes. Median household income is $109,827 (Census Bureau, ACS 2020-2024). By Census place, 5% of its land lies in Westminster; 96% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Westminster · 2 residential ZIPs
- County
- Carroll County
- Census places
- Westminster
- Neighborhoods
- Avondale Ridge, Avondale Run, Carroll Lutheran Village, Furnace Hills, The Fairways at Wakefield, Wakefield Valley and 1 more GeoNames
- Metro area
- Baltimore-Columbia-Towson, MD
- House district
- MD-2 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 73.3 sq mi · 301 people per sq mi
Where is ZIP code 21158?
21158 centers on 39.654°, -77.035° and covers 73.3 square miles of land plus 0.2 of water. It borders 7 ZIP codes: 21787, 21157, 17340, 17331, 21776, 21102, 21791.
The map draws ZIP code areas only. For the streets inside 21158, 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 21158 compare with the rest of Westminster?
| Measure | 21158 | In Westminster | In Carroll County | In MD |
|---|---|---|---|---|
| People (ACS 2020-2024) | 22,083 | 2nd of 2 | 5th of 15 | 117th of 477 |
| Median household income | $110k | 1st of 2 | 10th of 15 | 148th of 293 |
| Median home value | $385k | 2nd of 2 | 12th of 15 | 196th of 320 |
Its median household income is higher than in 87% of U.S. residential ZIP codes, and it is denser than 67% 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 21158?
The 2020 Census counted 20,917 people in 21158; the ACS, which samples households over 2020-2024, estimates 22,083. Between the 2010 and 2020 censuses its population grew 3.4% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 22,083
- 2020 Census count
- 20,917+3.4% since 2010 (20,234)
- Households
- 8,451
- Median age
- 41.6
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 21158?
Of the 22,083 people the ACS estimates in 21158, 21.2% are under 18 and 19.0% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (84.5%).
- Under 1821.2%
- 18 to 6459.8%
- 65 and older19.0%
- White, not Hispanic84.5%
- Black, not Hispanic4.9%
- Hispanic or Latino4.4%
- Other or two or more3.7%
- Asian, not Hispanic2.5%
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 21158 earn?
Median household income is $109,827 (ACS 2020-2024), the 10th highest of the 15 ranked ZIP codes in Carroll County. It is not measurably different from 2015-2019 ($115,228 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $109,827
- Income per person
- $52,759
- Below the poverty line
- 6.2%
- Unemployed (of the labor force)
- 3.5%
- Adults 25+ with a bachelor's degree
- 36.1%
- Adjusted gross income per tax return, 2022
- $92,13310,610 returns; wages 72% 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 21158?
FHFA's house price index for 21158, built from repeat sales and appraisals of the same homes, rose 59% from 2015 to 2025 and rose 35% from 2020 to 2025, and moved −2.3% in 2025.
- Median home value (owners' estimate)
- $384,700
- Median gross rent
- $1,794
- Homes owned by their occupants
- 79.2%
- Housing units
- 8,768
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 21158?
282 business establishments had a location in this ZIP code in 2023, 12 fewer than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction61
- Professional, scientific, and technical services37
- Health care and social assistance34
- Other services (except public administration)28
- Administrative and support and waste management and remediation services24
- Accommodation and food services16
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 21158?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21787 | Taneytown | 11,645 | $92k | 7.5 mi |
| 21157 | Westminster | 38,984 | $105k | 7.8 mi |
| 17340 | Littlestown, PA | 11,405 | $90k | 8.2 mi |
| 17331 | Hanover, PA | 56,443 | $80k | 9.9 mi |
| 21776 | New Windsor | 6,261 | $133k | 10.0 mi |
| 21102 | Manchester | 12,162 | $135k | 10.3 mi |
| 21791 | Union Bridge | 5,340 | $93k | 11.7 mi |
| 17344 | McSherrystown, PA | 3,719 | $66k | 10.5 mi (near) |
| 21074 | Hampstead | 14,777 | $109k | 10.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.