ZIP code · Westminster · Maryland · United States
ZIP code 21157 — Westminster
ZIP code 21157 serves Westminster, Maryland.
- Postal code
- 21157Single source Value from one source, not cross-checked.
- City
- Westminster
- County
- Carroll FIPS 24013
- State
- Maryland
- Country
- United States
- Coordinates
- 39.5642, -76.9807 — precision precise (locality)
View on OpenStreetMap - Population
- 40,191 (ZCTA, ACS 5-year)
- Population density
- 517 / sq mi
- Land area
- 77.7 sq mi (201.2 km²) (ZCTA, ACS 5-year)
- Median household income
- $102,835
- Per-capita income
- $46,732
- Median age
- 41.8
- Households
- 14,646
- Housing units
- 15,466
- Median home value
- $394,100
- Median gross rent
- $1,236 / month
- Congressional district
- MD-2 (119th Congress)
- USDA hardiness zone
- 7a (0 to 5 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/New_York (UTC−5 / UTC−4 DST)
Tools: compare 21157 with another ZIP · ZIPs within 25 miles · distance from 21157
Map of ZIP code 21157
Climate — monthly normals
Warmest month Jul (avg high 85°F), coldest Jan (avg low 24°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 43 | 52 | 65 | 73 | 81 | 85 | 83 | 77 | 65 | 54 | 44 |
| Avg low °F | 24 | 25 | 32 | 42 | 51 | 60 | 64 | 63 | 56 | 45 | 36 | 28 |
| Precip in | 3.6 | 2.9 | 4.1 | 3.8 | 4.0 | 3.8 | 4.7 | 4.2 | 5.1 | 4.2 | 3.4 | 4.0 |
NOAA 1991–2020 climate normals from the nearest station: MILLERS 4 NE (14.3 mi) · NOAA NCEI
Places in ZIP 21157
- 20 schools
- 2 colleges & universities
- 3 hospitals & clinics
- 3 doctors & dentists
- 1 pharmacies
- 8 supermarkets
- 71 restaurants & cafés
- 1 bars & pubs
- 22 parks
- 23 playgrounds
- 6 gyms & sports centres
- 4 libraries
- 2 post offices
- 33 places of worship
- 12 banks
- 15 gas stations
- 1 EV charging stations
- 4 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page