ZIP code · Thurmont · Maryland · United States
ZIP code 21788 — Thurmont
ZIP code 21788 serves Thurmont, Maryland.
- Postal code
- 21788Single source Value from one source, not cross-checked.
- City
- Thurmont
- County
- Frederick FIPS 24021
- State
- Maryland
- Country
- United States
- Coordinates
- 39.6109, -77.3989 — precision precise (locality)
View on OpenStreetMap - Population
- 11,919 (ZCTA, ACS 5-year)
- Population density
- 182 / sq mi
- Land area
- 65.4 sq mi (169.5 km²) (ZCTA, ACS 5-year)
- Median household income
- $93,717
- Per-capita income
- $50,992
- Median age
- 46.5
- Households
- 4,821
- Housing units
- 5,102
- Median home value
- $342,700
- Median gross rent
- $1,015 / month
- Congressional district
- MD-6 (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 21788 with another ZIP · ZIPs within 25 miles · distance from 21788
Map of ZIP code 21788
Climate — monthly normals
Warmest month Jul (avg high 84°F), coldest Jan (avg low 23°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 39 | 42 | 52 | 65 | 73 | 80 | 84 | 81 | 75 | 65 | 54 | 43 |
| Avg low °F | 23 | 25 | 31 | 42 | 52 | 60 | 65 | 63 | 58 | 46 | 36 | 28 |
| Precip in | 3.8 | 3.0 | 4.4 | 4.0 | 4.9 | 4.2 | 3.7 | 4.0 | 5.3 | 4.1 | 3.7 | 3.5 |
NOAA 1991–2020 climate normals from the nearest station: CATOCTIN MTN PARK (5.1 mi) · NOAA NCEI
Places in ZIP 21788
- 9 schools
- 4 doctors & dentists
- 2 pharmacies
- 2 supermarkets
- 12 restaurants & cafés
- 1 bars & pubs
- 15 parks
- 11 playgrounds
- 4 gyms & sports centres
- 1 libraries
- 3 post offices
- 18 places of worship
- 2 banks
- 10 gas stations
- 2 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