ZIP code · Solomons · Maryland · United States

ZIP code 20688 — Solomons

ZIP code 20688 serves Solomons, Maryland.

Postal code
20688
Single source Value from one source, not cross-checked.
City
Solomons
County
Calvert FIPS 24009
State
Maryland
Country
United States
Coordinates
38.3293, -76.4651 — precision precise (locality)
View on OpenStreetMap
Population
1,113 (ZCTA, ACS 5-year)
Population density
967 / sq mi
Land area
1.2 sq mi (3 km²) (ZCTA, ACS 5-year)
Median household income
$88,902
Per-capita income
$55,056
Median age
72.1
Households
637
Housing units
726
Median gross rent
$3,000 / month
Congressional district
MD-5 (119th Congress)
USDA hardiness zone
8a (10 to 15 °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)
Area codes
410, 667, 443
Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.

Climate — monthly normals

Warmest month Jul (avg high 88°F), coldest Jan (avg low 30°F).

JanFebMarAprMayJunJulAugSepOctNovDec
Avg high °F454855657484888680695950
Avg low °F303138475868737165534335

NOAA 1991–2020 climate normals from the nearest station: SOLOMONS (0.9 mi) · NOAA NCEI

Places in ZIP 20688

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