Home > MD > Calvert County > Prince Frederick > Zip 20678

Zip Code 20678 — Prince Frederick, MD

20678 is a ZIP Code associated with Prince Frederick, MD, located within Calvert. The postal region supports an estimated population of 12,752 residents across Data Pending housing units, with a population density of 109.7 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (38.521640, -76.600720)

Data MetricLocal Statistic
Postal / Zip Code20678
Primary CityPrince Frederick
State / ProvinceMD
CountyCalvert
Total Population12,752
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density109.7 people/sq mi
TimezoneAmerica/New_York

How 20678 Compares

MetricZIP 20678Calvert CountyMD State Average
Population12,75292,0156,205,597
Median IncomeData PendingN/AN/A
Population Density109.7 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 20676Port Republic3.7 mi3,218N/A
Zip 20612Benedict4.3 mi148N/A
Zip 20639Huntingtown6.0 mi15,544N/A
Zip 20685Saint Leonard7.2 mi6,866N/A
Zip 20608Aquasco7.3 mi693N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →