Home > MD > St. Mary's County > Mechanicsville > Zip 20659

Zip Code 20659 — Mechanicsville, MD

20659 is a ZIP Code associated with Mechanicsville, MD, located within St. Mary's. The postal region supports an estimated population of 24,324 residents across Data Pending housing units, with a population density of 96.8 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (38.418860, -76.732380)

Data MetricLocal Statistic
Postal / Zip Code20659
Primary CityMechanicsville
State / ProvinceMD
CountySt. Mary's
Total Population24,324
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density96.8 people/sq mi
TimezoneAmerica/New_York

How 20659 Compares

MetricZIP 20659St. Mary's CountyMD State Average
Population24,324113,4806,205,597
Median IncomeData PendingN/AN/A
Population Density96.8 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 20660Morganza3.7 mi14N/A
Zip 20624Clements5.8 mi796N/A
Zip 20656Loveville6.2 mi87N/A
Zip 20622Charlotte Hall6.5 mi5,185N/A
Zip 20612Benedict6.8 mi148N/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 →