Home > MD > St. Mary's County > Callaway > Zip 20620

Zip Code 20620 — Callaway, MD

20620 is a ZIP Code associated with Callaway, MD, located within St. Mary's. The postal region supports an estimated population of 1,115 residents across Data Pending housing units, with a population density of 100.4 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (38.232880, -76.521960)

Data Metric	Local Statistic
Postal / Zip Code	20620
Primary City	Callaway
State / Province	MD
County	St. Mary's
Total Population	1,115
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	100.4 people/sq mi
Timezone	America/New_York

How 20620 Compares

Metric	ZIP 20620	St. Mary's County	MD State Average
Population	1,115	113,480	6,205,597
Median Income	Data Pending	N/A	N/A
Population Density	100.4 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 20634	Great Mills	1.8 mi	7,088	N/A
Zip 20692	Valley Lee	3.5 mi	505	N/A
Zip 20619	California	4.1 mi	14,212	N/A
Zip 20667	Park Hall	4.3 mi	150	N/A
Zip 20653	Lexington Park	4.9 mi	26,852	N/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 →