OldMapsOnline
OldMapsOnline not only provides access to historic maps from all over the world, but also provides interactive features for overlaying maps and exploring maps in the context of historical timelines.
Patents Index
Maryland State Archives card index to certificates of survey and land patents.
PLATS.NET
PLATS.NET is a system developed by the Maryland State Archives, the Administrative Office of the Courts and Maryland Circuit Court Clerks to preserve and make accessible all plats filed with the Land Office and the Circuit Courts of Maryland. The site includes land survey, subdivision, and condominium plats
from 1658 to 2023.
Sanborn Volume Finder: Baltimore
This map can pinpoint the correct Sanborn Fire Insurance Atlas volume for any location in Baltimore, Maryland, between 1890-1953 for volumes held in the Geography & Map Division of the Library of Congress.
Sanborn Volume Finder: Washington, D.C. and Maryland Suburbs
Based on volumes held in the Geography & Map Division of the Library of Congress, this map pinpoints the correct Sanborn Fire Insurance Atlas volume for locations in Washington, D.C., and some of the surrounding suburbs in Prince George's and Montgomery Counties, Maryland. Date vary from 1916 to 1999.
Searching Maryland Historical Land Records
This video tutorial by the Maryland State Archives shows how to search for older land records through MDLANDREC.
The New Early Settlers of Maryland
The New Early Settlers of Maryland is a database of settlers named in Maryland land patent volumes and a land warrant volume from 1633-1685.