List of counties in Maryland

There are twenty-three counties and Baltimore City in the U.S. state of Maryland. Though an independent city rather than a county, the City of Baltimore by some is considered the equal of a county for most purposes and is a county-equivalent. 

Alphabetical listing

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 Map 

 Former counties 
CountyYears of existenceEtymologyOld Charles County1650–1654Charles I, King of EnglandDurham County1669–1672The English County DurhamOld Worcester County1672–1685Mary Arundell, the wife of Sir John Somerset, son of the 1st Marquess of Worcester,and sister of Anne Arundell, wife of Cæcilius Calvert, 2nd Baron Baltimore

 References 

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Maryland