Cardiff, Maryland

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Cardiff is a small, unincorporated community in Harford County, Maryland, with the ZIP code 21160. It sits on the Maryland–Pennsylvania border (the Mason–Dixon line) and borders Delta, Pennsylvania. Main Street runs from Whiteford to the Pennsylvania border, and Dooley Road leads from Main Street toward Route 165. The town has a post office, several shops and garages, churches, a fire hall, a general store, and a new supermarket.

The area sits in a slate-rich region and was once the mining center of Harford County. Most mines and quarries have closed, so Cardiff is now mainly focused on farming. A notable local industry was the Cardiff Marble Company, known for its green serpentine marble, or “Green Marble.” The quarry expanded after a 1913 discovery and produced decorative stone used in buildings such as the Empire State Building and various government structures in Harrisburg, York, and Washington, D.C.

Slate Ridge Elementary School, once part of Cardiff, closed in the early 1980s and is now apartments. Cardiff is part of the Whiteford–Cardiff Historic District, a National Register of Historic Places site since 2005, recognized for its Welsh heritage, distinctive architecture, and a nearby Welsh-language choir.