Area code 410 officially entered service on October 6, 1991; it was initially implemented in permissive-dialing mode, not as a flash-cut, with the 10-digit dialing scheme coming in for local calls across the new 301/410 boundary. The split largely followed metro lines. However, slivers of Anne Arundel and Carroll counties, as well as much of western Howard County, stayed in 301 even though these counties reckoned as part of the Baltimore area. Conversely, slivers of Frederick County, a Washington exurb, switched to 410. Effective November 1, 1991, ten-digit dialing was required when calling a different area code in Maryland
.: Material: water-resistant vinyl
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.: Easy peel backing
.: Matte finish
.: NB! Small details close to each other will most likely be cut out as one shape