In the United States, the number 240 is most famously utilized as a major regional telephone area code serving the state of Maryland, specifically covering heavily populated suburban counties surrounding Washington, D.C., such as Montgomery, Prince George's, Frederick, and parts of Charles County. Established as an overlay code for the 301 area code region, 240 handles millions of mobile, residential, and commercial telephone lines. Outside of telecommunications, 240 does not serve as a statewide legal or geographic identifier, though various local municipal ordinances or state-specific certification programs (like Texas alternative education fees) occasionally reference 240 in administrative contexts.
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