Denver could get a new area code by 2023 due to population growth | 9news.com
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Verify: Are there any 303 numbers left in Denver? | 9news.com
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Governor Jared Polis on Twitter: "Today is 303 days (March 3), celebrating Colorado's most famous area code. 303 was established as Colorado's area code in 1947 and is the primary area code
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303, 719, and 720 Area Code: Everything about Denver area codes local phone numbers
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Ten digit dialing to start next month | News | deltacountyindependent.com
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303 area code — information, time zone, map
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303 Area Code - Location map, time zone, and phone lookup
