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  1. Area codes 303 and 720 are telephone area codes in the North American Numbering Plan for the north-central portion of the U.S. state of Colorado. The numbering plan area comprises Denver and Boulder, as well as their surrounding suburbs, including Lakewood, Littleton, Longmont, Aurora, and Castle Rock. Area code 303 is the original area code, while area code 720 was added to form an overlay plan for the area, meaning that the same geographic service area is served by both area codes and that... Read More

    Area codes 303 and 720 - Wikipedia

    https://en.wikipedia.org/wiki/Area_codes_303_and_720
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  3. Area code 303 serves the state of Colorado. This area code was assigned on January 1st, 1947. On January 1st, 1947 it went into service. 303 is a General Purpose Code. 303 service area does overlap with 720 area codes.

    • Colorado
    • Mountain (GMT -07:00)
  4. Oct 09, 2021 · 303 is an area code located in the state of Colorado, US. The largest city it serves is Denver. Location, time zone and map of the 303 area code

    • UTC/GMT -6:00 hours
    • MDT
    • UTC/GMT -7:00 hours
  5. State: Colorado. Number Format: (303) xxx-xxxx. International Number Format: +1 303 xxxxxxx. Major city: Denver. Time Zone: MST (UTC-07:00) / MDT (UTC-06:00) Then check it here! Learn which area is covered under the code 303, along with the service provider that works with this code.

    Prefix
    Primary City
    Company
    Usage
    Teleport Communications America
    Landline
    Usa Mobility Wireless
    Cell Number
    Qwest Corporation
    Landline
    American Messaging (am)
    Cell Number
  6. Area Code 303 is in Colorado and covers 6697.11 square miles. Area Code 303 contains 209 non-unique postal area zip codes. Metro Area.

    Zip Code
    Postal City
    County
    Metro Area
    Greeley, CO
    Denver-Aurora, CO
    Denver-Aurora, CO
    Denver-Aurora, CO
    • 6697.11 sqm / 10778 sqkm
    • 4M
    • MDT
    • Mountain Daylight Time
  7. Area codes 303 and 720 are telephone area codes in the North American Numbering Plan for the north-central portion of the U.S. state of Colorado. The numbering plan area comprises Denver and Boulder, as well as their surrounding suburbs, including Lakewood, Littleton, Longmont, Aurora, and Castle Rock. Area code 303 is the original area code, while area code 720 was added to form an overlay plan for the area, meaning that the same geographic service area is served by both area codes and that ...

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