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Area code 406 is the telephone area code in the North American Numbering Plan for the entire U.S. state of Montana. It has been Montana's only area code since the American Telephone and Telegraph Company created a nationwide telephone numbering plan in 1947.
Lists of United States area codes This page was last edited on 10 April 2015, at 20:25 (UTC) . Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ; additional terms may apply.
2023: returned to the pool of area codes available for future area code relief; 457: Louisiana (Shreveport–Bossier City, Monroe, Alexandria, Fisher, Tallulah, and most of northern Louisiana) September 25, 2025 [3] to be overlaid on 318; previously a fictitious area code assigned to identify Naked DSL/Dry Loop and dedicated data lines in ...
Initially, area codes with the middle digit 0 were assigned to numbering plan areas that comprised an entire state or province, while jurisdictions with multiple numbering plan areas received area codes having 1 as the second digit. As network growth could not be predicted accurately over more than a few years, this pattern was abandoned by ...
Pages in category "Area codes in Montana" This category contains only the following page. This list may not reflect recent changes. 0–9. Area code 406
Area code: 406: FIPS code: 30-20800: GNIS feature ID: ... Climate data for Dillon, Montana (University of Montana Western), 1991–2020 normals, extremes 1895–present
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Area code: 406: FIPS code: 30-24850: GNIS feature ID: ... Climate data for Eureka, Montana (Eureka Ranger Station), 1991–2020 normals, extremes 1960–present Month