Area Code 620 was the result of a split from 316 on February 3 2001. It covers most telephone exchanges in southern Kansas. It stretches from the Colorado state line on the west to the Missouri state line on the east, while excluding the Wichita Metropolitan Area (316). The permissive dialing period for 620 ended on November 3 2001. The largest cities covered by the area code are Dodge City, Garden City and Hutchinson.
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The boundary between area codes 620 and 785 runs from west to east roughly following a path along K-4 and K-96. The code boundary dips along I-135 in McPherson County and continues east to just north of Emporia in Lyon County along the Kansas Turnpike, where the boundaries of area codes 620, 785 and 913 meet. Area code 620 then shares its northern boundary with that of area code 913 to the Missouri state line.
All of Sedgwick County, along with parts of Butler and Harvey counties remain in area code 316.
| Kansas area codes: 316, 620, 785, 913 | ||
|---|---|---|
| North: 785, 913 | ||
| West: 719 | area code 620 completely surrounds 316 | East: 417 |
| South: 580, 539/918 | ||
| Colorado area codes: 303, 719, 720, 970 | ||
| Missouri area codes: 314, 417, 573, 636, 660, 816 | ||
| Oklahoma area codes: 405, 580, 918 | ||
