Area Code Atlas

316 Numbering Plan Area (NPA) Split, Creating 620 NPA (Kansas)

Area code 620 split from 316

On February 3, 2001, most of southern Kansas was split from area code 316 to form the new area code 620. Area code 316 was reduced to cover only the Wichita metropolitan area, while 620 took over the rest of southern Kansas, creating a 'doughnut' configuration with 316 surrounded by 620.

Mandatory dialing of area code 620 in southern Kansas

On November 2, 2001, permissive dialing ended and mandatory use of area code 620 began for calls in the affected region. This marked the completion of the transition from area code 316 to 620 for most of southern Kansas.

Permissive dialing period ends for 316 and 620

Permissive dialing of area code 316 across southern Kansas ended on November 3, 2001. After this date, callers were required to use the correct area code, either 316 for Wichita or 620 for the rest of southern Kansas.

Permissive dialing period for 316 and 620 ends

Permissive dialing allowing calls to be completed using the old 316 area code across southern Kansas continued until November 3, 2001, after which ten-digit dialing became mandatory.

Transition to ten-digit dialing due to 988 National Suicide Prevention Lifeline

Area code 620 transitioned to mandatory ten-digit dialing by October 24, 2021, due to the designation of 988 as the National Suicide Prevention Lifeline dialing code, which conflicted with existing seven-digit dialing in the area. This change was required to resolve conflicts with existing seven-digit dialing in the area.