The 986 area code belongs to the state of Idaho (ID) and some of the locations covered are Caldwell, Nampa and more:
|State||Larger cities in area code 986||Time Zone|
|Blackfoot, Boise, Caldwell, Coeur D'Alene, Eagle, Idaho Falls, Lewiston, Meridian, Moscow, Nampa, Pocatello, Post Falls, Rexburg, Twin Falls
Current time is
|-- overlays area code 208 --|
From 1947 to 2017 Idaho had just one area code: 208. As of September 5, 2017 the new 986 area code overlays NPA 208, also covering the whole state of Idaho. Consequently, locals calls within the new overlay complex' borders are now dialed using 10 digits.
See official NANPA announcement (PDF document)