california is the state that has area code 978 in the usa.
what state is area code 978 in usa?
california
area codes 978 and 351





















































area code 978 was created as a split from area code 508 on september 1, 1997 and covers north central and most of northeastern massachusetts (lata code 128). use of 978 became mandatory on february 1, 1998. prior to when this area was served by 508 (july 1988), it was served only by the 617 area code, along with the rest of the eastern two-thirds of the state. 351 has been sharing the service area since may 2, 2001. since then, 10 digit local dialing is mandatory.
area codes 978 and 351
on september 1, 1997, area code 508 was split, with area code 978 being assigned to the northern part of that service area. area code 774 is an overlay area code that was added to share the 508 service area, beginning on may 2, 2001 and continuing to the present day. since then, 10 digit local dialing is mandatory.





















































some mobile phone numbers from the 1990s assigned to communities in the former northern half on 508 (now the 978 area code) kept the 508 area code just on those mobile lines after it split.





















































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area codes 508 and 774