Area Code Atlas

NPA 248 split from 810

Area code 248 was created in 1997 as a geographic split from area code 810, serving Oakland County and parts of Wayne County in Michigan. The split was implemented to address central office code exhaustion in the region, reducing the territory of 810.

NPA 248 split from 810

Area code 248 was introduced for Oakland County, Michigan, with a permissive dialing period beginning May 10, 1997. This split relieved 810, which continued to serve surrounding areas.

NPA 947 assigned as overlay for 248

In 2000, area code 947 was assigned as an overlay for area code 248 to provide relief for central office code exhaustion in the region. This assignment introduced a new area code covering the same geographic area as 248.

NPA 947 assigned as overlay for 248

Area code 947 was assigned in 2000 as an overlay area code to provide relief for central office code exhaustion in the 248 numbering plan area.

NPA 947 overlay on 248 announced

NPA 947 to Overlay NPA 248 / NPA 679 to Overlay NPA 313 / NPA 278 to Overlay NPA 734 (Michigan)

Assignment of NPA 947 as overlay for 248

Area code 947 was assigned on February 1, 2000, as an overlay to area code 248 to provide relief for central office code exhaustion in Oakland County, Michigan.

Suspension of Relief in the 248, 313 and 734 NPAs (Michigan)

All-services overlay plan for 947 approved

In 2001, the all-services overlay plan for area code 947 in the 248 numbering plan area was approved. This plan required the implementation of ten-digit dialing for all calls within the region.

NPA 947 overlay implemented on 248

Area code 947 was implemented as an all-services overlay in the 248 numbering plan area in 2001, allowing both codes to serve the same geographic region.

NPA 947 overlay activated for 248

Area code 947 was approved as an all-services overlay for area code 248 on June 7, 2001, with ten-digit dialing beginning after the permissive period on January 26, 2002.

Permissive ten-digit dialing period begins for 248/947

The permissive dialing period for ten-digit dialing began on January 26, 2002, in the 248 and 947 area codes. During this period, both seven-digit and ten-digit dialing were allowed as customers transitioned to the new overlay dialing requirements.

NPA 947 overlays 248

Area code 947 was introduced as an all-services overlay for the 248 numbering plan area in Michigan. The overlay was implemented on January 26, 2002, to provide additional numbering resources for Oakland County and parts of Wayne County.

Mandatory Dialing Postponed - 248/947 NPA Overlay (Michigan)