Area Code Atlas

708 split to create 847 and 630

In 1996, area code 708 was reduced in a three-way split. The northern suburbs received area code 847, and the western suburbs were assigned area code 630, while 708 continued to serve the southern and western suburbs of Chicago.

NPA 847 split from 708

Area code 847 was created on January 20, 1996, as part of a three-way split of area code 708. The new code served the northern suburbs of Chicago, including most of Lake County and parts of Cook, Kane, and McHenry counties.

Area codes 847 and 630 split from 708

Area codes 847 and 630 were created on October 11, 1996, by splitting the northern and western suburbs respectively from area code 708.

Declaration of Jeopardy Situation in NPA 847 (Illinois)

First U.S. telephone number pooling trial in 847

In June 1998, area code 847 was the site of the first trial of telephone number pooling in the United States. The trial was conducted to avert central office code exhaustion in the numbering plan area.

NANP-Overlay of 847 (Illinois) Numbering Plan Area (NPA) with 224 NPA

No Mandatory date set for 1 +10 digit dialing in Chicago NPA 847/224 Overlay; update to PL-127

Mandatory Dialing Date Established for NPAs 847 and 224 (Illinois)

NPA 224 overlays 847

On January 5, 2002, area code 224 was assigned as an overlay to area code 847 in the northern suburbs of Chicago, Illinois. This overlay was implemented due to rapid number exhaustion and required ten-digit dialing in all affected communities.

Ten-digit dialing became mandatory in the 847/224 region

The introduction of the 224 overlay required ten-digit dialing in all affected communities within the 847/224 numbering plan area.