Established November 11, 1989 as the first split of Chicago-area 312 in decades, 708 originally covered nearly all Chicago suburbs before losing its north and west portions to 847 and 630 in 1996. Today it serves western and southern suburban Cook County plus parts of Will County.
The essentialsNumbering data · NumberResearch · as of 2026-09-18
Place
South/Near-West Chicago Suburbs
Type
geographic
Status
in service
In service since
1989
Projected exhaust
2053 Q2
Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.
A · Where it is
Where 708 is
Western and southern suburban Cook County and eastern/southern Will County.
Wikipedia lists ~60 municipalities; representative subset above.
B · Relationships
How it relates to other codes
The codes 708 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?
Split from · 1989312Chicago (The Loop / Downtown)708 split off from 312 on Nov 11, 1989, taking almost all Chicago suburbs.
Spawned · 1996847North/Northwest Chicago SuburbsNorth/northwest suburbs split off from 708 into 847 (in service Jan 1996).
Spawned · 1996630West Chicago Suburbs (DuPage County)West suburbs (DuPage) split off from 708 into 630 (in service Aug 1996).
Overlay · 2022464South/West Chicago Suburbs (overlay of 708)464 overlaid 708 on Jan 21, 2022; reserved for 708 relief since 1999.
What's changing. Overlaid by 464 since Jan 21, 2022; ten-digit dialing required.
C · History
How 708 got here
1989-11-11
708 created via split from 312, covering nearly all Chicago suburbs.
Source: Wikipedia - Area codes 708 and 464
1996-01
Northern suburbs removed from 708 into new 847.
Source: Illinois Commerce Commission chronology
1996-08
Western suburbs removed from 708 into new 630.
Source: Illinois Commerce Commission chronology
2022-01-21
464 overlay activated over 708.
Source: Wikipedia - Area codes 708 and 464
D · Capacity
How full it is
Prefixes assigned
798
Prefixes available
2
Thousands-blocks assigned
3,775
Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).
Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.
North American Numbers