Created in the three-way split of 708, in service January 1996, serving the northern and northwestern Chicago suburbs (Lake and northern Cook County). It has been overlaid by 224 since 2002.
The essentialsNumbering data · NumberResearch · as of 2026-09-18
Place
North/Northwest Chicago Suburbs
Type
geographic
Status
in service
In service since
1996
Projected exhaust
2033 Q3
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 847 is
Most of Lake County, northern Cook County, northern Kane County, and a small part of McHenry County.
Communities served wholly or partly by 847:
Arlington HeightsEvanstonSchaumburgSkokieWaukeganElginHoffman EstatesPalatineDes PlainesHighland Park
Wikipedia lists 140+ municipalities; representative subset.
B · Relationships
How it relates to other codes
The codes 847 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 · 1996708South/Near-West Chicago Suburbs847 split off from 708 (three-way split), in service Jan 1996.
Overlay · 2002224North/Northwest Chicago Suburbs (overlay of 847)224 overlaid 847; first NXX activated Dec 2001, overlay effective Jan 5, 2002.
Related · 1996630West Chicago Suburbs (DuPage County)Sibling code from the same 708 three-way split, covering west suburbs.
What's changing. Overlaid by 224 since 2002; ten-digit dialing required.
C · History
How 847 got here
1996-01
847 in service via three-way split of 708 (north/northwest suburbs).
Source: Wikipedia - Area codes 847 and 224
1998-06
Site of the first US trial of telephone number pooling to slow exhaustion.
Source: Wikipedia - Area codes 847 and 224
2002-01-05
224 overlay took effect over 847 (ten-digit dialing).
Source: Wikipedia - Area codes 847 and 224
D · Capacity
How full it is
Prefixes assigned
799
Prefixes available
1
Thousands-blocks assigned
2,211
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