North American NumbersSouth/West Chicago Suburbs (overlay of 708)
Area code 464 is an all-services overlay of area code 708, covering south and west suburban Cook County plus parts of Will County; it went into effect January 21, 2022. It was reserved in 1999 but not implemented for over two decades. It overlays the suburbs, NOT the city of Chicago.
Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.
Where 464 is
Most of western and southern Cook County, plus eastern/southern Will County (south and west Chicago suburbs).
Communities served wholly or partly by 464:
The ICC lists ~60 municipalities; this is the suburban 708 footprint, NOT the city of Chicago (which is 312/773/872).
How it relates to other codes
The codes 464 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?
How 464 got here
How full it is
Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.
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.