North American Numbers Source-cited · ownership disclosed
Area code
447
In service
United States · since 2021

Central Illinois (overlay of 217)

Area code 447 is an all-services overlay of area code 217 covering central Illinois (Springfield, Champaign, Decatur); it went into service March 27, 2021. It has NO relationship to Chicago's 312/773/872.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Central Illinois (overlay of 217)
Type
geographic
Status
in service
In service since
2021
Projected exhaust
2046 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 447 is

Central Illinois - the entire 217 numbering-plan area.

Communities served wholly or partly by 447:

SpringfieldChampaignUrbanaDecaturDanvilleQuincyEffinghamLincolnJacksonville

Same footprint as 217; representative subset. This is central Illinois, NOT the Chicago metro.

B · Relationships

How it relates to other codes

The codes 447 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?

Overlay · 2021 217 Central Illinois (Springfield) All-services overlay of 217, central Illinois. 217 is an original 1947 code; 447 was its first overlay.
What's changing. Active all-services overlay of 217 (central Illinois) since March 27, 2021.
C · History

How 447 got here

2006
Illinois Commerce Commission approved an all-services overlay of the 217 numbering-plan area.
Source: Wikipedia - Area codes 217 and 447
2021-02-27
Ten-digit dialing became mandatory for local calls.
Source: Wikipedia - Area codes 217 and 447
2021-03-27
447 activated; new central-office codes available for assignment.
Source: Wikipedia - Area codes 217 and 447
D · Capacity

How full it is

Prefixes assigned
233
Prefixes available
567
Thousands-blocks assigned
1,236

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 447 with another code →
Sources
Wikipedia ↗
Area codes 217 and 447
NumberResearch.org ↗
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.