Area code 730

Area code 730 Centralia, Illinois

Area code 730 is one of the newer area codes, added in 2023 to Illinois, with numbers assigned in Centralia, Herrin, Olney and 54 more places. It’s 11:10 PM there now.

State: Illinois17 area codes in Illinois
Time zone: Central11:10 PM there now
Exchanges: 13057 places
Overlay: 618Same area, 10-digit dialing

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Where area code 730 is

Numbers in 730 are assigned to 57 places in 25 counties: Williamson County, St. Clair County, Marion County, Jefferson County, Clinton County, Washington County, plus 19 more.

No single place dominates: Centralia, the largest, has 12% of the exchanges.

Centralia15
Herrin13
Olney12
Belleville12
Carbondale9
Collinsville5
Cairo3
Granite City3
Alton2
East St. Louis2
Kaskaskia1
Christopher1
Shawneetown1
Dongola1
Ridgway1
Iuka1
Brussels1
Bellmont1
Ina1
Kell1
Kinmundy1
Mulberry Grove1
Patoka1
St. Peter1

Phone companies in 730

130 blocks of numbers in 730 are held by 20 phone companies. The most belong to AT&T Mobility (44), Inteliquent (30) and Charter (Spectrum) (12).

A large share, about 51%, belongs to competitive and internet phone carriers; wireless networks hold 40% and local phone and cable companies 9%.

A block’s holder is the company it was first assigned to; numbers can move to other carriers since.

History and overlays

730 went into service in 2023, added to the area of 618.

618 (since 1947) shares the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.

130 new exchanges were assigned since 2021, the latest in October 2026.

Calling 730

It’s 11:10 PM Central time in 730 right now.

From elsewhere in the U.S., dial 1, 730 and the 7-digit number; inside the area, all 10 digits too.

Nearby area codes

Illinois has 17 area codes: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861 and 872.

From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.

Map of the 730 area code

Map of the 730 area code around Centralia, Herrin and Olney, Illinois.

Interactive map © OpenStreetMap contributors

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Questions about 730

Where is area code 730?

In Illinois, covering Centralia, Herrin and Olney and other places across 25 counties.

What time zone is 730 in?

Central time. It was 11:10 PM there when this page loaded.

Is 730 an overlay?

Yes. 618 serves the same area, so dial all 10 digits for local calls.

Which phone companies have 730 numbers?

20 companies hold blocks; the most belong to AT&T Mobility, Inteliquent and Charter (Spectrum). About 40% of blocks are wireless.

Is 730 running out of numbers?

Not on record. 130 new exchanges have been assigned since 2021.