Area Code 730

Illinois

Area code 730 serves Illinois, primarily Belleville, in the Central Time (CT) time zone. It is an overlay area code sharing territory with area code 618.

Overlay Area Code

This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.

This area code shares its geographic region with: area code 618 (Belleville).

In service since: 07-Jul-2023

Learn more about overlay and split area codes →

Demographics & Economics

Total Population: 1,806,463
Population Density: 61 people/sq mi
below U.S. average (U.S.: 93 people/sq mi)
Median Household Income: $68,870
near U.S. median (U.S.: $75,144)
Poverty Rate: 13.5%
above U.S. average (U.S.: 11.5%)
Unemployment Rate: 4.9%
above U.S. average (U.S.: 3.6%)
Education Attainment: Bachelor's Degree+
24.8%
below U.S. average (U.S.: 33.7%)
High School or Lower
33.6%

Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.

See how this area code compares to all US area codes in the income ranking and density ranking.

Time Zone

Central Time (CT)

NANPA Relief Status

According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.

Source: NANPA NPA Relief Planning Reports · See all relief planning statuses

Current Time

Central Time (CT)

Prefix Utilization

Geographic Coverage

State

Major Cities

Belleville
O'Fallon
Edwardsville
Alton
Collinsville
Carbondale
East St. Louis
Godfrey
Cahokia Heights
Marion
Fairview Heights
Swansea
Mount Vernon
Shiloh
Glen Carbon
Herrin
Centralia
Columbia
Waterloo
Troy
Wood River
Highland
Bethalto
Olney

and 310 more cities

Area Code 730 geographic coverage map (light mode)

Demographics

The estimated population served by area code 730 is approximately 1,806,463. The population density is 61 people per square mile, which is lower than the national average of 93. The median household income is $68,870, which is near the national median of $75,144. Approximately 24.8% of adults hold a bachelor's degree or higher, compared to the national rate of 33.7%. This rate is lower than the national average. The poverty rate stands at 13.5%, which is higher than the national rate of 11.5%.

History

Area code 730 serves as an overlay for the same territory as area code 618. It was introduced in 2023 to provide additional phone number capacity for the region. It shares its territory with area code area code 618.

County Coverage

Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 730).

County	Population	Share
St. Clair, IL	339,994	18.8%
Madison, IL	303,245	16.8%
Williamson, IL	118,456	6.6%
Jackson, IL	88,609	4.9%
Clinton, IL	76,094	4.2%
Jefferson, IL	60,220	3.3%
Macoupin, IL	51,922	2.9%
Marion, IL	47,215	2.6%
Monroe, IL	45,781	2.5%
Franklin, IL	45,564	2.5%
Jersey, IL	40,728	2.3%
Washington, IL	37,365	2.1%
Randolph, IL	37,253	2.1%
Wayne, IL	37,224	2.1%
Bond, IL	33,179	1.8%
Fayette, IL	33,031	1.8%
Perry, IL	31,636	1.8%
Pope, IL	31,527	1.7%
Saline, IL	30,415	1.7%
Union, IL	28,122	1.6%
Richland, IL	26,432	1.5%
Clay, IL	25,828	1.4%
Hamilton, IL	25,825	1.4%
Crawford, IL	23,551	1.3%
Lawrence, IL	18,634	1.0%
Massac, IL	18,298	1.0%
Johnson, IL	17,171	1.0%
White, IL	15,877	0.9%
Effingham, IL	15,603	0.9%
Gallatin, IL	14,682	0.8%
Greene, IL	14,428	0.8%
Wabash, IL	13,792	0.8%
Jasper, IL	11,513	0.6%
Alexander, IL	8,757	0.5%
Pulaski, IL	8,209	0.5%
Edwards, IL	7,561	0.4%
Hardin, IL	6,288	0.3%
Shelby, IL	5,445	0.3%
Calhoun, IL	4,099	0.2%
Clark, IL	3,198	0.2%
Montgomery, IL	3,056	0.2%
Cumberland, IL	636	0.0%