---
title: "Area code 630: Illinois, United States"
url: "https://lookvalid.com/area-code/630.md"
canonical_url: "https://lookvalid.com/area-code/630"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 630 serves Illinois, United States. Number formats, numbering rules, a live phone validator and the other codes in Illinois."
---

# Area code 630: Illinois, United States

Area code 630 serves Illinois, United States. Number formats, numbering rules, a live phone validator and the other codes in Illinois.

NANPA lists 781 central office codes (prefixes) in use in area code 630, held by 21 holders across 33 rate centers.
Illinois Bell Tel holds the most prefixes, 258 (33%). 61% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
The FCC unwanted-call data has 4,635 complaints on file for 3,439 numbers in 630, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- In service since: 1996-08-03
- Time zone: Central (C)
- Assigned overlays: 331 (2007-10-07)
- Prefixes in use: 781
- Pooled prefixes: 480 (61%)
- Rate centers: 33
- Companies holding prefixes: 21
- Assignment dates on file: 2001-01-03 to 2025-05-12 (135 prefixes)
- ZIP codes in its places: 49

## Rate centers

| Rate center | Prefixes | Share |
| --- | --- | --- |
| ROSELLE | 77 | 10% |
| HINSDALE | 75 | 10% |
| LA GRANGE | 74 | 9% |
| NAPERVILLE | 74 | 9% |
| AURORA | 55 | 7% |
| DOWNERSGRV | 55 | 7% |
| ELMHURST | 44 | 6% |
| LOMBARD | 37 | 5% |
| 25 other rate centers | 290 | 37% |

## Carriers

| Holder | Prefixes | Share |
| --- | --- | --- |
| Illinois Bell Tel | 258 | 33% |
| New Cingular Wireless PCS | 102 | 13% |
| T-Mobile USA | 76 | 10% |
| Verizon Wireless | 75 | 10% |
| Mcimetro Access Transmission Services | 60 | 8% |
| Teleport Communications America | 57 | 7% |
| 15 other carriers | 153 | 20% |

A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company.

## History

- 1989-11-11: Area code 708, named as the parent of 630 in the NANPA report, was in service.
- 1996-08-03: Area code 630 went into service.
- 2007-10-07: Area code 331 went into service as an overlay in the same area as 630.

## Nearest area codes

The area codes closest to 630, measured between the centers of the ZIP code places they serve, are 312 (about 15 miles), 708 (about 22 miles), 847 (about 22 miles), 224 (about 23 miles) and 464 (about 28 miles).

## ZIP codes

49 ZIP codes fall in places that have a rate center in this area code. The places with the most are Aurora, IL (10 ZIP codes), Naperville, IL (6 ZIP codes) and Elgin, IL (5 ZIP codes). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes.

## Complaints on file

4,635 complaints for 3,439 numbers. Numbers whose latest complaint falls in each year:

- 2023: 143
- 2024: 186
- 2025: 291

## Questions

### Where is area code 630?

NANPA assigns area code 630 to Illinois, United States.

### In which state does area code 630 sit?

Illinois. 630 is one of 17 area codes the NANPA table assigns to the state.

### Which places does area code 630 cover?

The places with the most ZIP codes among the rate centers in 630 are Aurora, IL, Naperville, IL and Elgin, IL. The rate center list on this page shows all of them.

### Who owns area code 630?

NANPA assigns area codes. Within 630, Illinois Bell Tel holds the most prefixes, 258 prefixes or 33%.

### Which time zone does 630 use?

The NANPA NPA report lists the time zone for 630 as Central (C).

### What year did 630 enter service?

The NANPA NPA report gives an in-service date of 1996-08-03, so 630 has been in use since 1996.

### Does area code 630 have an overlay?

Yes. 331 (in service 2007-10-07) shares the same area with 630, so numbers from all of them are local to each other.

### Which area codes are nearest to 630?

The area codes closest to 630, measured between the centers of the ZIP code places they serve, are 312 (about 15 miles), 708 (about 22 miles), 847 (about 22 miles), 224 (about 23 miles) and 464 (about 28 miles).

### How many prefixes does area code 630 have?

NANPA's report dated 2026-10-17 lists 781 prefixes in service in 630, spread over 33 rate centers and 21 holders.

### Are there complaints about 630 numbers?

The FCC data on file has 4,635 complaints for 3,439 numbers in 630. They are unverified consumer reports. A number with no complaints on file is not proven safe.

Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).