The 630 area code covers Roselle, Hinsdale and 31 more places in Illinois.
Area code 630 is in Illinois, on Central Time. In the 630 area, phone numbers are given out most in DuPage County, then Cook and Kane counties. It has been in service since August 3, 1996. 331 covers the same area, so two neighbours can have different area codes.
- Where
- 4 counties in Illinois, mostly DuPage County, Cook County and Kane County
- Time zone
- Central Time
- In service since
- August 3, 1996
- Shares its area with
- 331 (since 2007)
- Prefixes in use
- 782
- How to dial
- Local calls need 1, then the area code, then the number: 1-630-555-0142.
Find out who called you from a 630 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (630) number is on today, use our free carrier lookup.
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Roselle holds 10% of the phone prefixes in area code 630.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 782 prefixes in use shows where 630 numbers are actually given out.
- Roselle77 prefixes, 10%
- Hinsdale75 prefixes, 10%
- Naperville74 prefixes, 9%
- La Grange74 prefixes, 9%
- Downers Grove56 prefixes, 7%
- Aurora55 prefixes, 7%
- Elmhurst44 prefixes, 6%
- Lombard37 prefixes, 5%
Also served: Northbrook, Wheaton, Bensenville and Lemont and 21 smaller places.
Illinois Bell (AT&T) holds the most phone number prefixes in area code 630: 258 of 782.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 782 prefixes in use in 630 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| Illinois Bell (AT&T)AT&T's landline company | 258 | 33% |
| AT&T MobilityMobile network | 103 | 13% |
| T-MobileMobile network | 76 | 10% |
| Teleport (AT&T)AT&T's business phone network | 57 | 7% |
| Level 3 (Lumen)Lumen's business and wholesale network | 56 | 7% |
| PAETEC (Windstream)Windstream's business phone network | 35 | 4% |
| 14 other carriers | 197 | 25% |
62% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
630 has been overlaid once since 1996.
1996
630 starts on August 3, 1996, split off from 708.
2007
On October 7, 2007, 331 is added on top of 630, so new numbers here can get either code.
A 630 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 630 are 847, 312 and 708.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
These are the questions people ask most about area code 630.
Where is area code 630?
630 covers Roselle, Hinsdale, Naperville and La Grange and 29 more places in Illinois. In the 630 area, phone numbers are given out most in DuPage County, then Cook and Kane counties.
What state is area code 630 in?
Illinois. 630 is an Illinois area code on Central Time.
What cities use area code 630?
The places holding the most 630 prefixes are Roselle, Hinsdale, Naperville, La Grange, Downers Grove, Aurora, Elmhurst and Lombard, out of 33 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 630?
No single phone company owns 630. NANPA's records show Illinois Bell (AT&T) holds the most 630 prefixes, 258 of 782, followed by AT&T Mobility and T-Mobile. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 630 in?
630 is on Central Time.
When did area code 630 start?
630 went into service on August 3, 1996, when it was split off from 708.
Is 630 the same area as 331?
Yes. 331 (since 2007) covers the same ground as 630. Nobody's number changed when it was added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 630 number?
Local calls need 1, then the area code, then the number: 1-630-555-0142.
Is 630 a toll-free number?
No. 630 is a regular area code for Roselle and Hinsdale in Illinois, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 630?
The closest are 847/224 (Northbrook, Illinois), 312/773/872 (Chicago, Illinois), 708/464 (La Grange, Illinois) and 815/779 (Rockford, Illinois), measured between the centres of each area.
Who called me from a 630 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 630 a scam?
630 is a real Illinois area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.