🇺🇸 United States · Illinois
Area code 331
Area code 331 is a telephone area code in Illinois, United States. Local time is UTC−6 (UTC−5 in summer). Numbers look like (331) 234-5678, or +1 331 234 5678 from abroad.
- State
- Illinois
- Time zone
- Chicago UTC−6 (UTC−5 in summer)
- Local time now
- –
- Dial from abroad
- +1 331
How to dial area code 331
| Calling from | You dial |
|---|---|
| Inside the 331 area | 331 234 5678 (10 digits) |
| Elsewhere in the US & Canada | 1 331 234 5678 |
| Any mobile phone, anywhere | +1 331 234 5678 |
| UK, Europe, India and most countries | 00 1 331 234 5678 |
| Australia | 0011 1 331 234 5678 |
Other area codes in Illinois
Area code 331: FAQ
Where is area code 331?
Area code 331 is in Illinois, United States.
What time zone is area code 331 in?
Area code 331 is in the America/Chicago time zone (UTC−6 (UTC−5 in summer)).
How do I call a 331 number from outside the US and Canada?
Dial your exit code (00 in most countries, or + on a mobile), then 1, then 331 and the seven-digit number. Example: +1 331 234 5678.
Is a call from area code 331 a scam?
Area code 331 is a regular North American area code, but caller ID can be spoofed: scammers often show local-looking numbers. Do not call back unknown numbers that ask for money or personal data, and check the number with the phone number validator to see whether it is valid and whether it is a mobile, landline or VoIP number.
Phone number API
Check 331 numbers in your app
numlookupapi checks any phone number worldwide in one request and returns validity, line type, carrier, location and every standard format as JSON.
Read the documentation100 free requests every month. No credit card required.
GET https://api.numlookupapi.com/v1/validate/+13312345678
{
"valid": true,
"number": "12069220880",
"local_format": "2069220880",
"international_format": "+12069220880",
"country_prefix": "+1",
"country_code": "US",
"country_name": "United States of America",
"location": "Seattle",
"line_type": "landline",
"e164_format": "+12069220880",
"national_format": "(206) 922-0880"
}