Area codes / Kansas / 620
The 620 area code
620 is an area code in Kansas, in the Central and Mountain time zones. Get a local 620 number for your business, shared by everyone who answers it, or bring the 620 number you already have.
620 at a glance
- State
- Kansas
- Time zone
- Central and Mountain
- In service since
- 2001
- Overlay
- None: the only code for its area
- Local calls
- Dialed with all ten digits (area code and number)
Get a 620 business number
When you sign up for Onyx Phone, you pick a local number by area code: search 620, narrow it by the next three digits or the last four if you want something memorable, and it's yours on the spot. Which numbers are free changes daily.
The number rings everyone you assign to it, in the browser, on the iPhone and Android apps, and on desk phones, and texts from it are unlimited once US carriers approve your business. Your plan includes one number for each user, and more numbers are $5 a month.
Calling 620 customers
Local calls in 620 are dialed with all ten digits: the area code, then the number. 620 spans the Central and Mountain time zones, so the local time depends on where the caller is.
Calls from Onyx Phone show your business number, and once your business is verified, your caller ID name too, so 620 customers see who's calling.
Questions about area code 620
What state is area code 620?
Area code 620 is in Kansas.
What time zone is area code 620 in?
Area code 620 covers places in the Central and Mountain time zones, so check which one a caller is in before you call early or late.
Is 620 an overlay area code?
No. Today 620 is the only area code for its part of Kansas.
Can I get a 620 business number?
Onyx Phone sells US local numbers. When you pick your number, search the 620 area code; which numbers are free changes daily.
Can I keep the 620 number I already have?
Yes. Moving a number to Onyx Phone is free on every plan and usually takes 3 to 7 business days. You answer on a temporary number until it moves.
Included on every plan
Starter is $17, Business is $29, Scale is $42 per user a month, or less billed yearly. The plan includes a business number for each user and unlimited calling and texting in the US and Canada. Every plan starts with a 7-day free trial, and moving your current number over is free.
Area code data from the North American Numbering Plan Administrator (NANPA), file of October 24, 2026.