Area Code 517

About Area Code 517

Area code 517 is a geographic telephone area code assigned to Lansing, Michigan. It operates in the Eastern time zone and was first introduced in 1947. Original NANP code. South-central Michigan. Overlay 543 TBD.

Within Michigan, area code 517 shares numbering capacity with 11 other area codes. The state's 10,050,511-person population (2023 Census Bureau estimate) is served by a combined 12 active codes, with 517 primarily responsible for the Lansing region. Michigan's state capital is Lansing, and its largest city is Detroit.

When you receive a call from a 517 number on your Caller ID, the call originated from a phone number assigned to the 517 area code — but be aware that Local Number Portability (in effect since 2003) means the caller could be physically located anywhere in the US or Canada. Area code 517 only confirms where the number was originally assigned.

Where is the 517 area code located?

Area code 517 is assigned to Lansing, Michigan, in the Eastern time zone. The state of Michigan uses 12 active area codes, and 517 is one of them. Calls placed from the 517 area code originate from numbers assigned by NANPA — the North American Numbering Plan Administrator — and the 517 prefix appears on Caller ID for both landline and wireless calls placed from this region.

The Eastern time zone observes Daylight Saving Time, shifting from UTC-5 to UTC-4 in summer. The local time shown above is always current, so you can quickly check whether it's a reasonable hour to call back.

What cities and counties use the 517 area code?

The 517 area code serves 12 notable cities, listed below in order of population. The largest city in the 517 territory is Lansing (112,744 residents in Ingham County).

• Lansing, MI — 112,744 residents (6% of 517 numbers)
• Detroit, MI — 620,376 residents (33.2% of 517 numbers)
• Grand Rapids, MI — 198,917 residents (10.7% of 517 numbers)
• Warren, MI — 138,816 residents (7.4% of 517 numbers)
• Sterling Heights, MI — 133,896 residents (7.2% of 517 numbers)
• Ann Arbor, MI — 123,854 residents (6.6% of 517 numbers)
• Flint, MI — 79,948 residents (4.3% of 517 numbers)
• Dearborn, MI — 109,976 residents (5.9% of 517 numbers)
• Livonia, MI — 95,309 residents (5.1% of 517 numbers)
• Troy, MI — 86,806 residents (4.7% of 517 numbers)

Phone number format in area code 517

All phone numbers within area code 517 follow the standard North American 10-digit format:(517) NXX-XXXX. The NXX is the central office prefix (also called an "exchange") and XXXX is the subscriber line number. For long-distance calls within the NANP, dial 1 + 517 + NXX + XXXX. From outside North America, dial your country's international access code, then 1 (the NANP country code), then the 10-digit number.

If you need to verify whether a specific 517 number is wireless, landline, or VoIP, you can use our reverse phone lookup tool. Be aware that number portability means the area code no longer guarantees the caller's physical location — only where the number was first assigned.

History of area code 517

Original NANP code. South-central Michigan. Overlay 543 TBD.

The original 86 area codes were assigned by AT&T and Bell Labs in 1947 as part of the North American Numbering Plan. At the time, rotary-dial phones meant codes with lower digits (like 212 for NYC, 213 for LA, 312 for Chicago) were given to the largest cities because they took less time to dial. Today's area code assignments still reflect those early choices, even though touch-tone and cell phones made the original reason obsolete.

Is the 517 area code safe to answer?

Area code 517 itself is a normal geographic code with no elevated spam risk. That said, scammers can spoof any area code — including 517 — so if you don't recognize the full number, let it go to voicemail and verify the caller's identity before calling back.