Area code 517

About area code 517

Area code 517 is a geographic area code in Michigan, in service since January 1, 1947, according to the North American Numbering Plan Administrator (NANPA). It is not part of an overlay, so every number in its territory starts with 517. It is in the Eastern time zone. The places with the most assigned exchanges include Lansing, Jackson, Adrian, Howell, and Hillsdale. By population, its largest named places are Lansing, Clinton, Jackson, Adrian, and DeWitt.

Places served by 517

517 holds 9.0% of the 6,882 central office codes assigned in Michigan, the 5th most of the state's 13 codes. 60 Census places could be matched to rate centers with 517 exchanges; the most populous are Lansing (114,000), Clinton (101,000), Jackson (30,920), and Adrian (20,259). Each place page lists the exact prefixes and carriers for that town.

How calls are dialed in 517

According to NANPA's dialing-plan data, local calls within 517 are dialed as seven digits and toll calls as 1 plus ten digits. Seven-digit local dialing is still permitted here, but customers calling from other area codes, and every mobile contact list, use all ten digits.

Carriers with 517 numbers

59 carriers hold the 616 central office codes assigned in 517. Michigan Bell Tel CO has the most, with 105 (17%). 411 of the codes (67%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. The code holder is not necessarily the carrier serving a given number today, since numbers can be ported between providers.

Where 517 numbers are rated

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 517 has codes in 78 rate centers. Rate center names in the file are abbreviations; where one matches a Census place, the table links to that city's local-number page.

How full is area code 517?

An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 616 are assigned in 517, 77% of 800. 60 were assigned in 2020 or later.

Using area code 517 for business calls

Callata is a business phone system priced at $99 a month with 5 users included, then $20 per additional user. Callata Office includes up to 3 local business numbers, unlimited inbound calling, 1,500 pooled outbound US and Canada minutes per user each month, a browser softphone that can also ring your cell, voicemail with transcription, call recording with AI summaries, business-hours routing and E911 on every number.

Porting a number you already use in area code 517 is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.