Area code
517
517 is a United States area code. Under the North American Numbering Plan it belongs to Michigan, which has 13 area codes in total.
Validate a number in 517
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
Digits with or without punctuation work. Numbers outside the US are read with the +country code.
Area code 517 at a glance
NANPA lists 613 central office codes (prefixes) in use in area code 517, held by 59 holders across 78 rate centers.
| Fact | Value |
|---|---|
| In service since | 1947-01-01 |
| Time zone | Eastern (E) |
| Prefixes in use | 613 |
| Pooled prefixes | 408 (67%) |
| Rate centers | 78 |
| Companies holding prefixes | 59 |
| Assignment dates on file | 2001-01-25 to 2026-06-02 (296 prefixes) |
| ZIP codes in its places | 87 |
Rate centers in area code 517
| Rate center | Prefixes | Share |
|---|---|---|
| LANSING | 164 | 27% |
| JACKSON | 62 | 10% |
| HOWELL | 27 | 4% |
| ADRIAN | 26 | 4% |
| CHARLOTTE | 15 | 2% |
| HILLSDALE | 15 | 2% |
| COLDWATER | 14 | 2% |
| HOLT | 13 | 2% |
| 70 other rate centers | 277 | 45% |
Who holds the prefixes in 517
Michigan Bell Tel holds the most prefixes, 105 (17%). 67% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Michigan Bell Tel | 105 | 17% |
| Verizon Wireless | 60 | 10% |
| Acd Telecom | 56 | 9% |
| Omnipoint Communications Midwest Operations | 47 | 8% |
| New Cingular Wireless PCS | 39 | 6% |
| Frontier North | 30 | 5% |
| 53 other carriers | 276 | 45% |
A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. Find which carrier a number is on, or browse the prefix holders.
History of area code 517
- 1947-01-01 Area code 517 went into service.
- 2001-04-07 Area code 989 went into service and names 517 as its parent.
Area codes nearest to 517
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
ZIP codes in area code 517
87 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Lansing, MI | 22 |
| Jackson, MI | 4 |
| Howell, MI | 3 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 517 numbers
1,791 FCC complaints are on file for 1,355 numbers in 517, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 79 |
| 2024 | 107 |
| 2025 | 61 |
Other area codes in Michigan
Michigan is one state with 13 area codes in the NANPA table. 517 is one of them.
Next to 517 in the numbering table
These are the codes just before and after 517 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 517 was first assigned in Michigan. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in Michigan next to a 517 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 517
Where is area code 517?
NANPA assigns area code 517 to Michigan, United States.
In which state does area code 517 sit?
Michigan. 517 is one of 13 area codes the NANPA table assigns to the state.
Which places does area code 517 cover?
The places with the most ZIP codes among the rate centers in 517 are Lansing, MI, Jackson, MI and Howell, MI. The rate center list on this page shows all of them.
Who owns area code 517?
NANPA assigns area codes. Within 517, Michigan Bell Tel holds the most prefixes, 105 prefixes or 17%.
Which time zone does 517 use?
The NANPA NPA report lists the time zone for 517 as Eastern (E).
What year did 517 enter service?
The NANPA NPA report gives an in-service date of 1947-01-01, so 517 has been in use since 1947.
Does area code 517 have an overlay?
The NANPA NPA report lists no other area code in an overlay with 517.
Which area codes are nearest to 517?
The area codes closest to 517, measured between the centers of the ZIP code places they serve, are 734 (about 49 miles), 248 (about 64 miles), 947 (about 64 miles), 269 (about 67 miles) and 616 (about 71 miles).
How many prefixes does area code 517 have?
NANPA's report dated 2026-10-17 lists 613 prefixes in service in 517, spread over 78 rate centers and 59 holders.
Are there complaints about 517 numbers?
The FCC data on file has 1,791 complaints for 1,355 numbers in 517. They are unverified consumer reports. A number with no complaints on file is not proven safe.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.