---
title: "Area code 517: Michigan, United States"
url: "https://lookvalid.com/area-code/517.md"
canonical_url: "https://lookvalid.com/area-code/517"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 517 serves Michigan, United States. Number formats, numbering rules, a live phone validator and the other codes in Michigan."
---

# Area code 517: Michigan, United States

Area code 517 serves Michigan, United States. Number formats, numbering rules, a live phone validator and the other codes in Michigan.

NANPA lists 613 central office codes (prefixes) in use in area code 517, held by 59 holders across 78 rate centers.
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.
The FCC unwanted-call data has 1,791 complaints on file for 1,355 numbers in 517, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- 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

| 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% |

## Carriers

| 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.

## History

- 1947-01-01: Area code 517 went into service.
- 2001-04-07: Area code 989 went into service and names 517 as its parent.

## Nearest area codes

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).

## ZIP codes

87 ZIP codes fall in places that have a rate center in this area code. The places with the most are Lansing, MI (22 ZIP codes), Jackson, MI (4 ZIP codes) and Howell, MI (3 ZIP codes). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes.

## Complaints on file

1,791 complaints for 1,355 numbers. Numbers whose latest complaint falls in each year:

- 2023: 79
- 2024: 107
- 2025: 61

## Questions

### 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.

Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).