North American Numbers Source-cited · ownership disclosed
Area code
517
In service
United States · since 1947

Lansing

South-central Lower Michigan around the state capital Lansing; one of the original 1947 codes and, until the 2001 989 split, one of the very few original codes never split or overlaid.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Lansing
Type
geographic
Status
in service
In service since
1947
Projected exhaust
2056 Q3

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 517 is

South-central Lower Peninsula (Ingham, Jackson, Hillsdale, Lenawee, Eaton and surrounding counties)..

Communities served wholly or partly by 517:

LansingEast LansingJacksonAdrianHowellCharlotteMasonHoltAlbionColdwaterHillsdale

Territory greatly reduced in 2001 when the northern/central portion became 989.

B · Relationships

How it relates to other codes

The codes 517 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Spawned · 2001 989 Saginaw / Bay City / Midland Central/northern portion (Saginaw/Bay City area) split off from 517.
Related 734 Ann Arbor / western Wayne Adjacent to the east.
Related 616 Grand Rapids Adjacent to the west.
What's changing. No overlay; single code.
C · History

How 517 got here

1947
One of the original NANP area codes; originally covered most of the eastern half of the Lower Peninsula outside the southeast, including the Tri-Cities.
Source: Wikipedia
2001-04-07
Central and northern portions reassigned to new area code 989.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
639
Prefixes available
161
Thousands-blocks assigned
2,617

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 517 with another code →
Sources
Wikipedia ↗
Area code 517
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.