North American Numbers Source-cited · ownership disclosed
Area code
717
In service
United States · since 1947

Harrisburg/Lancaster/York

One of the original 1947 area codes, 717 serves south-central Pennsylvania including Harrisburg, Lancaster, and York after the 1998 570 split; it is overlaid by 223.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Harrisburg/Lancaster/York
Type
geographic
Status
in service
In service since
1947
Projected exhaust
2054 Q1

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 717 is

South-central Pennsylvania.

Communities served wholly or partly by 717:

HarrisburgLancasterYork

Covers all or parts of sixteen counties (~2 million people) including Pennsylvania Dutch Country.

B · Relationships

How it relates to other codes

The codes 717 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 · 1998 570 Northeastern PA Northern 717 territory (Scranton/Wilkes-Barre) split off to 570 on Dec 5, 1998.
Overlay · 2017 223 Harrisburg (overlay) 223 overlays 717.
What's changing. Overlaid by 223; 10-digit dialing mandatory.
C · History

How 717 got here

1947
Established as an original area code for eastern PA (excl. Delaware/Lehigh Valleys).
Source: Wikipedia 717/223
1998-12-05
570 split off the northern portion.
Source: Wikipedia 717/223
2017-09-26
223 overlay effective (10-digit dialing mandatory Aug 26, 2017).
Source: Wikipedia 717/223
D · Capacity

How full it is

Prefixes assigned
800
Prefixes available
0
Thousands-blocks assigned
3,963

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

Compare 717 with another code →
Sources
Wikipedia ↗
Area codes 717 and 223
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.