Pennsylvania has 15 active area codes as of 2026, covering the state through a mix of original 1947 assignments, geographic splits, and modern overlays. This guide walks through the full list, which regions each code serves, the order they came online, and where new codes are most likely to land next.
The Short Answer
Pennsylvania currently has 15 active area codes in service. The count reflects a combination of population growth, the rise of mobile lines, and the way modern numbering allocates blocks — every line activated, whether a cellphone, a business desk line, a VoIP number, or a connected device, consumes a slot in the pool.
By population, Pennsylvania ranks #5 nationally with roughly 13,078,751 residents as of the most recent estimates. That puts the state’s area code count in line with its population peers — denser, faster-growing states need more codes; smaller states need fewer.
The Full List of Pennsylvania Area Codes
The active area codes serving Pennsylvania are listed below, in numerical order. Where a code is an overlay or a split-off from an earlier code, that relationship is noted.
- 215 — Philadelphia and adjacent parts of Bucks and Montgomery counties
- 223 — South-central Pennsylvania (Harrisburg, Lancaster, York) (overlay of 717)
- 267 — Philadelphia and adjacent parts of Bucks and Montgomery counties (overlay of 215)
- 272 — Northeastern Pennsylvania (Scranton, Wilkes-Barre) (overlay of 570)
- 412 — Pittsburgh and Allegheny County
- 445 — Philadelphia and adjacent parts of Bucks and Montgomery counties (overlay of 215 and 267)
- 484 — Southeastern Pennsylvania outside Philadelphia (Lehigh Valley, Reading) (overlay of 610)
- 570 — Northeastern Pennsylvania (Scranton, Wilkes-Barre, Williamsport)
- 582 — Northwestern and central Pennsylvania (Erie, Altoona, State College) (overlay of 814)
- 610 — Southeastern Pennsylvania outside Philadelphia (Lehigh Valley, Reading, Delaware County)
- 717 — South-central Pennsylvania (Harrisburg, Lancaster, York)
- 724 — Western Pennsylvania surrounding Pittsburgh
- 814 — Northwestern and central Pennsylvania (Erie, Altoona, State College, Johnstown)
- 835 — Southeastern Pennsylvania outside Philadelphia (Lehigh Valley, Reading) (overlay of 610 and 484)
- 878 — Southwestern Pennsylvania (Pittsburgh metro) (overlay of 412 and 724)
How Pennsylvania’s Area Codes Grew Over Time
Pennsylvania was assigned 4 area codes in the original 1947 NANP launch — 215, 412, 717, 814 — reflecting the state’s population and territorial size at the time. Subsequent splits and overlays have added codes as demand has grown.
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Browse Pennsylvania Area Codes →- 1947 — Pennsylvania was divided into four numbering plan areas at the launch of the North American Numbering Plan: 215 for Philadelphia and the southeast, 412 for Pittsburgh, 717 for the eastern half of the state except the Delaware and Lehigh Valleys, and 814 for the northwest and central regions.
- 1994 — 610 split off from 215 on January 8, 1994, covering southeastern Pennsylvania outside Philadelphia, including the Lehigh Valley. It was Pennsylvania's first new area code since 1947.
- 1997 — 267 was added as an overlay of 215 in the Philadelphia area.
- 1998 — 724 split off from 412 on February 1, 1998, leaving 412 as an enclave for the city of Pittsburgh and Allegheny County, with 724 surrounding it.
- 1998 — 570 split off from 717 for northeastern Pennsylvania, including Scranton, Wilkes-Barre, and Williamsport.
- 1999 — 484 was added as an overlay of 610 on June 5, 1999, alongside the introduction of mandatory ten-digit dialing in that region.
- 2001 — 878 was activated as an overlay of both 412 and 724, covering the southwestern corner of the state.
- 2013 — 272 was added as an overlay of 570 in northeastern Pennsylvania.
- 2017 — 223 was activated as an overlay of 717 on September 26, 2017, serving the south-central region around Harrisburg, Lancaster, and York.
- 2018 — 445 was added as a second overlay of the 215/267 numbering plan area in the Philadelphia region.
- 2021 — 582 was added as an overlay of 814 in northwestern and central Pennsylvania.
- 2022 — 835 was placed in service on September 2, 2022, as a second overlay of the 610/484 numbering plan area in southeastern Pennsylvania.
Why Pennsylvania Needs So Many Area Codes
A single area code can hold roughly 7.9 million possible phone numbers in theory — 792 valid central office codes (the second three digits) multiplied by 10,000 line numbers each. In practice the usable count is lower, because blocks of numbers are reserved, withheld, or assigned in bulk to carriers that may never fully use them. When the pool of available numbers in an area code falls below the threshold the North American Numbering Plan Administrator (NANPA) tracks, the state requests relief, and either a split or an overlay is approved.
Pennsylvania’s population of roughly 13,078,751 residents would, on its own, fit comfortably inside a single area code’s capacity. The reason 15 codes are needed instead is that every adult typically carries at least one mobile line, many households have multiple lines per person, businesses concentrate phone numbers at extreme density, and connected devices, VoIP services, and second-line apps all draw from the same pool. The math compounds quickly.
Because Pennsylvania sits in the top tier of states by code count, the relief pattern over the past two decades has been almost exclusively overlay-based. Overlays add a new code on top of the existing geography rather than splitting it, which means no existing customer has to change their number — the only adjustment is that all local calls become ten-digit. The trade-off is invisible to most users today, since contact lists handle dialing automatically.
Pennsylvania Area Codes by Region
Philadelphia (215, 267, 445): Philadelphia and adjacent parts of Bucks and Montgomery counties. 215 is the original from 1947; 267 was added as an overlay in 1997; 445 was added as a second overlay in 2018.
Southeastern Pennsylvania (Lehigh Valley) (610, 484, 835): The Lehigh Valley, Reading, Delaware County, and the suburbs west of Philadelphia. 610 split off from 215 in 1994; 484 overlay added in 1999; 835 overlay added in 2022.
Pittsburgh and southwestern Pennsylvania (412, 724, 878): Pittsburgh, Allegheny County, and the surrounding western counties. 412 is the original from 1947; 724 split off in 1998 to surround the city; 878 overlay added in 2001 across both 412 and 724.
South-central Pennsylvania (717, 223): Harrisburg, Lancaster, and York. 717 is the original from 1947; 223 overlay added in 2017.
Northeastern Pennsylvania (570, 272): Scranton, Wilkes-Barre, and Williamsport. 570 split off from 717 in 1998; 272 overlay added in 2013.
Northwestern and central Pennsylvania (814, 582): Erie, Altoona, State College, and Johnstown. 814 is the original from 1947; 582 overlay added in 2021.
What’s Next for Pennsylvania Area Codes
Every Pennsylvania numbering plan area is now an overlay complex, and the overlays added between 2017 and 2022 (223, 445, 582, and 835) gave each region substantial additional capacity. NANPA’s recent NPA exhaust projections show no Pennsylvania area code on the near-term relief schedule. The Philadelphia 215/267/445 complex and the southeastern 610/484/835 complex are the densest pools and the most likely candidates for the next relief action, but no additional code is projected to be needed in the immediate future.
Frequently Asked Questions
How many area codes does Pennsylvania have right now?
Pennsylvania has 15 active area codes in service across the territory it covers, including any overlays that share geography with an older code.
What is the oldest area code in Pennsylvania?
215 is the oldest active area code in Pennsylvania, assigned in 1947 when the North American Numbering Plan launched. It remains in service today, though its geographic footprint has typically been reduced by subsequent splits and overlays.
What is the newest area code in Pennsylvania?
The most recent area code addition to Pennsylvania was 835, activated in 2022. New phone lines provisioned in its service area are increasingly drawn from this code as older overlays approach exhaustion.
Why does Pennsylvania need so many area codes?
Population growth combined with the proliferation of mobile lines, business direct-dial numbers, VoIP services, and connected devices has exhausted older codes faster than the original 1947 plan anticipated. Each new area code adds roughly 7.9 million additional phone numbers to the regional pool.
Which area codes cover Philadelphia?
Philadelphia and its immediate suburbs in Bucks and Montgomery counties are served by three overlay codes: 215 (the original, dating to 1947), 267 (added 1997), and 445 (added 2018). All three cover the same geography, so new lines in the city may be assigned any of them.
Which area code covers Pittsburgh?
Pittsburgh and Allegheny County use 412, the original code from 1947. The surrounding western Pennsylvania counties use 724, which split from 412 in 1998, and 878 overlays both 412 and 724 across the southwestern corner of the state.
Is 717 still Harrisburg's area code?
Yes. 717 still serves Harrisburg, Lancaster, and York, and existing numbers were not changed. Since 2017 the 223 overlay shares the same geography, so new lines in the region may carry either 717 or 223, and ten-digit dialing is required.
Why does Pennsylvania have 15 area codes when it started with 4?
Pennsylvania began with four codes in 1947 (215, 412, 717, 814). Demand from cell phones, fax machines, and additional lines led to a series of splits and overlays beginning in 1994, expanding the total to 15. Every region of the state now has at least two codes and uses mandatory ten-digit dialing.
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