Area Code 484 — Philadelphia, Pennsylvania

NANP area code

484

UTC−5, UTC−4 during daylight saving

State
Pennsylvania
Primary city
Philadelphia
Time zone
Eastern
In service
1999
Overlays
610, 835

The code reaches 244 communities and 13 counties across Pennsylvania.

Was this call legitimate?

The area code itself carries no risk signal. 484 is assigned to Philadelphia, Pennsylvania, so a call from it is consistent with a real caller in that area — but the digits alone prove nothing, because they can be forged.

Caller ID is set by whoever places the call, not verified by the network. That is why neighbour spoofing works: an operation anywhere in the world can display a number that matches the area code — and often the first three digits after it — of the person being called, so the call looks local. Every community in the 484 territory is a plausible-looking origin for a forged 484 number, which is why one can be made to look like a neighbour to so many people. The same applies to its overlay codes 610 and 835, which serve the same ground.

If you did not recognise the call: let it go to voicemail — a legitimate caller with real business will leave one. Do not return the call using the number shown; look the organisation up independently and call the number you found. Never confirm personal details, card numbers, or one-time codes to someone who called you, however plausible the number looked.

Codes.zone publishes no complaint counts, risk scores, or caller identities. We hold no data on individual numbers and will not estimate what we cannot source.

Local time and when to call back

Time there now

Eastern · UTC−5, UTC−4 during daylight saving

Reasonable callback window

8:00 AM – 9:00 PM

local time in Eastern

Federal rules bar telemarketing calls to a residence outside 8:00 AM–9:00 PM in the called party's own time zone. It is a sensible bound for a personal callback too — and a caller who rang you well outside it was not observing it.

Overlay codes and ten-digit dialling

484 does not have its territory to itself. 610 and 835 cover the same ground, serving Philadelphia and the rest of the 484 territory. An overlay is what a regulator adds when a region runs out of assignable numbers: rather than splitting the area and forcing half the residents to change their number, a second code is laid over the top and new numbers are issued from it.

The practical consequence: two neighbours on the same street can hold numbers in different area codes, so the code tells you nothing about which part of town a caller is in — and local calls must be dialled as all ten digits, because seven is no longer unambiguous.

Cities served

largest 20 by ZIP count
Communities served by area code 484, ranked by how many ZIP codes each holds.
CityZIP codesCounty
Philadelphia87Delaware County
Reading12Berks County
Allentown8Lehigh County
Valley Forge7Chester County
Bethlehem6Lehigh County
Easton5Northampton County
Wayne4Delaware County
West Chester4Chester County
Concordville3Delaware County
Emmaus3Lehigh County
Lehigh Valley3Northampton County
Media3Delaware County
Norristown3Montgomery County
Southeastern3Chester County
Blue Bell2Montgomery County
Chester2Delaware County
Conshohocken2Montgomery County
Dallas2Luzerne County
Eagleville2Montgomery County
Harleysville2Montgomery County

224 further communities not listed. All Pennsylvania area codes →

Each point is a community served by 484, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.
  • Reference points and footprint
  • Not an official NANPA boundary
  • Not a USPS delivery area

Scope every community matched to 484. Source geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot), GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . Coordinates are place reference points, not boundaries.

Counties

Prefixes inside 484

We do not publish the NXX prefixes inside 484. The assignment of prefixes to rate centres comes from LERG routing data, which is proprietary, and we will not estimate it from postal data — ZIP codes and telephone prefixes do not map onto each other. Awaiting a clean-rights NPA-NXX source.

Why this code exists

484 sits in the middle of its complex. It was added in 1999 over 610 (1994), and was later joined by 835 (2022) as the region kept running short of numbers.