Allentown/Reading (overlay)

484 is an overlay of area code 610 covering the Lehigh Valley, Reading, and Philadelphia's western/southern suburbs, added in 1999.

The essentials Numbering data · NumberResearch · as of 2026-09-18

Place

Type

geographic

Status

in service

In service since

1999

Projected exhaust

2050 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 484 is

Eastern/southeastern Pennsylvania (same footprint as 610).

Communities served wholly or partly by 484:

AllentownBethlehemReadingWest ChesterEaston

Shares the 610 territory.

B · Relationships

How it relates to other codes

The codes 484 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?

Overlay · 1999 610 Allentown/Reading/Western Suburbs 484 overlays 610.

Overlay · 2022 835 Allentown/Reading (overlay) Third code in the 610/484/835 overlay complex.

What's changing. Active; part of 610/484/835 overlay.

C · History

How 484 got here

1999-06-05

Activated as overlay on 610 with mandatory 10-digit dialing.

Source: Wikipedia 610/484/835

D · Capacity

How full it is

Prefixes assigned

800

Prefixes available

Thousands-blocks assigned

5,529

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

Compare 484 with another code →

Sources

Wikipedia ↗

Area codes 610, 484, and 835

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.