Central Office Exchange (NXX)

+1 (610) 510-XXXX

Serving Allentown, Pennsylvania, United States • Carrier: Core Communications

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+1 (610) 510 -

Sample Active Numbers in this Prefix

Random representative sampling of telephone lines in the 1-610-510 block

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Telecommunication Guide for Exchange 610-510

Under the North American Numbering Plan (NANP), a standard 10-digit telephone number is organized as NPA-NXX-XXXX:

  • NPA (Numbering Plan Area): 610 identifies the geographic region within Pennsylvania.
  • NXX (Central Office Exchange): 510 identifies the local telephone exchange or switching office serving Allentown, Pennsylvania.
  • XXXX (Subscriber Line Number): 10,000 distinct telephone lines (ranging from 0000 to 9999) are routed through this exchange.
How to Correctly Dial Numbers in this Prefix:
Call Origin Dialing Instructions Example
Local or Domestic (US/Canada) Dial 1 + 10-Digit Number 1 (610) 510-XXXX
Mobile / Wireless Devices Dial with international plus symbol +1 610 510 XXXX
International Callers Local exit code + 1 + Number 00 1 610 510 XXXX

Frequently Asked Questions

The registered service provider for this exchange is Core Communications. Note that individual line numbers may have been transferred to other providers via Local Number Portability (LNP).
Calls from this prefix could originate from local businesses, hospitals, friends, or automated dialers. If you received an unsolicited call from an unknown party in this exchange, enter the full 4 digits in our search box above to check for community scam or telemarketer reports.

Exchange Information

  • Country: Unites States (+1)
  • State: Pennsylvania
  • City / Area: Allentown
  • Area Code: 610
  • Prefix (NXX): 510
  • Carrier: Core Communications
  • Type: Landline
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Area Code 610

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