Central Office Exchange (NXX)

+1 (510) 621-XXXX

Serving Oakland, California, United States • Carrier: Mcimetro Access Transmission Services LLC

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Looking for a specific 4-digit line in the +1 (510) 621 block? Enter the last 4 digits below to inspect caller data and spam reports immediately:

+1 (510) 621 -

Sample Active Numbers in this Prefix

Random representative sampling of telephone lines in the 1-510-621 block

510-621 0025
510-621 0682
510-621 0733
510-621 1309
510-621 1410
510-621 1527
510-621 1540
510-621 1563
510-621 2406
510-621 2608
510-621 2695
510-621 2740
510-621 3422
510-621 3646
510-621 3701
510-621 3835
510-621 4384
510-621 4653
510-621 4928
510-621 5157
510-621 5223
510-621 5237
510-621 5672
510-621 5843
510-621 6215
510-621 6282
510-621 6751
510-621 6818
510-621 7039
510-621 7379
510-621 7760
510-621 7921
510-621 8562
510-621 8765
510-621 9016
510-621 9089
510-621 9507
510-621 9524
510-621 9708
510-621 9788

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Telecommunication Guide for Exchange 510-621

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

  • NPA (Numbering Plan Area): 510 identifies the geographic region within California.
  • NXX (Central Office Exchange): 621 identifies the local telephone exchange or switching office serving Oakland, California.
  • 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 (510) 621-XXXX
Mobile / Wireless Devices Dial with international plus symbol +1 510 621 XXXX
International Callers Local exit code + 1 + Number 00 1 510 621 XXXX

Frequently Asked Questions

The registered service provider for this exchange is Mcimetro Access Transmission Services LLC. 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: California
  • City / Area: Oakland
  • Area Code: 510
  • Prefix (NXX): 621
  • Carrier: Mcimetro Access Transmission Services LLC
  • Type: Landline
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Area Code 510

Explore other central office exchanges and municipalities covered by area code 510.

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