Area code 925

Largest exchanges

• Walnut Crk103
• Concord89
• Pleasanton76
• Antioch67
• Livermore50
• Bshp Rnch43
• Dubln-Snrm42
• Danville38
• Martinez22
• Econtrcost22

Largest carriers

• Pacific Bell206
• New Cingular Wireless Pcs, LLC48
• T-mobile Usa, Inc.44
• Mcimetro Access Transmission Services LLC39
• Cellco Partnership dba Verizon Wireless - CA38
• U.s. Telepacific Corp. dba Tpx Communications37
• Level 3 Communications, LLC - CA33
• Onvoy, LLC - CA32
• Teleport Communications America, LLC - CA25
• Metropcs, Inc.23

Most reported 925 numbers

No visitor reports yet in this area code.

FCC complaints

• 925-514-41701 · 2026-10-07