Area Code 840 — San Bernardino, California

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About Area Code 840

Region Code
840
City
San Bernardino
State
California
Population
1,850,000
Largest City
San Bernardino
Neighboring Codes
  • 442/760 (Oceanside, California)
  • 626 (Pasadena, California)
  • 657/714 (Anaheim, California)
  • 951 (Riverside, California)
Time Zone
Pacific Time

Map of Area Code 840

Available Phone Numbers

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Same Area Code

View Full List of Numbers in 840 Area Code

History & Cultural Notes

Numbering relief for San Bernardino and the greater Inland Empire moved to an overlay solution in the early 2020s, when area code 840 was introduced alongside 909. The 909 code itself dates to a 1992 split from 714; Riverside County later separated again as 951 in 2004. The overlay ended remaining seven‑digit local dialing, standardizing ten‑digit calls and enabling continued growth without redrawing boundaries. Regulators deployed number conservation tools—thousands‑block pooling and local number portability—to slow exhaust before authorizing the overlay, reflecting steady expansion in mobile lines, logistics firms, and new housing across the I‑10/I‑15 corridors.

  • Logistics, warehousing, and e‑commerce fulfillment around intermodal rail, Ontario International Airport, and San Bernardino International.
  • Public sector, education, and healthcare anchors (city/county, CSU San Bernardino, regional hospitals).
  • Manufacturing and building materials supporting construction and regional supply chains.

San Bernardino’s telecom footprint mirrors its role as an Inland Empire hub: carriers extend fiber into warehouses and rail yards, and VoIP is common among small brokers and bilingual service providers. New numbers in 840 are issued as 909 inventory tightens, preserving existing lines while supporting growth from the valley to High Desert communities. Seasonal wildfire and earthquake preparedness also shapes network planning, with agencies emphasizing alerts, redundancy, and resilient backhaul.