Ontario, California

ZIP codes in Ontario

Area codes for Ontario

• Area code 909

  In service since November 14, 1992. Shares its area with 840. Local calls are dialed with 1 plus ten digits.

• Area code 840

  In service since February 23, 2021. Shares its area with 909. Local calls are dialed with 1 plus ten digits.

Area codes here are matched from telephone rate centers, so a place near a boundary can have local numbers from either side of it.

Time zone

Ontario is in the Pacific Time zone.

Towns near Ontario

• Guasti5 km (3.1 mi)
• Montclair5.7 km (3.5 mi)
• Upland7.5 km (4.7 mi)
• Chino8.5 km (5.3 mi)
• Claremont9.2 km (5.7 mi)
• Rancho Cucamonga10.3 km (6.4 mi)
• Pomona10.6 km (6.6 mi)
• San Antonio Heights11.1 km (6.9 mi)