Reference Data
Area Code Directory
Area Code 738 — Ontario, California

Area Code 738 — Ontario, California

Active

Data last updated: March 10, 2026

State
California
Country
US
Timezone
America/Los_Angeles
Assigned
September 8, 2025
Exchanges (NXX)
786
Carriers
4
Rate Centers
10
Overlay
Yes — 213, 323

Top Carriers

Carrier OCN NXX Count
ONVOY, LLC - CA 649C 8
WIDE VOICE, LLC - CA 252F 4
T-MOBILE USA, INC. 6529 2
EXIANT COMMUNICATIONS LLC 114J 1

Rate Centers

LSAN DA 10 LSAN DA 07 LSAN DA 04 LSAN DA 13 LSAN DA 06 MONTEBELLO LSAN DA 12 LSAN DA 03 LSAN DA 01 LSAN DA 05

Exchange Listings (NXX)

NPA-NXX Carrier Rate Center Type LATA Status
738-200 T-MOBILE USA, INC. LSAN DA 10 Landline active
738-201 ONVOY, LLC - CA LSAN DA 07 Landline active
738-202 T-MOBILE USA, INC. LSAN DA 04 Landline active
738-203 ONVOY, LLC - CA LSAN DA 13 Landline active
738-204 Landline active
738-205 Landline active
738-206 Landline active
738-207 Landline active
738-208 Landline active
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738-210 Landline active
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738-215 Landline active
738-216 Landline active
738-217 Landline active
738-218 Landline active
738-219 Landline active
738-220 Landline active
738-221 Landline active
738-222 ONVOY, LLC - CA LSAN DA 06 Landline active
738-223 Landline active
738-224 Landline active
738-225 Landline active
738-226 Landline active
738-227 Landline active
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738-327 Landline active
738-328 Landline active
738-329 Landline active
738-330 Landline active
738-331 Landline active
738-332 Landline active
738-333 WIDE VOICE, LLC - CA MONTEBELLO Landline active
738-334 Landline active
738-335 Landline active
738-336 Landline active
738-337 Landline active
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738-440 Landline active
738-441 Landline active
738-442 Landline active
738-443 Landline active
738-444 ONVOY, LLC - CA LSAN DA 12 Landline active
738-445 Landline active
738-446 Landline active
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738-524 Landline active
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738-526 Landline active
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738-528 Landline active
738-529 ONVOY, LLC - CA LSAN DA 03 Landline active
738-530 Landline active
738-531 Landline active
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738-660 Landline active
738-661 Landline active
738-662 Landline active
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738-664 Landline active
738-665 Landline active
738-666 ONVOY, LLC - CA MONTEBELLO Landline active
738-667 Landline active
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738-732 Landline active
738-733 Landline active
738-734 Landline active
738-735 Landline active
738-736 Landline active
738-737 Landline active
738-738 EXIANT COMMUNICATIONS LLC LSAN DA 06 Landline active
738-739 Landline active
738-740 Landline active
738-741 Landline active
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738-775 Landline active
738-776 Landline active
738-777 WIDE VOICE, LLC - CA LSAN DA 01 Landline active
738-778 Landline active
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738-800 ONVOY, LLC - CA LSAN DA 04 Landline active
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738-888 WIDE VOICE, LLC - CA LSAN DA 06 Landline 730 active
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738-900 ONVOY, LLC - CA LSAN DA 05 Landline active
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738-995 Landline active
738-996 Landline active
738-997 Landline active
738-998 Landline active
738-999 WIDE VOICE, LLC - CA LSAN DA 04 Landline active

Area code 738 shares its geographic region with the following overlay area codes:

213 323