← Area code 209
209-378 phone numbers
Numbers 209-378-0000 to 209-378-9999 are assigned to Hornitos Tel. Co. in Hornitos, CA.
Not assigned to any carrier: 209-378-0xxx, 209-378-2xxx, 209-378-3xxx, 209-378-4xxx, 209-378-5xxx, 209-378-6xxx, 209-378-7xxx, 209-378-8xxx, 209-378-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.