Prefix Information
The prefix 503 is part of area code 818 serving Los Angeles, California.
This exchange contains 10,000 possible phone numbers (818-503-0000 through 818-503-9999).
Phone numbers with prefix 503 in area code 818. Location: Los Angeles, California.
The prefix 503 is part of area code 818 serving Los Angeles, California.
This exchange contains 10,000 possible phone numbers (818-503-0000 through 818-503-9999).