Prefix Information
The prefix 503 is part of area code 281 serving Houston, Texas.
This exchange contains 10,000 possible phone numbers (281-503-0000 through 281-503-9999).
Phone numbers with prefix 503 in area code 281. Location: Houston, Texas.
The prefix 503 is part of area code 281 serving Houston, Texas.
This exchange contains 10,000 possible phone numbers (281-503-0000 through 281-503-9999).