Area code 318: Louisiana
Area code 318 is a US state area code for Louisiana, on Central Time. It has 761 prefixes in service across 118 rate centers, the largest being Shreveport, Monroe and Alexandria. It shares its area with 457, so local numbers there can start with any of them. Local calls there take 10 digits.
Local time in area code 318
America/Chicago
Prefixes in service
761 of 792 possible
118 rate centers
Area code 318 facts
| Location | Louisiana, United States |
|---|---|
| Time zone | Central Time |
| Overlays | 457 |
| In service since | January 1, 1957 |
| Local calls | 10 digits; toll calls 1 + 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
Which cities and towns use area code 318?
NANPA records each prefix against a rate center, the local billing area a number belongs to, usually named after its main town. These are the 318 rate centers with the most prefixes in service. 106 smaller ones aren't listed.
| Rate center | Prefixes |
|---|---|
| Shreveport | 172 |
| Monroe | 90 |
| Alexandria | 60 |
| Ruston | 20 |
| Natchitoches | 19 |
| Minden | 13 |
| Bastrop | 12 |
| Marksville | 11 |
| Winnfield | 9 |
| Oakdale | 9 |
| Winnsboro | 8 |
| Rayville | 8 |
Source: NANPA central office code assignments, file dated 10/17/2026. Each prefix holds up to 10,000 numbers.
How do I dial a 318 number?
NANPA's dialling plan for 318: local calls inside the code take 10 digits, toll calls 1 + 10 digits. From another area code, dial 1 first. From abroad, use +1. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 318 | 318-555-0147 |
|---|---|
| From another US or Canadian area code | 1-318-555-0147 |
| From outside North America | +1 318 555 0147 |
| E.164, for CRMs and SMS tools | +13185550147 |
When did area code 318 start?
Area code 318 went into service on January 1, 1957. Today 318 and 457 cover the same area as an overlay, which is why 10-digit dialling is needed for local calls there.
Tools for 318 numbers
- Area code lookup
Look up any code or a whole list of numbers, or find the codes for a state or city.
- Area code time zone
Local time for a list of numbers, with a callable-now flag.
- NPA-NXX lookup
Rate center and state for one prefix, a level below the area code.
- TCPA calling hours checker
Whether it's inside the federal 8 a.m. to 9 p.m. calling window there now.
Next step
A 318 number tells you where it was issued, not what it is now.
Mobiles, landlines and VoIP lines share area codes, and numbers move between carriers. A live line-type and carrier lookup on every number in your list says which is which, and that decides which calling and texting rules apply. It's in the Email + Phone plan.
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Area code 318 questions
- What state is area code 318?
- Area code 318 is in Louisiana, United States. Its largest rate centers by number of prefixes are Shreveport, Monroe, Alexandria, Ruston and Natchitoches.
- What time zone is area code 318 in?
- Central Time.
- What area codes overlay 318?
- 457. An overlay adds a new code to the same area instead of splitting it, so neighbours can have different area codes and local calls need 10 digits.
- When did area code 318 start?
- Area code 318 went into service on January 1, 1957.
- Is a 318 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
- How many phone numbers does area code 318 have?
- 761 of its 792 possible prefixes are in service, and each prefix holds up to 10,000 numbers. That counts prefixes assigned to carriers, not numbers in use.
Other area codes in Louisiana
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Prefixes and rate centers: NANPA central office code assignments, 10/17/2026. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.