Area code 939: Puerto Rico
Area code 939 is a US territory area code for Puerto Rico, on Atlantic Standard Time. It has 358 prefixes in service across 75 rate centers, the largest being Bayamon Norte, Santurce and Carolina. It shares its area with 787, so local numbers there can start with any of them. Local calls there take 10 digits.
Local time in area code 939
America/Puerto_Rico
Prefixes in service
358 of 792 possible
75 rate centers
Area code 939 facts
| Location | Puerto Rico, United States |
|---|---|
| Time zone | Atlantic Standard Time |
| Overlays | 787 |
| Overlay of | 787 |
| In service since | September 15, 2001 |
| 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 939?
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 939 rate centers with the most prefixes in service. 63 smaller ones aren't listed.
| Rate center | Prefixes |
|---|---|
| Bayamon Norte | 103 |
| Santurce | 39 |
| Carolina | 16 |
| Ponce | 15 |
| Bayamon Sur | 12 |
| Aguadilla | 11 |
| Caguas | 9 |
| Trujillo Alto | 8 |
| Manati | 7 |
| Cayey | 7 |
| Arecibo | 7 |
| Arroyo | 7 |
Source: NANPA central office code assignments, file dated 10/17/2026. Each prefix holds up to 10,000 numbers.
How do I dial a 939 number?
NANPA's dialling plan for 939: 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 939 | 939-555-0147 |
|---|---|
| From another US or Canadian area code | 1-939-555-0147 |
| From outside North America | +1 939 555 0147 |
| E.164, for CRMs and SMS tools | +19395550147 |
When did area code 939 start?
Area code 939 went into service on September 15, 2001 as an overlay of 787. Today 939 and 787 cover the same area as an overlay, which is why 10-digit dialling is needed for local calls there.
Tools for 939 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 939 number tells you where it was issued, not what it is now.
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Area code 939 questions
- What state or territory is area code 939?
- Area code 939 is in Puerto Rico, United States. Its largest rate centers by number of prefixes are Bayamon Norte, Santurce, Carolina, Ponce and Bayamon Sur.
- What time zone is area code 939 in?
- Atlantic Standard Time.
- What area codes overlay 939?
- 787. 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 939 start?
- Area code 939 went into service on September 15, 2001 as an overlay of 787.
- Is a 939 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 939 have?
- 358 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 Puerto Rico
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.