Area Code 939 – Zip Codes, Time Zone & United States Map

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📞 939 Area Code — Quick Reference
📍 LocationSan Juan, Puerto Rico
🕐 Time ZoneAtlantic (UTC-4)
🗓️ StatusActive — Geographic

When you see 939 on your phone, you’re looking at a call from San Juan, Puerto Rico. Whether you received an unexpected call from this number or you’re trying to figure out where a 939 number is based, this guide covers the exact location, time zone, spam reputation, blocking instructions, and which cities fall under this code.

📍 Where Is the 939 Area Code Located?

The 939 area code is located in Puerto Rico, primarily serving San Juan and the surrounding region. It’s a standard geographic area code under the North American Numbering Plan (NANP). Keep in mind that mobile number portability means someone could carry a 939 number with them after moving — so the code tells you where the number was issued, not necessarily where the person is right now.

939 Area Code — Location Details
State/ProvincePuerto Rico (PR)
Major CitySan Juan
CountryUnited States (+1)
Time ZoneAtlantic (UTC-4)
TypeGeographic — Standard
NANPA StatusActive

🕐 939 Area Code Time Zone

The 939 area code operates in the Atlantic Time Zone (UTC-4). Here’s how it compares to other US time zones:

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 Business hours (good to call)     Early / late hours     Night — do not call
Official Resources: Report Fraud — FTC Do Not Call Registry NANPA Directory
Time ZoneDifference from 939
Eastern Time-1 hour
Central Time-2 hours
Mountain Time-3 hours
Pacific Time-4 hours
💡 Calling Tip: Reach someone in the 939 area between 10 AM – 4 PM their local time for the best chance of an answer. Calls outside those hours are more likely to be screened or ignored.

🛡️ Is 939 Area Code Spam or Scam?

Area code 939 is 100% legitimate — it serves San Juan, Puerto Rico. The problem is that scammers spoof 939 numbers constantly because people trust local-looking calls. The most common 939 scams involve fake utility shutoff threats, vehicle warranty extensions, and Social Security impersonation.

⚠️ Red Flag: If a 939 caller demands immediate payment via gift cards, wire transfer, or crypto — hang up. No legitimate organization uses these methods. Verify by calling the company’s official number directly.

How to verify: Don’t call back the number — look up the official number for whatever organization the caller claimed to represent and call that instead. Google the full 10-digit number in quotes to check if others have reported it as spam.

📵 How to Block 939 Spam Calls & Texts

Block on iPhone

  1. Open Phone → tap Recents
  2. Tap ⓘ next to the 939 spam number
  3. Scroll down → “Block this Caller”
  4. Silence all unknowns: Settings → Phone → Silence Unknown Callers → ON

Block on Android

  1. Open Phone → find the 939 number
  2. Tap ⋮ menu → “Block number”
  3. For broader blocking: Settings → Blocked numbers → Unknown toggle ON

Report Spam

  1. Forward spam texts to 7726 (SPAM)
  2. Report at reportfraud.ftc.gov
  3. Register at donotcall.gov or call 1-888-382-1222

🔍 Who Called from 939? Reverse Lookup

  1. Google the full 10-digit number in quotes — catches ~70% of unknown callers
  2. Check Whitepages.com or Truecaller.com
  3. Search 800notes.com for community reports
  4. No voicemail left? Almost certainly spam — legitimate callers leave messages
⚠️ One-Ring Scam: If a 939 number rings once and hangs up, do NOT call back. This scam connects you to a premium-rate line that charges your bill.

🔗 Nearby Area Codes

CodeLocationTime Zone
787San Juan, Puerto RicoAtlantic

❓ 939 Area Code — FAQ

What state is 939 area code in?
The 939 area code is in Puerto Rico, serving San Juan and surrounding areas.
What city does 939 cover?
939 primarily covers San Juan and nearby communities in Puerto Rico.
Is 939 toll-free?
No. 939 is a geographic area code. Toll-free codes are 800, 833, 844, 855, 866, 877, 888.
What time zone is 939?
Atlantic (UTC-4).
Is 939 a scam?
939 is legitimate — it serves real people in San Juan. But scammers may spoof 939 numbers. Verify suspicious callers independently.
Why do I keep getting 939 calls?
Repeated 939 calls without a known contact are likely robocalls. Use your phone’s Silence Unknown Callers feature.
Can I get a 939 number remotely?
Yes — VoIP services like Google Voice offer 939 numbers regardless of where you live.
Is 939 cell or landline?
939 covers both. US area codes don’t distinguish between mobile and landline.
How do I block 939 calls?
iPhone: Settings → Phone → Silence Unknown Callers. Android: Phone → Settings → Blocked numbers. For area-code blocking, use Truecaller or RoboKiller.

🔗 Related Area Code Guides

Updated April 2026 · Data from NANPA & FCC · areacodess.org/