551 Area Code — NJ
Area code 551 serves NJ in the Eastern time zone, in service since 2001. The FCC has 83 unwanted-call complaints against 82 different 551 numbers on record. Look up the exact number that called you below.
Most-reported 551 numbers
Ranked by FCC unwanted-call complaints. Click a number for its full report.
551 unwanted-call complaints, last 12 months
Monthly FCC complaint volume against 551 numbers. Spikes usually mark an active robocall campaign cycling through the code.
About area code 551
- Serves
- NJ
- Time zone
- Eastern
- In service since
- 2001-12-29
- Overlay
- Yes — 10-digit dialing
Source: NANPA numbering records, refreshed weekly.
Spam calls from 551? What to know
Seeing repeated missed calls from 551 numbers you don't recognize is the classic signature of neighbor-spoofing robocall campaigns. The caller isn't necessarily in NJ — spoofing software displays whatever digits the campaign chooses. Never call unknown numbers back; look them up first, and report unwanted calls to the FCC to build the public record.
Area code 551 FAQs
Where is area code 551?
Area code 551 serves NJ, in the Eastern time zone. It is part of an overlay complex, so multiple area codes serve the same territory and 10-digit dialing is required. It has been in service since 2001.
Why do I keep getting calls from 551 numbers?
Robocallers use "neighbor spoofing" — displaying a number with a local area code to make you more likely to answer. A call showing area code 551 may not originate from NJ at all. Look up the full 10-digit number on this site to see its complaint history before calling back.
Are 551 numbers safe to call back?
Area codes themselves are neither safe nor unsafe — 551 contains millions of legitimate lines alongside any spoofed or spam numbers. The FCC has logged 83 unwanted-call complaints against 82 distinct 551 numbers in our current data window. Check the specific number's report page before returning a missed call.