310 Area Code: Compton, California
Area code 310 serves Compton, Santa Monica and Beverly Hills, California in the Pacific time zone, in service since 1991. Consumers have filed 6,634 unwanted-call complaints against 4,711 different 310 numbers, 338 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 310 at a glance
- State
- California
- Main cities
- Compton, Santa Monica, Beverly Hills, West Los Angeles, Inglewood, Redondo Beach + 9 more
- County
- Los Angeles County
- Local time
- —Pacific
- In service since
- November 2, 1991
- Split from
- 213
- Overlay code
- 424 (2006)
- Codes split off
- 562 (1997)
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 17 rate centers, 786 prefixes
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Most-reported 310 numbers
Ranked by FTC Do Not Call complaints this month, then all-time FTC and FCC complaints. Only numbers with enough complaints for a full report page are listed. Click one for what it was reported for and where.
What calls from 310 numbers are about
1,054 FTC Do Not Call complaints about 310 numbers since Jul 24. The most common named subject is impostor calls (people pretending to be a government agency, a business or family), at 9% of complaints (51% of those were recorded messages). Overall, 56% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified42240%
- Dropped call / no message25524%
- No subject given929%
- Impostor (government, business, family)929%
- Debt reduction787%
- Medical & prescriptions374%
- Home improvement & cleaning273%
FCC complaints by call type, last 2 years
- Prerecorded Voice22460%
- Live Voice11631%
- Text Message329%
Live-voice calls are from a person; prerecorded calls are robocalls.
When 310 spam calls come in
32% of complaints that give a call time describe calls between 9am and 12pm. 94% came Monday to Friday, most on Tuesdays, the pattern of call-center robocall campaigns that run on business hours. Times are as consumers reported them to the FTC.
By hour of the day
By day of the week
Is it getting worse?
332 FTC complaints about 310 numbers in the last four weeks, down 1% on the four weeks before. FCC complaints about 310 numbers peaked in 2016 (1,000); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
FTC complaints per week
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
Who gets these calls
65% of the FTC complaints about 310 numbers came from people whose own phone number also starts with 310, and 83% from California. Calls that look local to the person receiving them are the signature of neighbor spoofing: robocallers display a number from your own area code because you're more likely to answer.
Where complainants live
- California87583%
- Ohio151%
- Arizona141%
- Florida121%
- Texas101%
What people with 310 numbers report
People whose own number starts with 310 filed 6,098 FTC complaints since Jul 24. 11% were about calls showing another 310 number. The most common named subject was debt-relief pitches.
Area codes on the calls they reported
- 310 (same code)68911%
- 4242684%
- 833 (toll-free)2504%
- 866 (toll-free)2374%
- 877 (toll-free)2214%
Busiest 310 prefixes this month
FTC complaints in the last 30 days, grouped by the first six digits. When one prefix collects complaints about many different numbers, a campaign is usually cycling through that block. The carrier is who NANPA assigned the prefix to, not who made the calls.
| Prefix | Complaints | Numbers | Carrier | Exchange |
|---|---|---|---|---|
| (310) 731-xxxx | 26 | 26 | Onvoy (Sinch) | San Pedro |
| (310) 504-xxxx | 14 | 14 | Peerless Network | Redondo Beach |
| (310) 907-xxxx | 12 | 10 | MCImetro (Verizon Business) | Santa Monica |
| (310) 361-xxxx | 12 | 4 | Onvoy (Sinch) | Compton |
| (310) 758-xxxx | 8 | 8 | Onvoy (Sinch) | San Pedro |
Carriers operating in 310
NANPA has assigned 786 310 prefixes (NPA-NXX central-office codes) across 17 rate centers: 30% to wireless carriers, 70% to landline and VoIP operators; 45% are pooled blocks shared by several carriers. 1 prefix was assigned in the last 12 months (newest 2025-11-20). The carrier holding a prefix is who the number was issued through. It says nothing about who is calling, since caller ID is routinely spoofed.
| Carrier | Type | Prefixes | Rate centers | Newest assignment |
|---|---|---|---|---|
| Pacific Bell (AT&T) | Incumbent landline (ILEC) | 249(32%) | 11 | 2005-02-23 |
| Frontier Communications | Incumbent landline (ILEC) | 137(17%) | 5 | — |
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 68(9%) | 10 | 2017-01-16 |
| T-Mobile USA | Wireless | 58(7%) | 14 | 2024-02-14 |
| Verizon Wireless (Cellco Partnership) | Wireless | 56(7%) | 9 | 2013-01-14 |
| MCImetro (Verizon Business) | Competitive / VoIP (CLEC) | 27(3%) | 14 | — |
| Spok, INC. | Wireless | 24(3%) | 4 | — |
| U.S. Telepacific CORP. dba Tpx Communications | Competitive / VoIP (CLEC) | 24(3%) | 14 | — |
| Level 3 (Lumen) | Competitive / VoIP (CLEC) | 22(3%) | 13 | 2012-08-13 |
| Teleport Communications America, LLC | Competitive / VoIP (CLEC) | 20(3%) | 11 | 2020-08-28 |
| MCImetro (Verizon Business) | Competitive / VoIP (CLEC) | 19(2%) | 13 | 2005-09-29 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 17(2%) | 9 | 2025-11-20 |
Largest rate centers (exchanges) by prefixes: Compton (168), Santa Monica (138), Beverly Hills (113), West Los Angeles (69), Inglewood (49), Redondo Beach (44), El Segundo (39), Culver City (36). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 310 numbers
Before you call back
- Impostor (government, business, family) is the top named complaint here. Hang up and call the agency, bank or relative back on a number you already know. Government agencies don't demand payment by gift card, wire transfer or crypto. Read about Social Security impostor calls and fake bank fraud calls.
- Look up the full number above. A missed call from 310 with no voicemail is usually a robocall; anyone who needs you will leave a message.
- If it looks like a neighbor's number, it may be spoofed. See calls from your own area code.
- Block repeat callers: iPhone, Android, or your carrier's free filter (Verizon, AT&T, T-Mobile).
Report it in California
- Unwanted sales calls and robocalls: donotcall.gov (FTC). Scams and fraud: ReportFraud.ftc.gov.
- Spoofing, texts and call-blocking problems: FCC consumer complaints.
- State complaints: California Attorney General.
- California formally adopted the FTC's National Do Not Call Registry as its own state list rather than running a separate one, so a single free registration at donotcall.gov covers you. State authorities can still enforce against telemarketers who ignore it, in addition to any federal penalty.
Your FTC and FCC reports are published (without your name or number) in the datasets this page is built from. How to report unwanted calls.
Area code 310: questions answered from the data
Where is area code 310?
Area code 310 serves Compton, Santa Monica and Beverly Hills, California, covering Los Angeles County. It has been in service since November 2, 1991. It was split from area code 213.
What time zone is area code 310 in?
Area code 310 is in the Pacific time zone (UTC−8, or UTC−7 during daylight saving time). The current local time is shown at the top of this page.
Which area codes overlay 310?
424 (in service 2006) serves the same area as 310. New numbers there can be issued with any of these codes, and local calls need all 10 digits. A spoofed call can display any of them.
What are calls from 310 numbers usually about?
Since Jul 24, consumers filed 1,054 FTC Do Not Call complaints about 310 numbers. The most common named subject was impostor calls (people pretending to be a government agency, a business or family): 9% of complaints, 51% of them recorded messages. Across all subjects, 56% of callers who answered the question said the call was a robocall.
When do 310 spam calls happen?
32% of the complaints that give a call time describe calls between 9am and 12pm, and 94% came on weekdays, most often on Tuesday. Times are as consumers reported them.
Are calls from 310 numbers really local?
Not necessarily. 65% of the FTC complaints about 310 numbers came from people whose own phone number also starts with 310, and 83% from California. Calls that look local to the person receiving them are the signature of neighbor spoofing: robocallers display a number from your own area code because you're more likely to answer.
Are 310 robocalls increasing?
In the four weeks to Oct 20, consumers filed 332 FTC complaints about 310 numbers, 1% fewer than the four weeks before.
How do I report a 310 scam call in California?
Report unwanted sales calls and robocalls to the FTC at donotcall.gov, and scams to ReportFraud.ftc.gov. The FCC takes complaints at consumercomplaints.fcc.gov. In California, the California Attorney General also handles consumer complaints about scam calls. Reports feed the public data this page is built from.
Overlay and nearby area codes
Sources: FTC Do Not Call complaints (unverified consumer reports), published every weekday and available here from Jul 24; FCC Consumer Complaint Data, public record, imported nightly; NANPA numbering records. A number appearing here means consumers reported calls that displayed it. Caller ID can be spoofed.