Charleston, South Carolina, is served by primary area code 843 with the 854 overlay. Whether you are calling a Charleston number, verifying an unknown caller, or setting up a new local line, this guide covers every area code that serves the city, how local dialing works, the ZIP codes involved, and the scam-call patterns residents report most often.
Charleston Area Codes at a Glance
| Detail | Information |
|---|---|
| Primary Area Code | 843 |
| Overlay Code | 854 |
| Time Zone | Eastern Time (ET, UTC-5 / UTC-4) |
| Major Counties | Charleston County |
| State | South Carolina |
Area Code Breakdown & Neighborhood Mapping
Charleston sits in the South Carolina Lowcountry, where 843 is the original area code and 854 was later added as an overlay serving the same geographic area. Because the two codes overlap, every local number keeps its own ten-digit identity and newly issued lines may receive either code.
Within the city, 843 covers downtown and the Historic District, the peninsula, West Ashley, James Island, Johns Island, Daniel Island, and the surrounding coastal communities. Nearby communities in the same region include North Charleston, Mount Pleasant, Summerville.
Across South Carolina, 843 connects to the rest of the state through standard long-distance dialing, and every call to or from Charleston follows the same North American Numbering Plan rules used nationwide. Knowing which code covers the city helps you spot out-of-area numbers at a glance and recognize when an incoming call may not be as local as it appears.
Local Dialing Rules & International Calling
Like the rest of the United States, Charleston uses 10-digit dialing, which is mandatory throughout any area served by an overlay. Dial the area code plus the seven-digit number for local calls. For domestic long distance, add a leading 1 (1 + 843 + number). To call Charleston from another country, dial your country’s exit code, then the U.S. country code +1, then the area code and the local number. Mobile users can enter +1 843 directly. Three-digit services such as 911 for emergencies and 988 for the Suicide and Crisis Lifeline are always dialed directly, with no area code required.
Major ZIP Codes in Charleston
Charleston ZIP codes fall mainly in the 29401-29412 and 29492 range, including 29401 (downtown and the peninsula), 29403 and 29405 (the upper peninsula), 29407 (West Ashley), 29412 (James Island), and 29492 (Daniel Island).
Cell Phones & Number Portability
Thanks to federal number portability, a 843 number no longer proves the caller is currently in Charleston. Residents who move away often keep their mobile numbers, and newcomers frequently arrive with codes from other states. New local service is typically assigned a 843 or 854 number, but the reliable habit is to dial all ten digits every time and to judge callers by who they are rather than by the area code they display.
Spam & Scam Call Warnings in Charleston
Charleston residents report the same robocall trends seen across South Carolina. Watch for these patterns:
- Neighbor spoofing: Scam calls that fake a 843 prefix so the number looks local. Screen unfamiliar callers even when the area code matches.
- Utility shutoff threats: Callers posing as the power or water company demanding immediate payment by gift card or wire. Real utilities never work this way.
- Government impersonation: Fake IRS, Social Security, or county “warrant” calls pressuring you to pay to avoid arrest.
- Local angle: Tourism and vacation-rental scams are common in the Lowcountry – be wary of fake booking-confirmation, timeshare, or resort ‘prize’ calls that target visitors and short-term-rental owners.
- Auto-warranty and Medicare pitches: High-volume robocalls seeking personal, financial, or insurance details, often using a recorded voice and a callback number.
Let unknown calls go to voicemail, never share financial information with an inbound caller, and report unwanted calls to the FTC at reportfraud.ftc.gov.
Frequently Asked Questions
What area code does Charleston use?
Charleston uses area code 843, with 854 serving as an overlay across the same area.
Do I have to dial the area code for local calls?
Yes. Charleston uses 10-digit dialing, so include the area code even for calls within the city.
What county is Charleston in?
Charleston is located in Charleston County.
What time zone is Charleston in?
Charleston observes Eastern Time (ET, UTC-5 / UTC-4).
How do I call Charleston from another country?
Dial your exit code, then +1, then 843 and the seven-digit local number.
Does the area code affect the cost of a call?
No. Call costs depend on your calling plan, not on the 843 area code. Most U.S. mobile and landline plans include nationwide calling, so reaching a Charleston number is treated the same as any other domestic call.
Can I keep my phone number if I move to Charleston?
Usually yes. Federal number portability lets you keep an existing mobile number when you relocate, which is why many Charleston residents carry numbers with area codes from other cities or states.
Stay Safe & Explore More
- Verify an unknown caller in our Scam Alerts directory.
- Comparing nationwide numbers? See our Toll-Free Numbers guides.