Area codes in Mount Pleasant, South Carolina
Mount Pleasant, South Carolina uses 2 area codes — 843 and 854. The main Mount Pleasant area code is 843.
Area codes serving Mount Pleasant
Phone numbers in Mount Pleasant are written as ten digits — for example (843) 555-0190 — and fall in the Eastern Time zone.
How Mount Pleasant came to have 2 area codes
The original Mount Pleasant area code is 843, in service since 1998. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 854 (2015). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Mount Pleasant now uses all 2 codes and every local call is dialed with ten digits.
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Frequently asked questions
What is the area code for Mount Pleasant?
The main area code for Mount Pleasant, South Carolina is 843. Mount Pleasant is now served by 2 area codes in total: 843, 854.
How many area codes does Mount Pleasant have?
Mount Pleasant has 2 area codes: 843, 854.
Why does Mount Pleasant have more than one area code?
As Mount Pleasant used up the numbers available in its original area code (843, in service since 1998), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Mount Pleasant number?
Dial all 10 digits — the area code (843 or 854) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.