Area codes in Jefferson City, Missouri
Jefferson City, Missouri uses 2 area codes — 573 and 235. The main Jefferson City area code is 573.
Area codes serving Jefferson City
Phone numbers in Jefferson City are written as ten digits — for example (573) 555-0190 — and fall in the Central Time zone.
How Jefferson City came to have 2 area codes
The original Jefferson City area code is 573, in service since 1996. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 235 (2024). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Jefferson City now uses all 2 codes and every local call is dialed with ten digits.
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Nearby cities
- St Charles area codes
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Frequently asked questions
What is the area code for Jefferson City?
The main area code for Jefferson City, Missouri is 573. Jefferson City is now served by 2 area codes in total: 573, 235.
How many area codes does Jefferson City have?
Jefferson City has 2 area codes: 573, 235.
Why does Jefferson City have more than one area code?
As Jefferson City used up the numbers available in its original area code (573, in service since 1996), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Jefferson City number?
Dial all 10 digits — the area code (573 or 235) 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.