Area codes in Danbury, Connecticut
Danbury, Connecticut uses 2 area codes — 203 and 475. The main Danbury area code is 203.
Area codes serving Danbury
Phone numbers in Danbury are written as ten digits — for example (203) 555-0190 — and fall in the Eastern Time zone.
How Danbury came to have 2 area codes
The original Danbury area code is 203, in service since 1947. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 475 (2009). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Danbury now uses all 2 codes and every local call is dialed with ten digits.
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Nearby cities
- Bridgeport area codes
- New Haven area codes
- White Plains area codes
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- Yonkers area codes
- Mount Vernon area codes
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Frequently asked questions
What is the area code for Danbury?
The main area code for Danbury, Connecticut is 203. Danbury is now served by 2 area codes in total: 203, 475.
How many area codes does Danbury have?
Danbury has 2 area codes: 203, 475.
Why does Danbury have more than one area code?
As Danbury used up the numbers available in its original area code (203, in service since 1947), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Danbury number?
Dial all 10 digits — the area code (203 or 475) 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.