Duncans Mills CA ZIP Code
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Duncans Mills city is located in California State, Sonoma County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Duncans Mills CA zip code by its streets and block numbers if we have some of the Duncans Mills streets loaded in our website
Duncans Mills Area Code is 707 and Time Zone is Pacific (GMT -08:00).
Duncans Mills Zip Code - California
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Duncans Mills City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Duncans Mills ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Duncans Mills, California.
The Duncans Mills Zip Code is 95430.
If you want to send a mail to Duncans Mills City, you should use the 95430 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Duncans Mills ZIP code system that it called ZIP+4, often called "plus-four codes", "add-on codes", or "add ons". A ZIP+4 code uses the basic 95430 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Duncans Mills city block, a group of apartments, an individual high-volume receiver of mail or any other unit that could use an extra identifier to aid in efficient mail sorting and delivery in California.