Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/CA/DUNCANS-MILLS

Duncans Mills ZIP code, California

The ZIP code for Duncans Mills, CA is 95430, and its area codes are 707 and 369.

USPS city name
1 ZIP code
Population
0
Area codes
707, 369

NANPA lists no telephone rate centre for Duncans Mills itself, so these are the area codes of the nearest one, Monte Rio (1.6 miles). A town on an area-code boundary can differ from its neighbour.

ZIP codes addressed as Duncans Mills

ZIP codes with the USPS city name Duncans Mills
ZIP City Type Population Median income Median home
95430 Duncans Mills , CA Standard 0 — —

Map of Duncans Mills ZIP codes

The ZIP codes of Duncans Mills, CA, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Duncans Mills

Towns near Duncans Mills
TownPopulationDistance
Guerneville 4,100 4.9 mi
Forestville 3,717 8.6 mi
Sebastopol 7,445 12.6 mi
Windsor 26,081 14.1 mi
Healdsburg 11,243 14.9 mi
Larkfield-Wikiup 8,765 16.3 mi
Santa Rosa 177,090 18.5 mi
Rohnert Park 44,575 20.3 mi
Cotati 7,489 20.4 mi
Cloverdale 8,886 23.1 mi
Calistoga 5,111 26.4 mi
Petaluma 59,247 27.3 mi

More nearby: every ZIP code in Sonoma County · California ZIP codes

Cite this page

zipcodes.pro. “Duncans Mills, CA ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/ca/duncans-mills

Underlying data is public domain or openly licensed — sources, vintages and licences.