The Duclos surname
In the 2000 U.S. Census, 2,263 people carried this name — #12,558 among all U.S. surnames, about 1 in every 119,000 people counted.
Free to read. No account, no sign-up.
In France’s civil register
France’s register of deaths holds 5,901 people named Duclos.
98 of them were born outside France. Those born in France came from 91 départements, most often Seine-Maritime.
Where it concentrates, on the mapWhere they were born
Fichier des personnes décédées, INSEE — Licence Ouverte 2.0 · deaths recorded in France since 1970, by place of birth.
In Switzerland’s population statistics
51 people named Duclos live in Switzerland.
They live in 4 of Switzerland’s 26 cantons, most of all in Vaud.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they live today
Swiss Federal Statistical Office (FSO), «Surnames of the permanent resident population by canton», 2025, opendata.swiss · names with fewer than 3 bearers in a canton are not published.
In Belgium’s population register
At least 27 people named Duclos live in Belgium.
Statbel only publishes a name in a municipality when five or more people there share it, so the real number is higher. Most of them live in West Flanders.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they live today
Statbel (Statistics Belgium), family names of the population by municipality, 1 January 2026 — CC BY 4.0.
Nearby in the index
Surnames next to Duclos.
- Duchateau 355 · U.S. census
- Duche 102 · U.S. census
- Duchemin 456 · U.S. census
- Duchene 1,610 · U.S. census
- Duchesne 1,001 · U.S. census
- Duchon 319 · U.S. census
- Duco 160 · U.S. census
- Ducoing 158 · U.S. census
- Ducommun 324 · U.S. census
- Ducos 212 · U.S. census
- Ducote 3,312 · U.S. census
- Ducre 595 · U.S. census
When the index is not enough
This page says where Duclos is.
A volume says what happened to it.
Every page in the index is free and stays free. The Heritage Volume is the long form: the full paper trail, the arms, the crossing — bound, and yours.