The Kos surname
In the 2000 U.S. Census, 1,621 people carried this name — #16,360 among all U.S. surnames, about 1 in every 166,700 people counted.
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In Poland’s population register
6,653 people named Kos have a registered home in Poland.
Of the 7,728 in Poland’s national register, these are the ones with a permanent address on file. They live in all 16 of Poland’s voivodeships, most of all in Silesian.
Where it concentrates, on the mapWhere they live today
PESEL register, Ministry of Digital Affairs of Poland (dane.gov.pl) — CC0 · living people by voivodeship of permanent residence, 20 January 2026.
In Switzerland’s population statistics
179 people named Kos live in Switzerland.
They live in 13 of Switzerland’s 26 cantons, most of all in Zurich.
Where it concentrates, on the mapWhere 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 France’s civil register
France’s register of deaths holds 125 people named Kos.
54 of them were born outside France. Those born in France came from 21 départements, most often Pas-de-Calais.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they were born
Fichier des personnes décédées, INSEE — Licence Ouverte 2.0 · deaths recorded in France since 1970, by place of birth.
Nearby in the index
Surnames next to Kos.
- Korczak 240 · U.S. census
- Korkmaz 109 · U.S. census
- Kormann 213 · U.S. census
- Korn 5,328 · U.S. census
- Korner 562 · U.S. census
- Kornmann 166 · U.S. census
- Koscher 128 · U.S. census
- Koscielniak 516 · U.S. census
- Koscielny 165 · U.S. census
- Kosinski 2,589 · U.S. census
- Koslowski 771 · U.S. census
- Kosmala 258 · U.S. census
When the index is not enough
This page says where Kos 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.