The Loos surname
In the 2000 U.S. Census, 4,216 people carried this name — #7,289 among all U.S. surnames, about 1 in every 64,100 people counted.
Free to read. No account, no sign-up.
In Belgium’s population register
At least 1,844 people named Loos 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 Limburg.
Where it concentrates, on the mapWhere they live today
Statbel (Statistics Belgium), family names of the population by municipality, 1 January 2026 — CC BY 4.0.
In France’s civil register
France’s register of deaths holds 513 people named Loos.
35 of them were born outside France. Those born in France came from 37 départements, most often Bas-Rhin.
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
100 people named Loos live in Switzerland.
They live in 13 of Switzerland’s 26 cantons, most of all in Zurich.
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 Poland’s population register
48 people named Loos have a registered home in Poland.
Of the 72 in Poland’s national register, these are the ones with a permanent address on file. They live in 8 of Poland’s 16 voivodeships, most of all in Lesser Poland.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where 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.
Nearby in the index
Surnames next to Loos.
- Longo 12,122 · U.S. census
- Longobardi 730 · U.S. census
- Loo 3,237 · U.S. census
- Loock 309 · U.S. census
- Loof 161 · U.S. census
- Loor 628 · U.S. census
- Loose 2,298 · U.S. census
- Lootens 382 · U.S. census
- Loots 259 · U.S. census
- Lopes 16,029 · U.S. census
- Lopez 621,536 · U.S. census
- Lopinto 516 · U.S. census
When the index is not enough
This page says where Loos 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.