The Janiszewski surname
In the 2000 U.S. Census, 1,192 people carried this name — #20,642 among all U.S. surnames, about 1 in every 227,300 people counted.
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In Poland’s population register
13,419 people named Janiszewski have a registered home in Poland.
Of the 14,972 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 Masovian.
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 France’s civil register
France’s register of deaths holds 162 people named Janiszewski.
47 of them were born outside France. Those born in France came from 24 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 Janiszewski.
- Janiak 779 · U.S. census
- Janicki 1,964 · U.S. census
- Janiec 289 · U.S. census
- Janik 3,017 · U.S. census
- Janin 133 · U.S. census
- Janis 3,814 · U.S. census
- Jankovic 577 · U.S. census
- Jankowiak 610 · U.S. census
- Jankowski 9,060 · U.S. census
- Janky 107 · U.S. census
- Jannetta 149 · U.S. census
- Janny 130 · U.S. census
When the index is not enough
This page says where Janiszewski 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.