The Mastalerz surname
In the 2010 U.S. Census, 254 people carried this name — #75,799 among all U.S. surnames, about 1 in every 1,111,100 people counted. About the same as in 2000 (255).
In Poland’s population register
3,965 people named Mastalerz have a registered home in Poland.
Of the 4,378 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 Łódź.
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 57 people named Mastalerz.
24 of them were born outside France. Those born in France came from 12 départements, most often Moselle.
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 Mastalerz.
- Masson 2,813 · U.S. census
- Massone 128 · U.S. census
- Massoni 467 · U.S. census
- Massucco 164 · U.S. census
- Massy 240 · U.S. census
- Mast 15,932 · U.S. census
- Mastin 4,085 · U.S. census
- Maston 1,878 · U.S. census
- Mastrangelo 2,482 · U.S. census
- Mastroianni 1,977 · U.S. census
- Mastrosimone 258 · U.S. census
- Masure 137 · U.S. census
When the index is not enough
This page says where Mastalerz 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.