MK
Mary Kowalski — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Mercer, New Jersey
Our Model Tree links this Mary Kowalski across the 1910 and 1920 US Censuses in Mercer, New Jersey (XGBoost, ~Confirmed) — first a spouse (b.~1880), then head of a 11-person household.
Age 40
b. ~1880
Female
Spouse
Born: Poland
Married
1920 Census Record Details
| Census Year | 1920 |
| Location | Mercer, New Jersey |
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Poland |
| Year of Immigration | 1900 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Additional Details | |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Polish |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
| Township / Ward | Trenton City |
| Est. Birth Year | ~1880 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
11 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Kowalski | Daughter | — | 12 | ~1908 |
| Stella Kowalski | Daughter | — | 8 | ~1912 |
| Sophie Kowalski | Daughter | — | 4 | ~1916 |
| Frank Kowalski | Son | — | 14 | ~1906 |
| Helen Kowalski | Daughter | — | 6 | ~1914 |
| John Kowalski | Son | — | 18 | ~1902 |
| Edward Kowalski | Son | — | 2 | ~1918 |
| John Kowalski | Head | — | 45 | ~1875 |
| Anna Kowalski | Daughter | — | 10 | ~1910 |
| Mary Kowalski | Spouse | — | 40 | ~1880 |
| Joseph Kowalski | Son | — | 16 | ~1904 |
Census Appearances
1910
Lackawanna, New …
Spouse, age 32
Lackawanna, New Jersey · implied b. ~1878 — 47 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Poland |
| Years Married | 12 |
| Children Born | 5 |
| Children Living | 5 |
| Year of Immigration | 1900 |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
1920
Mercer, New …
Spouse, age 40
Mercer, New Jersey · implied b. ~1880 — 11 household members
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Poland |
| Year of Immigration | 1900 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Polish |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Mary Kowalski across 2 US Census years (1910 and 1920) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Kowalski
Spouse · 1920 · age 40 · b. ~1880 · New Jersey
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1920 US Federal Census — Mercer, New Jersey
Open full size
1920 US Federal Census — Mercer, New Jersey
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu1052unit:0793)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frank Kowalski | 48 | Head | Engineer | Austria |
| 2 | Mary Kowalski | 38 | Wife | Laborer | Florida |
| 3 | Frank Kowalski | 20 | Son | — | New Jersey |
| 4 | John Kowalski | 18 | Son | — | New Jersey |
| 5 | Helen Kowalski | 16 | Daughter | — | New Jersey |
| 6 | Edward Kowalski | 5 | Son | — | New Jersey |
| 7 | Edden | 40 | Head | Teamster | New Jersey |
| 8 | Bertha Edden | 39 | Wife | Laborer | New Jersey |
| 9 | John Edden | 18 | Son | Attendant | New Jersey |
| 10 | John Sutka | 45 | Head | — | Lithuania |
| 11 | Mary Sutka | 42 | Wife | — | Lithuania |
| 12 | Mary Sutka | 13 | Daughter | — | New Jersey |
| 13 | John Sutka | 11 | Son | — | New Jersey |
| 14 | Joseph Sutka | 8 | Son | — | New Jersey |
| 15 | Peter Sutka | 5 | Son | — | New Jersey |
| 16 | Anton Sutka | 3 | Son | — | New Jersey |
| 17 | Helen Sutka | 1 | Daughter | — | New Jersey |
| 18 | John Kowalski | 55 | Head | Watchman | Poland |
| 19 | Mary Kowalski | 51 | Wife | — | Poland |
| 20 | John Kowalski | 21 | Son | Cutter | New Jersey |
| 21 | Joseph Kowalski | 18 | Son | — | New Jersey |
| 22 | Helen Kowalski | 16 | Daughter | — | New Jersey |
| 23 | Edward Kowalski | 14 | Son | — | New Jersey |
| 24 | Stanley Kowalski | 12 | Son | — | New Jersey |
| 25 | Frank Kowalski | 10 | Son | — | New Jersey |
| 26 | Mary Kowalski | 8 | Daughter | — | New Jersey |
| 27 | Anna Kowalski | 6 | Daughter | — | New Jersey |
| 28 | Stella Kowalski | 4 | Daughter | — | New Jersey |
| 29 | Sophie Kowalski | 2 | Daughter | — | New Jersey |
| 30 | Helen Kowalski | 1 | Daughter | — | New Jersey |
| 31 | John Kowalski | 35 | Head | Laborer | Poland |
| 32 | Mary Kowalski | 30 | Wife | — | Poland |
| 33 | John Kowalski | 12 | Son | — | New Jersey |
| 34 | Joseph Kowalski | 10 | Son | — | New Jersey |
| 35 | Frank Kowalski | 8 | Son | — | New Jersey |
| 36 | Mary Kowalski | 6 | Daughter | — | New Jersey |
| 37 | Anna Kowalski | 4 | Daughter | — | New Jersey |
| 38 | Stella Kowalski | 2 | Daughter | — | New Jersey |
| 39 | Helen Kowalski | 1 | Daughter | — | New Jersey |
| 40 | John Kowalski | 45 | Head | Laborer | Poland |
| 41 | Mary Kowalski THIS PERSON | 40 | Wife | — | Poland |
| 42 | John Kowalski | 18 | Son | — | New Jersey |
| 43 | Joseph Kowalski | 16 | Son | — | New Jersey |
| 44 | Frank Kowalski | 14 | Son | — | New Jersey |
| 45 | Mary Kowalski | 12 | Daughter | — | New Jersey |
| 46 | Anna Kowalski | 10 | Daughter | — | New Jersey |
| 47 | Stella Kowalski | 8 | Daughter | — | New Jersey |
| 48 | Helen Kowalski | 6 | Daughter | — | New Jersey |
| 49 | Sophie Kowalski | 4 | Daughter | — | New Jersey |
| 50 | Edward Kowalski | 2 | Son | — | New Jersey |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)