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 daughter (b.~1898), then head of a 7-person household.
Age 22
b. ~1898
Female
Daughter
Born: Poland
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Mercer, New Jersey |
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Poland |
| Year of Immigration | 1912 |
| 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 |
| Year of Naturalization | 1918 |
| Birthplace (normalized) | poland |
| Township / Ward | Trenton City |
| Est. Birth Year | ~1898 |
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.
7 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Frank Kowalski | Son | — | 17 | ~1903 |
| Mary Kowalski | Spouse | — | 46 | ~1874 |
| John Kowalski | Head | — | 48 | ~1872 |
| Alexander Kowalski | Son | — | 19 | ~1901 |
| Josephine Kowalski | Daughter | — | 15 | ~1905 |
| John Kowalski | Son | — | 20 | ~1900 |
| Mary Kowalski | Daughter | — | 22 | ~1898 |
Census Appearances
1910
Mercer, New …
Daughter, age 15
Mercer, New Jersey · implied b. ~1895 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Poland |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
1920
Mercer, New …
Daughter, age 22
Mercer, New Jersey · implied b. ~1898 — 7 household members
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Poland |
| Year of Immigration | 1912 |
| 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 |
| Year of Naturalization | 1918 |
| 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 Mercer, New Jersey, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Kowalski
Daughter · 1920 · age 22 · b. ~1898 · New Jersey
★ You are viewing this record
Sibling
Frank Kowalski
Sibling · 1920 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alexander Kowalski
Sibling · 1920 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Kowalski
Sibling · 1920 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Kowalski
Sibling · 1920 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
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
100 people indexed on this census page (ia:1920:14thcensusofpopu1052unit:0424)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Kowalski | 48 | Head | — | Poland |
| 2 | Mary Kowalski | 46 | Wife | — | Poland |
| 3 | Mary Kowalski THIS PERSON | 22 | Daughter | — | Poland |
| 4 | John Kowalski | 20 | Son | Wire Drawer | Poland |
| 5 | Alexander Kowalski | 19 | Son | Rope Maker | New Jersey |
| 6 | Frank Kowalski | 17 | Son | Rope Maker | New Jersey |
| 7 | Josephine Kowalski | 15 | Daughter | Laborer | New Jersey |
| 8 | Ignatz Wojcik | 31 | Head | Presser | Poland |
| 9 | Caroline Wojcik | 25 | Wife | — | Poland |
| 10 | Josephine Wojcik | 3 | Daughter | — | New Jersey |
| 11 | Alexander Wojcik | 1 | Son | — | New Jersey |
| 12 | John Kovacs | 37 | Head | Core Maker | Slovakia |
| 13 | Mary Kovacs | 35 | Wife | — | Slovakia |
| 14 | John Kovacs | 13 | Son | Laborer | New Jersey |
| 15 | Mary Kovacs | 12 | Daughter | — | New Jersey |
| 16 | Anna Kovacs | 10 | Daughter | — | New Jersey |
| 17 | Joseph Kovacs | 9 | Son | — | New Jersey |
| 18 | Helen Kovacs | 7 | Daughter | — | New Jersey |
| 19 | Julia Kovacs | 5 | Daughter | — | New Jersey |
| 20 | Elizabeth Kovacs | 3 | Daughter | — | New Jersey |
| 21 | Stephen Kovacs | 1 | Son | — | New Jersey |
| 22 | Andrew Szymanski | 37 | Head | Wire Drawer | Slovakia |
| 23 | Mary Szymanski | 33 | Wife | Core Maker | Slovakia |
| 24 | Mary Szymanski | 12 | Daughter | — | New Jersey |
| 25 | Andrew Szymanski | 10 | Son | — | New Jersey |
| 26 | Joseph Szymanski | 8 | Son | — | New Jersey |
| 27 | Helen Szymanski | 6 | Daughter | — | New Jersey |
| 28 | Anna Szymanski | 4 | Daughter | — | New Jersey |
| 29 | Stephen Szymanski | 2 | Son | — | New Jersey |
| 30 | John Szymanski | 1 | Son | — | New Jersey |
| 31 | Stephen Kovacs | 43 | Head | Laborer | Slovakia |
| 32 | Mary Kovacs | 37 | Wife | — | Slovakia |
| 33 | Mary Kovacs | 15 | Daughter | — | New Jersey |
| 34 | Stephen Kovacs | 13 | Son | — | New Jersey |
| 35 | Anna Kovacs | 11 | Daughter | — | New Jersey |
| 36 | Helen Kovacs | 9 | Daughter | — | New Jersey |
| 37 | John Kovacs | 7 | Son | — | New Jersey |
| 38 | Joseph Kovacs | 5 | Son | — | New Jersey |
| 39 | Elizabeth Kovacs | 3 | Daughter | — | New Jersey |
| 40 | Andrew Kovacs | 1 | Son | — | New Jersey |
| 41 | John Szymanski | 30 | Head | Laborer | Slovakia |
| 42 | Mary Szymanski | 28 | Wife | — | Slovakia |
| 43 | Mary Szymanski | 7 | Daughter | — | New Jersey |
| 44 | John Szymanski | 5 | Son | — | New Jersey |
| 45 | Joseph Szymanski | 3 | Son | — | New Jersey |
| 46 | Stephen Szymanski | 1 | Son | — | New Jersey |
| 47 | Stephen Kovacs | 34 | Head | Wire Drawer | Slovakia |
| 48 | Mary Kovacs | 33 | Wife | — | Slovakia |
| 49 | Mary Kovacs | 12 | Daughter | — | New Jersey |
| 50 | Stephen Kovacs | 10 | Son | — | New Jersey |
| 51 | Anna Kovacs | 8 | Daughter | — | New Jersey |
| 52 | John Kovacs | 6 | Son | — | New Jersey |
| 53 | Joseph Kovacs | 4 | Son | — | New Jersey |
| 54 | Helen Kovacs | 2 | Daughter | — | New Jersey |
| 55 | Elizabeth Kovacs | 1 | Daughter | — | New Jersey |
| 56 | Stephen Szymanski | 35 | Head | Laborer | Slovakia |
| 57 | Mary Szymanski | 33 | Wife | — | Slovakia |
| 58 | Mary Szymanski | 12 | Daughter | — | New Jersey |
| 59 | Stephen Szymanski | 10 | Son | — | New Jersey |
| 60 | Anna Szymanski | 8 | Daughter | — | New Jersey |
| 61 | John Szymanski | 6 | Son | — | New Jersey |
| 62 | Joseph Szymanski | 4 | Son | — | New Jersey |
| 63 | Helen Szymanski | 2 | Daughter | — | New Jersey |
| 64 | Elizabeth Szymanski | 1 | Daughter | — | New Jersey |
| 65 | Stephen Kovacs | 35 | Head | Laborer | Slovakia |
| 66 | Mary Kovacs | 33 | Wife | — | Slovakia |
| 67 | Mary Kovacs | 12 | Daughter | — | New Jersey |
| 68 | Stephen Kovacs | 10 | Son | — | New Jersey |
| 69 | Anna Kovacs | 8 | Daughter | — | New Jersey |
| 70 | John Kovacs | 6 | Son | — | New Jersey |
| 71 | Joseph Kovacs | 4 | Son | — | New Jersey |
| 72 | Helen Kovacs | 2 | Daughter | — | New Jersey |
| 73 | Elizabeth Kovacs | 1 | Daughter | — | New Jersey |
| 74 | Stephen Szymanski | 35 | Head | Laborer | Slovakia |
| 75 | Mary Szymanski | 33 | Wife | — | Slovakia |
| 76 | Mary Szymanski | 12 | Daughter | — | New Jersey |
| 77 | Stephen Szymanski | 10 | Son | — | New Jersey |
| 78 | Anna Szymanski | 8 | Daughter | — | New Jersey |
| 79 | John Szymanski | 6 | Son | — | New Jersey |
| 80 | Joseph Szymanski | 4 | Son | — | New Jersey |
| 81 | Helen Szymanski | 2 | Daughter | — | New Jersey |
| 82 | Elizabeth Szymanski | 1 | Daughter | — | New Jersey |
| 83 | Stephen Kovacs | 35 | Head | Laborer | Slovakia |
| 84 | Mary Kovacs | 33 | Wife | — | Slovakia |
| 85 | Mary Kovacs | 12 | Daughter | — | New Jersey |
| 86 | Stephen Kovacs | 10 | Son | — | New Jersey |
| 87 | Anna Kovacs | 8 | Daughter | — | New Jersey |
| 88 | John Kovacs | 6 | Son | — | New Jersey |
| 89 | Joseph Kovacs | 4 | Son | — | New Jersey |
| 90 | Helen Kovacs | 2 | Daughter | — | New Jersey |
| 91 | Elizabeth Kovacs | 1 | Daughter | — | New Jersey |
| 92 | Stephen Szymanski | 35 | Head | Laborer | Slovakia |
| 93 | Mary Szymanski | 33 | Wife | — | Slovakia |
| 94 | Mary Szymanski | 12 | Daughter | — | New Jersey |
| 95 | Stephen Szymanski | 10 | Son | — | New Jersey |
| 96 | Anna Szymanski | 8 | Daughter | — | New Jersey |
| 97 | John Szymanski | 6 | Son | — | New Jersey |
| 98 | Joseph Szymanski | 4 | Son | — | New Jersey |
| 99 | Helen Szymanski | 2 | Daughter | — | New Jersey |
| 100 | Elizabeth Szymanski | 1 | Daughter | — | New Jersey |
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)