MK
Mary Kowalski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Hudson, New Jersey
Our Model Tree links this Mary Kowalski across the 1920 and 1930 US Censuses in Hudson, New Jersey (XGBoost, ~Confirmed) — first a daughter (b.~1920), then head of a 10-person household.
Age 10
b. ~1920
Female
Daughter
Born: New Jersey
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Hudson, New Jersey |
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Jersey City |
| Est. Birth Year | ~1920 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Nellie Kowalski | Daughter | — | ~1930 | |
| Edward Kowalski | Son | — | 4 | ~1926 |
| Mary Kowalski | Daughter | — | 10 | ~1920 |
| Mary Kowalski | Spouse | — | 33 | ~1897 |
| Helen Kowalski | Daughter | — | 12 | ~1918 |
| Joseph Kowalski | Son | — | 1 | ~1929 |
| Sophie Kowalski | Daughter | — | 8 | ~1922 |
| John Kowalski | Head | — | 38 | ~1892 |
| Frank Kowalski | Son | — | 6 | ~1924 |
| John Kowalski | Son | — | 14 | ~1916 |
Census Appearances
1920
Middlesex, New …
Daughter, age
Middlesex, New Jersey · implied b. ~1920 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Hudson, New …
Daughter, age 10
Hudson, New Jersey · implied b. ~1920 — 10 household members
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 (1920 and 1930) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Kowalski
Daughter · 1930 · age 10 · b. ~1920 · New Jersey
★ You are viewing this record
Sibling
Frank Kowalski
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sophie Kowalski
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Kowalski
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nellie Kowalski
Sibling · 1930 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Kowalski
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Kowalski
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Kowalski
Sibling · 1930 · age 1
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
1930 US Federal Census — Hudson, New Jersey
Open full size
1930 US Federal Census — Hudson, New Jersey
Page Contents
42 people indexed on this census page (ia:1930:newjerseycensus00reel1385:0791)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 59 | Charles Martin | 32 | Head | Clerk | Massachusetts |
| 60 | Mary Martin | 32 | Wife | — | Portugal |
| 61 | Charles Martin | 3 | Son | — | Massachusetts |
| 62 | Mary Martin | 0 | Daughter | — | New Jersey |
| 63 | John Martin | 19 | Brother | Laborer | Italy |
| 64 | Joseph Martin | 21 | Brother | Laborer | Italy |
| 65 | Mary Martin | 18 | Sister | — | Italy |
| 66 | Rose Martin | 16 | Sister | Operator | Italy |
| 67 | Anna Martin | 14 | Sister | — | Italy |
| 68 | Jennie Martin | 12 | Sister | — | Italy |
| 69 | Frank Martin | 10 | Brother | — | Italy |
| 70 | Anthony Martin | 8 | Brother | — | Italy |
| 71 | Theresa Martin | 6 | Sister | — | Italy |
| 72 | Josephine Martin | 4 | Sister | — | Italy |
| 73 | John Toman | 41 | Head | Laborer | Poland |
| 74 | Mary Toman | 43 | Wife | Operator | Poland |
| 75 | John Toman | 11 | Son | — | Poland |
| 76 | Edward Toman | 9 | Son | — | Poland |
| 77 | Mary Toman | 7 | Daughter | — | Poland |
| 78 | Stanley Toman | 5 | Son | — | Poland |
| 79 | Helen Toman | 2 | Daughter | — | Poland |
| 80 | John Moskal | 32 | Head | Laborer | Poland |
| 81 | Nellie Moskal | 24 | Wife | — | Poland |
| 82 | John Moskal | 6 | Son | — | New Jersey |
| 83 | Frank Moskal | 4 | Son | — | New Jersey |
| 84 | Mary Moskal | 2 | Daughter | — | New Jersey |
| 85 | Edward Moskal | 1 | Son | — | New Jersey |
| 86 | Frank Petroski | 30 | Head | Dishwasher | Poland |
| 87 | Helen Petroski | 30 | Wife | — | Poland |
| 88 | Peter Petroski | 17 | Son | Laborer | New Jersey |
| 89 | Mary Petroski | 11 | Daughter | — | New Jersey |
| 90 | John Petroski | 8 | Son | — | New Jersey |
| 91 | John Kowalski | 38 | Head | Laborer | Poland |
| 92 | Mary Kowalski | 33 | Wife | — | Poland |
| 93 | John Kowalski | 14 | Son | — | New Jersey |
| 94 | Helen Kowalski | 12 | Daughter | — | New Jersey |
| 95 | Mary Kowalski THIS PERSON | 10 | Daughter | — | New Jersey |
| 96 | Sophie Kowalski | 8 | Daughter | — | New Jersey |
| 97 | Frank Kowalski | 6 | Son | — | New Jersey |
| 98 | Edward Kowalski | 4 | Son | — | New Jersey |
| 99 | Joseph Kowalski | 1 | Son | — | New Jersey |
| 100 | Nellie Kowalski | 0 | Daughter | — | New Jersey |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)