MK
Mary Kowalski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Wayne, Michigan
Our Model Tree links this Mary Kowalski across the 1930 and 1940 US Censuses in Wayne, Michigan (XGBoost, ~Confirmed) — first a spouse (b.~1882), then head of a 11-person household.
Age 48
b. ~1882
Female
Spouse
Born: Germany
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Wayne, Michigan |
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Germany |
| Naturalization Status | Naturalized |
| Year of Immigration | 1892 |
| Age at First Marriage | 19 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Additional Details | |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
| Township / Ward | Detroit City |
| Est. Birth Year | ~1882 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| John Kowalski | Head | — | 51 | ~1879 |
| Agnes Kowalski | Daughter | — | 16 | ~1914 |
| Richard Kowalski | Son | — | 2 | ~1928 |
| Leonard Kowalski | Son | — | 5 | ~1925 |
| John Kowalski | Son | — | 22 | ~1908 |
| Virginia Kowalski | Daughter | — | 11 | ~1919 |
| Raymond Kowalski | Son | — | 13 | ~1917 |
| Edward Kowalski | Son | — | 18 | ~1912 |
| Mary Kowalski | Spouse | — | 48 | ~1882 |
| Robert Kowalski | Son | — | ~1930 | |
| Arthur Kowalski | Son | — | 8 | ~1922 |
Census Appearances
1930
Wayne, Michigan
Spouse, age 48
Wayne, Michigan · implied b. ~1882 — 11 household members
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Germany |
| Naturalization Status | Naturalized |
| Year of Immigration | 1892 |
| Age at First Marriage | 19 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1940
Wayne-County, Michigan
Head, age 58
Wayne-County, Michigan · implied b. ~1882 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Martha |
| Relationship to Head | head |
| Sex | F |
| Color / Race | White |
| Age | 58 |
| Marital Status | Widowed |
| Birthplace | Germany |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Naturalization Status | Naturalized |
| Income (1939) | 0 |
| Highest Grade | 7 |
| 1935 Residence | Same place |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
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 (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Kowalski
Spouse · 1930 · age 48 · b. ~1882 · Michigan
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Wayne, Michigan
Open full size
1930 US Federal Census — Wayne, Michigan
Page Contents
34 people indexed on this census page (ia:1930:michigancensus00reel1048:0296)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marc Czerwinski | 73 | Head | Retired | Poland |
| 2 | Frances Czerwinski | 69 | Wife | — | Poland |
| 3 | Adeline Nowak | 5 | Granddaughter | — | Michigan |
| 4 | Alex Trominski | 53 | Head | Machinist | Poland |
| 5 | Lena Trominski | 40 | Wife | — | Poland |
| 6 | Lena Trominski | 19 | Daughter | — | Michigan |
| 7 | Emma Trominski | 17 | Daughter | — | Michigan |
| 8 | Alex Trominski | 14 | Son | — | Michigan |
| 9 | Walter Schanowicz | 30 | Head | Core Maker | Russia |
| 10 | Stella Schanowicz | 26 | Wife | — | Russia |
| 11 | Walter Schanowicz | 5 | Son | — | Michigan |
| 12 | Edward Schanowicz | 2 | Son | — | Michigan |
| 13 | Albert Kowalski | 45 | Head | Adjuster | Poland |
| 14 | Stella Kowalski | 40 | Wife | — | Poland |
| 15 | Lillian Kowalski | 19 | Daughter | — | Pennsylvania |
| 16 | Helen Kowalski | 14 | Daughter | — | Pennsylvania |
| 17 | Dorothy Kowalski | 7 | Daughter | — | Michigan |
| 18 | John Kowalski | 51 | Head | Teamster | Germany |
| 19 | Mary Kowalski THIS PERSON | 48 | Wife | — | Germany |
| 20 | John Kowalski | 22 | Son | Teamster | Michigan |
| 21 | Edward Kowalski | 18 | Son | Teamster | Michigan |
| 22 | Agnes Kowalski | 16 | Daughter | Cashier | Michigan |
| 23 | Raymond Kowalski | 13 | Son | — | Michigan |
| 24 | Virginia Kowalski | 11 | Daughter | — | Michigan |
| 25 | Arthur Kowalski | 8 | Son | — | Michigan |
| 26 | Leonard Kowalski | 5 | Son | — | Michigan |
| 27 | Richard Kowalski | 2 | Son | — | Michigan |
| 28 | Robert Kowalski | 0 | Son | — | Michigan |
| 29 | Raymond Kowalski | 23 | Head | Instructor | Poland |
| 30 | Irene Kowalski | 21 | Wife | — | Poland |
| 31 | Raymond Kowalski | 0 | Son | — | Michigan |
| 32 | John Kowalski | 45 | Head | Laborer | Poland |
| 33 | Stella Kowalski | 40 | Wife | — | Poland |
| 34 | Leonard Kowalski | 15 | Son | — | Michigan |
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)