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.~1887), then head of a 7-person household.
Age 43
b. ~1887
Female
Spouse
Born: Russia
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 | 43 |
| Marital Status | Married |
| Birthplace | Russia |
| Naturalization Status | Naturalized |
| Year of Immigration | 1907 |
| Age at First Marriage | 22 |
| Father's Birthplace | Russia |
| Mother's Birthplace | Russia |
| Additional Details | |
| Can Read/Write | Yes |
| Mother Tongue | Polish |
| Birth Country | Russia |
| Birthplace (normalized) | russia |
| Township / Ward | Detroit City |
| Est. Birth Year | ~1887 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| George Kowalski | Son | — | 15 | ~1915 |
| Stanley Kowalski | Son | — | 19 | ~1911 |
| Helen Kowalski | Daughter | — | 17 | ~1913 |
| Joseph Kowalski | Son | — | 14 | ~1916 |
| John Kowalski | Son | — | 12 | ~1918 |
| Mary Kowalski | Spouse | — | 43 | ~1887 |
| John Kowalski | Head | — | 43 | ~1887 |
Census Appearances
1930
Wayne, Michigan
Spouse, age 43
Wayne, Michigan · implied b. ~1887 — 7 household members
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Russia |
| Naturalization Status | Naturalized |
| Year of Immigration | 1907 |
| Age at First Marriage | 22 |
| Father's Birthplace | Russia |
| Mother's Birthplace | Russia |
| Can Read/Write | Yes |
| Mother Tongue | Polish |
| Birth Country | Russia |
| Birthplace (normalized) | russia |
1940
Wayne-County, Michigan
Head, age 57
Wayne-County, Michigan · implied b. ~1883 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalska |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 57 |
| Marital Status | Widowed |
| Birthplace | Russia |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Naturalization Status | Naturalized |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Russia |
| Birthplace (normalized) | russia |
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.
Show:
This person
Anchor record
Mary Kowalski
Spouse · 1930 · age 43 · b. ~1887 · Michigan
★ You are viewing this record
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
50 people indexed on this census page (ia:1930:michigancensus00reel1069:0271)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Kowalski | 43 | Head | Drill Press | Russia |
| 2 | Mary Kowalski THIS PERSON | 43 | Wife | — | Russia |
| 3 | Stanley Kowalski | 19 | Son | — | Russia |
| 4 | Helen Kowalski | 17 | Daughter | — | Russia |
| 5 | George Kowalski | 15 | Son | — | Russia |
| 6 | Joseph Kowalski | 14 | Son | — | Russia |
| 7 | John Kowalski | 12 | Son | — | Russia |
| 8 | Lee | 24 | Head | Salesman | Michigan |
| 9 | Lucile Lee | 23 | Wife | — | Michigan |
| 10 | William Swales | 23 | Roomer | Shipper | Michigan |
| 11 | — | None | — | — | — |
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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)