JK
John Kowalski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Wayne, Michigan
Our Model Tree links this John Kowalski across the 1930 and 1940 US Censuses in Wayne, Michigan (XGBoost, ~Confirmed) — first a son (b.~1916), then head of a 11-person household.
Age 14
b. ~1916
Male
Son
Born: Michigan
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Wayne, Michigan |
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Township / Ward | Detroit City |
| Est. Birth Year | ~1916 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Helen Kowalski | Daughter | — | 16 | ~1914 |
| Florence Kowalski | Daughter | — | 6 | ~1924 |
| Raymond Kowalski | Son | — | 8 | ~1922 |
| Elizabeth Kowalski | Daughter | — | 4 | ~1926 |
| Teddy Kowalski | Son | — | 20 | ~1910 |
| John Kowalski | Son | — | 14 | ~1916 |
| Stella Kowalski | Spouse | — | 43 | ~1887 |
| Mary Kowalski | Daughter | — | 18 | ~1912 |
| Edward Kowalski | Son | — | 12 | ~1918 |
| Leo Kowalski | Son | — | 10 | ~1920 |
| John Kowalski | Head | — | 45 | ~1885 |
Census Appearances
1930
Wayne, Michigan
Son, age 14
Wayne, Michigan · implied b. ~1916 — 11 household members
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Wayne-County, Michigan
Son, age 24
Wayne-County, Michigan · implied b. ~1916 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Joe |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Occupation | Helper |
| Industry | Auto factory |
| Class of Worker | PW |
| Hours Worked | 38 |
| Income (1939) | 400 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 John Kowalski across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Kowalski
Son · 1930 · age 14 · b. ~1916 · Michigan
★ You are viewing this record
Sibling
Raymond Kowalski
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Kowalski
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Kowalski
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Teddy Kowalski
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Kowalski
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Kowalski
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Kowalski
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Kowalski
Sibling · 1930 · age 4
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 — Wayne, Michigan
Open full size
1930 US Federal Census — Wayne, Michigan
Page Contents
50 people indexed on this census page (ia:1930:michigancensus00reel1048:0302)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Kowalski | 45 | Head | Salesman | Poland |
| 2 | Stella Kowalski | 43 | Wife | — | Poland |
| 3 | Teddy Kowalski | 20 | Son | Machinist | Michigan |
| 4 | Mary Kowalski | 18 | Daughter | Feeder | Michigan |
| 5 | Helen Kowalski | 16 | Daughter | Ironer | Michigan |
| 6 | John Kowalski THIS PERSON | 14 | Son | — | Michigan |
| 7 | Edward Kowalski | 12 | Son | — | Michigan |
| 8 | Leo Kowalski | 10 | Son | — | Michigan |
| 9 | Raymond Kowalski | 8 | Son | — | Michigan |
| 10 | Florence Kowalski | 6 | Daughter | — | Michigan |
| 11 | Elizabeth Kowalski | 4 | Daughter | — | Michigan |
| 12 | George Funk | 34 | Head | Mechanic | South Carolina |
| 13 | Edna Funk | 31 | Wife | — | South Carolina |
| 14 | Thelma Funk | 12 | Daughter | — | South Carolina |
| 15 | George Funk | 10 | Son | Mechanic | South Carolina |
| 16 | James Funk | 8 | Son | — | Georgia |
| 17 | Florence Funk | 6 | Daughter | — | South Carolina |
| 18 | William Funk | 4 | Son | — | Michigan |
| 19 | Robert Funk | 2 | Son | — | Michigan |
| 20 | Betty Funk | 1 | Daughter | — | Michigan |
| 21 | Richard Funk | 0 | Son | — | Michigan |
| 22 | Mary Funk | 0 | Daughter | — | Michigan |
| 23 | Frank Kowalski | 45 | Head | Laborer | Poland |
| 24 | Victoria Kowalski | 43 | Wife | — | Poland |
| 25 | Frank Kowalski | 20 | Son | — | Michigan |
| 26 | John Kowalski | 18 | Son | — | Michigan |
| 27 | Edward Kowalski | 16 | Son | — | Michigan |
| 28 | Leo Kowalski | 14 | Son | — | Michigan |
| 29 | Raymond Kowalski | 12 | Son | — | Michigan |
| 30 | Florence Kowalski | 10 | Daughter | — | Michigan |
| 31 | Elizabeth Kowalski | 8 | Daughter | — | Michigan |
| 32 | Richard Kowalski | 6 | Son | — | Michigan |
| 33 | Mary Kowalski | 4 | Daughter | — | Michigan |
| 34 | Robert Kowalski | 2 | Son | — | Michigan |
| 35 | Betty Kowalski | 1 | Daughter | — | Michigan |
| 36 | Richard Kowalski | 0 | Son | — | Michigan |
| 37 | Mary Kowalski | 0 | Daughter | — | Michigan |
| 38 | Robert Kowalski | 0 | Son | — | Michigan |
| 39 | Betty Kowalski | 0 | Daughter | — | Michigan |
| 40 | Richard Kowalski | 0 | Son | — | Michigan |
| 41 | Mary Kowalski | 0 | Daughter | — | Michigan |
| 42 | Robert Kowalski | 0 | Son | — | Michigan |
| 43 | Betty Kowalski | 0 | Daughter | — | Michigan |
| 44 | Richard Kowalski | 0 | Son | — | Michigan |
| 45 | Mary Kowalski | 0 | Daughter | — | Michigan |
| 46 | Robert Kowalski | 0 | Son | — | Michigan |
| 47 | Betty Kowalski | 0 | Daughter | — | Michigan |
| 48 | Richard Kowalski | 0 | Son | — | Michigan |
| 49 | Mary Kowalski | 0 | Daughter | — | Michigan |
| 50 | Robert Kowalski | 0 | 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)