JK
John Kowalski — 1930 US Census Record
Model Tree available1930 United States Federal Census · Milwaukee, Wisconsin
Our Model Tree links this John Kowalski across the 1920, 1930 and 1940 US Censuses in Milwaukee, Wisconsin (XGBoost, ~Confirmed), with identified parents Frank & Anna — first a head (b.~1893), then head of a 8-person household.
Age 37
b. ~1893
Male
Head
Born: Wisconsin
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Milwaukee, Wisconsin |
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| Age at First Marriage | 27 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Additional Details | |
| Occupation | Machinist |
| Industry | Tractor Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 7200 |
| Radio Set | R |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Occupation | Machinist |
| Township / Ward | Milwaukee City |
| Est. Birth Year | ~1893 |
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.
8 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Arnold Kowalski | Son | — | 9 | ~1921 |
| Evelyn Kowalski | Daughter | — | 8 | ~1922 |
| Blanche Kowalski | Other | — | 33 | ~1897 |
| Eleanore Kowalski | Daughter | — | 6 | ~1924 |
| Florence Kowalski | Daughter | — | 15 | ~1915 |
| John Kowalski | Head | — | 37 | ~1893 |
| Dorothy Kowalski | Daughter | — | 5 | ~1925 |
| Henry Kowalski | Son | — | 17 | ~1913 |
Census Appearances
1920
Milwaukee, Wisconsin
Son, age 26
Milwaukee, Wisconsin · implied b. ~1894 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1930
Milwaukee, Wisconsin
Head, age 37
Milwaukee, Wisconsin · implied b. ~1893 — 8 household members
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| Age at First Marriage | 27 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Machinist |
| Industry | Tractor Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 7200 |
| Radio Set | R |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1940
Milwaukee-County, Wisconsin
Head, age 48
Milwaukee-County, Wisconsin · implied b. ~1892 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalsky |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Milwaukee |
| 1935 Residence (County) | Milwaukee |
| Occupation | Machinist |
| Industry | Farm Implements |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1500 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Kowalski (~0.92 confidence) and mother Anna Kowalski (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Kowalski
b. ~1867
Source father
● Household
· direct · ~0.92
Mother
Anna Kowalski
b. ~1868
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Kowalski
Head · 1930 · age 37 · b. ~1893 · Wisconsin
★ 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 — Milwaukee, Wisconsin
Open full size
1930 US Federal Census — Milwaukee, Wisconsin
Page Contents
50 people indexed on this census page (ia:1930:15thcensus2590unit:0535)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Daniel Pulos | 9 | son | None | Wisconsin |
| 52 | Celia Pulos | 18 | daughter | None | Wisconsin |
| 53 | Joseph Latzak | 33 | Head | Maid | Illinois |
| 54 | Jenny Latzak | 30 | Wife-H | Vice President | Wisconsin |
| 55 | Caroline Latzak | 8 | daughter | None | Wisconsin |
| 56 | Eugenia Latzak | 5 | daughter | None | Wisconsin |
| 57 | Joseph Jr. Latzak | 2 | son | None | Wisconsin |
| 58 | Raymond Latus | 24 | Head | None | Wisconsin |
| 59 | Alice Latus | 21 | Wife-H | Blue Print | Wisconsin |
| 60 | John Kowalski THIS PERSON | 37 | Head | Machinist | Wisconsin |
| 61 | Blanche Kowalski | 33 | Wife-H | None | Wisconsin |
| 62 | Henry Kowalski | 17 | son | Salesman | Wisconsin |
| 63 | Florence Kowalski | 15 | daughter | None | Wisconsin |
| 64 | Arnold Kowalski | 9 | son | None | Wisconsin |
| 65 | Evelyn Kowalski | 8 | daughter | None | Wisconsin |
| 66 | Eleanore Kowalski | 6 | daughter | None | Wisconsin |
| 67 | Dorothy Kowalski | 5 | daughter | None | Wisconsin |
| 68 | Joseph Pantasiewicz | 46 | Head | Moulder | Poland |
| 69 | Rose Pantasiewicz | 44 | Wife-H | None | Poland |
| 70 | Joseph Jr. Pantasiewicz | 20 | son | Office Boy | Wisconsin |
| 71 | Leo Pantasiewicz | 18 | son | Laborer | Wisconsin |
| 72 | Celia Pantasiewicz | 15 | daughter | None | Wisconsin |
| 73 | Edward Pantasiewicz | 6 | son | None | Wisconsin |
| 74 | Ignatz Kubiak | 50 | Head | Laborer | Poland |
| 75 | Antoinette Kubiak | 46 | Wife-H | None | Poland |
| 76 | William Kubiak | 24 | son | Proprietor | Wisconsin |
| 77 | Hattie Kubiak | 21 | daughter | Cutter | Wisconsin |
| 78 | Walter Kubiak | 18 | son | Grocer | Wisconsin |
| 79 | Sophie Kubiak | 16 | daughter | None | Wisconsin |
| 80 | Esther Kubiak | 12 | daughter | None | Wisconsin |
| 81 | Casimer Kubiak | 10 | son | None | Wisconsin |
| 82 | Ervin Kubiak | 8 | son | None | Wisconsin |
| 83 | Evelyn Kubiak | 6 | daughter | None | Wisconsin |
| 84 | Leo Kojchule | 69 | Head | None | Poland |
| 85 | Sophie Kojchule | 73 | Wife-H | None | Poland |
| 86 | Adam Kaleski | 44 | son | Clerk | Wisconsin |
| 87 | Ignatz Mierzewski | 39 | Head | Moulder | Poland |
| 88 | Catherine Mierzewski | 35 | Wife-H | None | Poland |
| 89 | Alois Mierzewski | 12 | son | None | Wisconsin |
| 90 | Stanley Mierzewski | 8 | son | None | Wisconsin |
| 91 | Leo Mierzewski | 3 | son | None | Wisconsin |
| 92 | Arnold Ebert | 36 | Head | Electrician | Wisconsin |
| 93 | Helen Ebert | 29 | Wife-H | None | Wisconsin |
| 94 | John Ebert | 6 | son | None | Wisconsin |
| 95 | Betty Ebert | 2 | daughter | None | Wisconsin |
| 96 | Casimer Ploczay | 67 | Head | Core Maker | Poland |
| 97 | Victoria Ploczay | 53 | Wife-H | None | Poland |
| 98 | Laura Ploczay | 27 | daughter | Machine Operator | Wisconsin |
| 99 | Max Ploczay | 25 | son | Cutter | Wisconsin |
| 100 | Walter Ploczay | 21 | son | Assembler | Wisconsin |
Pedigree Summary
John
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)