FK
Frank Kowalski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Frank Kowalski across the 1920 and 1930 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a son (b.~1918), then head of a 20-person household.
Age 12
b. ~1918
Male
Son
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Additional Details | |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1918 |
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.
20 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Frank | Age | Birth yr |
|---|---|---|---|---|
| Frank Kowalski | Son | — | 12 | ~1918 |
| Mary Kowalski | Spouse | — | 36 | ~1894 |
| Sophie Kowalski | Daughter | — | 14 | ~1916 |
| Sophie Kowalski | Daughter | — | 11 | ~1919 |
| Frances Kowalski | Daughter | — | 8 | ~1922 |
| Edward Kowalski | Son | — | 13 | ~1917 |
| Helen Kowalski | Spouse | — | 31 | ~1899 |
| Frank Kowalski | Son | — | 35 | ~1895 |
| Edward Kowalski | Son | — | 14 | ~1916 |
| Catherine Kowalski | Daughter | — | 4 | ~1926 |
| Bernice Kowalski | Daughter | — | 8 | ~1922 |
| Leo Kowalski | Son | — | 2 | ~1928 |
| Martha Kowalski | Daughter | — | 11 | ~1919 |
| Stanley Kowalski | Son | — | 1 | ~1929 |
| Lucille Kowalski | Daughter | — | ~1930 | |
| Helen Kowalski | Daughter | — | 17 | ~1913 |
| Frank Kowalski | Head | — | 41 | ~1889 |
| Joseph Kowalski | Son | — | 10 | ~1920 |
| Wanda Kowalski | Daughter | — | 6 | ~1924 |
| Josephine Kowalski | Daughter | — | 12 | ~1918 |
Census Appearances
1920
Cook, Illinois
Son, age 1
Cook, Illinois · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Mother Tongue | Polish |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 12
Cook, Illinois · implied b. ~1918 — 20 household members
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Frank Kowalski across 2 US Census years (1920 and 1930) in Cook, Illinois, using XGBoost record linkage.
Show:
This person
Anchor record
Frank Kowalski
Son · 1930 · age 12 · b. ~1918 · Illinois
★ You are viewing this record
Sibling
Sophie Kowalski
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Kowalski
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martha Kowalski
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Kowalski
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lucille Kowalski
Sibling · 1930 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernice Kowalski
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Kowalski
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Kowalski
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Wanda Kowalski
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley Kowalski
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sophie Kowalski
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Kowalski
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Kowalski
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Kowalski
Sibling · 1930 · age 35
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Kowalski
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Kowalski
Sibling · 1930 · age 8
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 — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel437:0245)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | John Malone | 47 | Head | — | Ireland |
| 52 | Catherine Malone | 47 | Wife | — | Ireland |
| 53 | John J. Malone | 17 | Son | Carpenter | Illinois |
| 54 | Thomas Malone | 16 | Son | Laborer | Illinois |
| 55 | James Malone | 14 | Son | — | Illinois |
| 56 | Mary Malone | 12 | Daughter | — | Illinois |
| 57 | Francis Malone | 10 | Son | — | Illinois |
| 58 | Catherine Malone | 8 | Daughter | — | Illinois |
| 59 | Edward Malone | 6 | Son | — | Illinois |
| 60 | William Malone | 4 | Son | — | Illinois |
| 61 | Alice Malone | 1 | Daughter | — | Illinois |
| 62 | Rita Malone | 0 | Daughter | — | Illinois |
| 63 | John Grotowski | 72 | Head | — | Poland |
| 64 | Andrew Grotowski | 45 | Son | Laborer | Poland |
| 65 | Edward Grotowski | 35 | Son | Laborer | Illinois |
| 66 | Bernice Grotowski | 34 | Daughter | — | Illinois |
| 67 | Helen Grotowski | 27 | Daughter | — | Illinois |
| 68 | Leo Grotowski | 25 | Son | Laborer | Illinois |
| 69 | Joseph Grotowski | 23 | Son | Laborer | Illinois |
| 70 | Mary Grotowski | 21 | Daughter | — | Illinois |
| 71 | Stanley Grotowski | 18 | Son | Laborer | Illinois |
| 72 | Alice Grotowski | 16 | Daughter | — | Illinois |
| 73 | John Grotowski | 14 | Son | — | Illinois |
| 74 | Frank Grotowski | 12 | Son | — | Illinois |
| 75 | Josephine Grotowski | 10 | Daughter | — | Illinois |
| 76 | Martha Grotowski | 8 | Daughter | — | Illinois |
| 77 | Clara Grotowski | 6 | Daughter | — | Illinois |
| 78 | Theresa Grotowski | 4 | Daughter | — | Illinois |
| 79 | Gertrude Grotowski | 2 | Daughter | — | Illinois |
| 80 | Dorothy Grotowski | 0 | Daughter | — | Illinois |
| 81 | Frank Kowalski | 41 | Head | Laborer | Poland |
| 82 | Mary Kowalski | 36 | Wife | — | Poland |
| 83 | Edward Kowalski | 13 | Son | — | Illinois |
| 84 | Josephine Kowalski | 12 | Daughter | — | Illinois |
| 85 | Sophie Kowalski | 11 | Daughter | — | Illinois |
| 86 | Frances Kowalski | 8 | Daughter | — | Illinois |
| 87 | Frank Kowalski | 35 | Son | Laborer | Poland |
| 88 | Helen Kowalski | 31 | Wife | — | Poland |
| 89 | Sophie Kowalski | 14 | Daughter | — | Illinois |
| 90 | Martha Kowalski | 11 | Daughter | — | Illinois |
| 91 | Bernice Kowalski | 8 | Daughter | — | Illinois |
| 92 | Wanda Kowalski | 6 | Daughter | — | Illinois |
| 93 | Catherine Kowalski | 4 | Daughter | — | Illinois |
| 94 | Leo Kowalski | 2 | Son | — | Illinois |
| 95 | Stanley Kowalski | 1 | Son | — | Illinois |
| 96 | Lucille Kowalski | 0 | Daughter | — | Illinois |
| 97 | Helen Kowalski | 17 | Daughter | — | Illinois |
| 98 | Edward Kowalski | 14 | Son | — | Illinois |
| 99 | Frank Kowalski THIS PERSON | 12 | Son | — | Illinois |
| 100 | Joseph Kowalski | 10 | Son | — | Illinois |
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)