MK
Mary Kowalski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · None, None
Our Model Tree links this Mary Kowalski across the 1920 and 1930 US Censuses (XGBoost, ~Confirmed) — first a daughter (b.~1913), then head of a 8-person household.
Age 17
b. ~1913
Female
Daughter
Born: Wisconsin
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | None, None |
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Est. Birth Year | ~1913 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Amelia Kowalski | Spouse | — | 37 | ~1893 |
| Irene Kowalski | Daughter | — | 2 | ~1928 |
| Genevieve Kowalski | Daughter | — | 11 | ~1919 |
| John Kowalski | Son | — | 14 | ~1916 |
| Julius Kowalski | Head | — | 44 | ~1886 |
| Mary Kowalski | Daughter | — | 17 | ~1913 |
| Julius Kowalski | Son | — | 8 | ~1922 |
| Chester Kowalski | Son | — | 6 | ~1924 |
Census Appearances
1920
None, None
Daughter, age 8
None, None · implied b. ~1912 — 40 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Martha |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1930
None, None
Daughter, age 17
None, None · implied b. ~1913 — 8 household members
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read/Write | Yes |
| 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 Mary Kowalski across 2 US Census years (1920 and 1930) in None, None, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Kowalski
Daughter · 1930 · age 17 · b. ~1913 · None
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Sibling
Genevieve Kowalski
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Kowalski
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Chester Kowalski
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irene Kowalski
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julius 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 — None, None
Open full size
1930 US Federal Census — None, None
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel530:0541)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Tedy | 7 | Son | — | Illinois |
| 2 | Annie | 5 | Daughter | — | Illinois |
| 3 | Mary | 3 | Daughter | — | Illinois |
| 4 | Frank Skora | 43 | Head | — | Poland |
| 5 | Walter Skora | 10 | Son | — | Illinois |
| 6 | Mary Skora | 76 | Mother | — | Poland |
| 7 | Albert Ghmiel | 51 | Head | Labor | Poland |
| 8 | Lowell Ghmiel | 51 | Wife | — | Poland |
| 9 | Mary Ghmiel | 18 | Daughter | Key Puncher | Illinois |
| 10 | Geneva Ghmiel | 17 | Daughter | — | Illinois |
| 11 | John Hattan | 17 | Boarder | Labor | Wisconsin |
| 12 | Julius Kowalski | 44 | Head | Molder | Poland |
| 13 | Amelia Kowalski | 37 | Wife | — | Poland |
| 14 | Mary Kowalski THIS PERSON | 17 | Daughter | — | Wisconsin |
| 15 | John Kowalski | 14 | Son | — | Wisconsin |
| 16 | Genevieve Kowalski | 11 | Daughter | — | Wisconsin |
| 17 | Julius Kowalski | 8 | Son | — | Wisconsin |
| 18 | Chester S. Kowalski | 6 | Son | — | Wisconsin |
| 19 | Irene M. Kowalski | 2 | Daughter | — | Wisconsin |
| 20 | Andrew Breslaw | 58 | Head | Molder | Poland |
| 21 | Anna Breslaw | 57 | Wife | — | Poland |
| 22 | Joseph Breslaw | 25 | Son | Press Operator | Illinois |
| 23 | Walter Rynkiewicz | 36 | Head | Labor | Poland |
| 24 | Frances Rynkiewicz | 27 | Wife | — | Illinois |
| 25 | Walter S. Jr. Rynkiewicz | 6 | Son | — | Illinois |
| 26 | Eleanor H. Rynkiewicz | 3 | Daughter | — | Illinois |
| 27 | Theodore Rynkiewicz | 1 | Daughter | — | Illinois |
| 28 | Lester Bruce | 39 | Head | Molder | Illinois |
| 29 | Katherine Bruce | 36 | Wife | — | Nebraska |
| 30 | Ronald Bruce | 15 | Son | — | Nebraska |
| 31 | Charles Bruce | 12 | Son | — | Nebraska |
| 32 | Bertha Bruce | 10 | Daughter | — | Illinois |
| 33 | Bonnie Bruce | 4 | Daughter | — | Illinois |
| 34 | Sever Sajvickas | 40 | Head | Truck Driver | Lithuania |
| 35 | Tillie Sajvickas | 27 | Wife | — | Lithuania |
| 36 | Joseph Sajvickas | 1 | Son | — | Illinois |
| 37 | Annie Haas | 47 | Head | — | Poland |
| 38 | Violet Haas | 20 | Daughter | Machine Op. | Illinois |
| 39 | Stanley Haas | 19 | Son | Labor | Illinois |
| 40 | Joseph Haas | 17 | Son | Mail Boy | Illinois |
| 41 | Sylvester Haas | 14 | Son | — | Illinois |
| 42 | Eugene Haas | 11 | Son | — | Illinois |
| 43 | John Skimphire | 57 | Head | — | Poland |
| 44 | Frances Skimphire | 54 | Wife | — | Poland |
| 45 | Walter Skimphire | 26 | Son | Machinist | Illinois |
| 46 | Alex Skimphire | 24 | Son | Foreman | Illinois |
| 47 | Sylvester Skimphire | 21 | Son | Labor | Illinois |
| 48 | Agnes Skimphire | 19 | Daughter | Packer | Illinois |
| 49 | Harriet Skimphire | 17 | Daughter | Packer | Illinois |
| 50 | John Skimphire | 15 | 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)