WM
William Mccormick — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this William Mccormick across the 1920 and 1930 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a son (b.~1911), then head of a 12-person household.
Age 19
b. ~1911
Male
Son
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | McCormick |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Occupation | Sheet metal work |
| Industry | Metal Contractor |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Sheet Metal Work |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1911 |
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.
12 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Margaret Mccormick | Daughter | — | 10 | ~1920 |
| Agnes Mccormick | Spouse | — | 42 | ~1888 |
| Coletta Mccormick | Daughter | — | 2 | ~1928 |
| Florence Mccormick | Daughter | — | 15 | ~1915 |
| Marion Mccormick | Daughter | — | 12 | ~1918 |
| Laverne Mccormick | Daughter | — | 4 | ~1926 |
| Rosemary Mccormick | Daughter | — | 8 | ~1922 |
| Gilbert Mccormick | Son | — | 17 | ~1913 |
| Michael Mccormick | Head | — | 43 | ~1887 |
| William Mccormick | Son | — | 19 | ~1911 |
| Helen Mccormick | Daughter | — | ~1930 | |
| Agnes Mccormick | Daughter | — | 21 | ~1909 |
Census Appearances
1920
Cook, Illinois
Son, age 9
Cook, Illinois · implied b. ~1911 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mc Cormack |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 19
Cook, Illinois · implied b. ~1911 — 12 household members
| Surname | McCormick |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Sheet metal work |
| Industry | Metal Contractor |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 William Mccormick across 2 US Census years (1920 and 1930) in Cook, Illinois, using XGBoost record linkage.
Show:
This person
Anchor record
William Mccormick
Son · 1930 · age 19 · b. ~1911 · Illinois
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Sibling
Laverne Mccormick
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Coletta Mccormick
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mccormick
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gilbert Mccormick
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Mccormick
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Agnes Mccormick
Sibling · 1930 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rosemary Mccormick
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marion Mccormick
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Mccormick
Sibling · 1930 · age
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:illinoiscensus00reel434:0348)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Rose Siegert | 46 | Wife | Stenographer | Illinois |
| 52 | Martin Skiba | 44 | Head | Painter | Poland |
| 53 | Marie Skiba | 40 | Wife | — | Poland |
| 54 | Casimir Skiba | 15 | Son | — | Illinois |
| 55 | Josephine Skiba | 12 | Daughter | — | Illinois |
| 56 | Raymond Skiba | 9 | Son | — | Illinois |
| 57 | Michael Nowacki | 43 | Head | Trucking Man | Poland |
| 58 | Mary Nowacki | 50 | Wife | — | Illinois |
| 59 | Lawrence Nowacki | 23 | Step-son | Laborer | Illinois |
| 60 | John Nowacki | 15 | Son | — | Illinois |
| 61 | Andrew Nowacki | 11 | Son | — | Illinois |
| 62 | Anthony Nowacki | 24 | Lodger | Cutter | Poland |
| 63 | Alice Gurning | 75 | Head | — | Free State |
| 64 | Michael Gurning | 45 | Son | Truck Driver | Illinois |
| 65 | Josephine Walsh | 43 | Daughter | Signatress | Illinois |
| 66 | Michael Mccormick | 43 | Head | Sheet Metal Work | Illinois |
| 67 | Agnes Mccormick | 42 | Wife | — | Illinois |
| 68 | Agnes Mccormick | 21 | Daughter | Secretary | Illinois |
| 69 | William Mccormick THIS PERSON | 19 | Son | Sheet Metal Work | Illinois |
| 70 | Gilbert Mccormick | 17 | Son | Phone Boy | Illinois |
| 71 | Florence Mccormick | 15 | Daughter | — | Illinois |
| 72 | Marion Mccormick | 12 | Daughter | — | Illinois |
| 73 | Margaret Mccormick | 10 | Daughter | — | Illinois |
| 74 | Rosemary Mccormick | 8 | Daughter | — | Illinois |
| 75 | Laverne Mccormick | 4 | Daughter | — | Illinois |
| 76 | Coletta Mccormick | 2 | Daughter | — | Illinois |
| 77 | Helen Mccormick | 0 | Daughter | — | Illinois |
| 78 | Felix Luzauskas | 34 | Head | Truck Driver | Lithuania |
| 79 | Emily Luzauskas | 35 | Wife | — | Lithuania |
| 80 | George Luzauskas | 14 | Son | — | Lithuania |
| 81 | Mary Urban | 65 | Lodger | — | Lithuania |
| 82 | Anthony Mullaney | 57 | Head | Plasterer | Irish Free State |
| 83 | Mary Mullaney | 53 | Wife | — | Ireland |
| 84 | John Mullaney | 30 | Son | Musician | Illinois |
| 85 | Frank Lukasiewicz | 49 | Head | Erector | Poland |
| 86 | Josephine Lukasiewicz | 45 | Wife | — | Poland |
| 87 | Bruno Lukasiewicz | 28 | Son | Bonus Clerk | Illinois |
| 88 | Celia Lukasiewicz | 25 | Daughter | Manager | Illinois |
| 89 | Eleanor Lukasiewicz | 22 | Daughter | Mach. Operator | Illinois |
| 90 | Stanley Lukasiewicz | 20 | Son | Stock Man | Illinois |
| 91 | Louis Lukasiewicz | 15 | Son | — | Illinois |
| 92 | Walter Dombrowski | 31 | Head | Laborer | Illinois |
| 93 | Dorothy Dombrowski | 24 | Wife | — | Poland |
| 94 | Lorraine Dombrowski | 5 | Daughter | — | Illinois |
| 95 | James Dombrowski | 3 | Son | — | Illinois |
| 96 | John Koniezny | 35 | Head | Stone Cutter | Poland |
| 97 | Mary Koniezny | 29 | Wife | — | Poland |
| 98 | Marion Koniezny | 6 | Daughter | — | Illinois |
| 99 | Jennie Koniezny | 4 | Daughter | — | Illinois |
| 100 | Lottie Koniezny | 2 | Daughter | — | Illinois |
Related Census Records
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)