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 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a son (b.~1909), then head of a 10-person household.
Age 21
b. ~1909
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 | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Irish Free State |
| Additional Details | |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1909 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Margaret Mccormick | Daughter | — | 24 | ~1906 |
| David Mccormick | Son | — | 14 | ~1916 |
| Timothy Mccormick | Head | — | 57 | ~1873 |
| Patricia Mccormick | Daughter | — | 12 | ~1918 |
| Timothy Mccormick | Son | — | 19 | ~1911 |
| Lawrence Mccormick | Son | — | 17 | ~1913 |
| Bridget Mccormick | Other | — | 54 | ~1876 |
| James Mccormick | Son | — | 32 | ~1898 |
| Julia Hooley | Daughter | — | 27 | ~1903 |
| William Mccormick | Son | — | 21 | ~1909 |
Census Appearances
1930
Cook, Illinois
Son, age 21
Cook, Illinois · implied b. ~1909 — 10 household members
| Surname | MCCORMICK |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 31
Cook-County, Illinois · implied b. ~1909 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormack |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Bookkeeper |
| Industry | Plumbing Shop |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1534 |
| Highest Grade | H 2 |
| 1935 Residence | Same Place |
| 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 (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Mccormick
Son · 1930 · age 21 · b. ~1909 · Illinois
★ You are viewing this record
Sibling
Patricia Mccormick
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julia Hooley
Sibling · 1930 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mccormick
Sibling · 1930 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mccormick
Sibling · 1930 · age 32
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Timothy Mccormick
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Mccormick
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Mccormick
Sibling · 1930 · age 17
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:illinoiscensus00reel444:0853)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Michael Carmody | 53 | Brother-in-law | Car Repairer | Illinois |
| 2 | Henry Bauch | 60 | Head | Watchman | Illinois |
| 3 | Ada Bauch | 56 | Wife-H | — | Illinois |
| 4 | Theodore Eck Feldt | 31 | Boarder | Chauffeur | Illinois |
| 5 | Frederick Bauch | 40 | Son | Butcher | Illinois |
| 6 | Lillian Bauch | 35 | Daughter-in-law | Manager | Wisconsin |
| 7 | Bertha Geiger | 67 | Head-H | — | Illinois |
| 8 | Jack Barcroft | 37 | Son-in-law | Carpenter | Illinois |
| 9 | Lorraine Barcroft | 23 | Daughter | Secretary | Illinois |
| 10 | William Maher | 39 | Head | Superintendent | Illinois |
| 11 | Margaret Maher | 40 | Wife-H | — | Illinois |
| 12 | Thomas Garner | 28 | Son-in-law | Accounting | England |
| 13 | Anna Garner | 28 | Daughter | Stenographer | Illinois |
| 14 | William Garner | 5 | Grandson | — | Illinois |
| 15 | Timothy Mccormick | 57 | Head | Motorman | Irish Free State |
| 16 | Bridget Mccormick | 54 | Wife-H | — | Irish Free State |
| 17 | James Mccormick | 32 | Son | Chauffeur | Illinois |
| 18 | William Mccormick THIS PERSON | 21 | Son | — | Illinois |
| 19 | Julia Hooley | 27 | Daughter | — | Illinois |
| 20 | Margaret Mccormick | 24 | Daughter | Typist | Illinois |
| 21 | Timothy Mccormick | 19 | Son | — | Illinois |
| 22 | Lawrence Mccormick | 17 | Son | — | Illinois |
| 23 | David Mccormick | 14 | Son | — | Illinois |
| 24 | Patricia Mccormick | 12 | Daughter | — | Illinois |
| 25 | Nellie Corbett | 48 | Head-H | — | Irish Free State |
| 26 | Marie Myers | 27 | Daughter | Binder | Illinois |
| 27 | Helen Corbett | 23 | Daughter | — | Illinois |
| 28 | Rose Corbett | 21 | Daughter | Operator | Illinois |
| 29 | Peter Bolsen | 40 | Head | Laborer | Denmark |
| 30 | Catherine Bolsen | 37 | Wife-H | — | Illinois |
| 31 | Edward O'Neil | 43 | Head | Machinist | Illinois |
| 32 | Loretta O'Neil | 39 | Wife-H | — | Illinois |
| 33 | Eileen O'Neil | 14 | Daughter | — | Illinois |
| 34 | Loretta O'Neil | 11 | Daughter | — | Illinois |
| 35 | Edward O'Neil | 9 | Son | — | Illinois |
| 36 | John O'Neil | 1 | Son | — | Illinois |
| 37 | Charles Schwertfeger | 37 | Head | Officer | Illinois |
| 38 | Anna Schwertfeger | 32 | Wife-H | — | Illinois |
| 39 | James Schwertfeger | 10 | Son | — | Illinois |
| 40 | Charles Schwertfeger | 8 | Son | — | Illinois |
| 41 | Charles Moody | 65 | Father-in-law | — | Irish Free State |
| 42 | Thomas Moody | 25 | Brother-in-law | Salesman | Illinois |
| 43 | Daniel Halsted | 58 | Head | — | England |
| 44 | Annie Halsted | 54 | Wife-H | — | England |
| 45 | William Halsted | 28 | Son | Miller | Kansas |
| 46 | Daniel Halsted | 26 | Son | Attendant | Kansas |
| 47 | Ira Halsted | 21 | Daughter | Foreman | Kansas |
| 48 | Loretta Halsted | 18 | Daughter | Bookkeeper | Kansas |
| 49 | Florence Halsted | 12 | Daughter | — | Kansas |
| 50 | Helen Halsted | 7 | 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)