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William Brennan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this William Brennan across the 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a son (b.~1912), then head of a 11-person household.
Age 18
b. ~1912
Male
Son
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Brennan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Indiana |
| Additional Details | |
| Occupation | Steamfitter App |
| Industry | Building Construction |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Steamfitter App |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1912 |
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.
11 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| John Brennan | Head | — | 43 | ~1887 |
| Winifred Brennan | Daughter | — | 16 | ~1914 |
| Joseph Brennan | Son | — | 2 | ~1928 |
| Maurice Brennan | Daughter | — | 14 | ~1916 |
| Elizabeth Brennan | Spouse | — | 41 | ~1889 |
| Anne Brennan | Daughter | — | 5 | ~1925 |
| Rodger Brennan | Son | — | 11 | ~1919 |
| John Brennan | Son | — | 7 | ~1923 |
| Elizabeth Brennan | Daughter | — | 15 | ~1915 |
| William Brennan | Son | — | 18 | ~1912 |
| Alice Brennan | Daughter | — | 4 | ~1926 |
Census Appearances
1930
Cook, Illinois
Son, age 18
Cook, Illinois · implied b. ~1912 — 11 household members
| Surname | Brennan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Indiana |
| Occupation | Steamfitter App |
| Industry | Building Construction |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 28
Cook-County, Illinois · implied b. ~1912 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Breneman |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Shipping Clerk |
| Industry | Wholesale Food Mfg |
| Class of Worker | PW |
| Hours Worked | 43 |
| Income (1939) | 1800 |
| Highest Grade | No 8 |
| 1935 Residence | Illinois |
| 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 Brennan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Brennan
Son · 1930 · age 18 · b. ~1912 · Illinois
★ You are viewing this record
Sibling
John Brennan
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Brennan
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Brennan
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Brennan
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Maurice Brennan
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rodger Brennan
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anne Brennan
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Winifred Brennan
Sibling · 1930 · age 16
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:illinoiscensus00reel442:0648)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | John Brennan | 43 | Head | Blacksmith | Irish Free State |
| 52 | Elizabeth Brennan | 41 | Wife | None | Irish Free State |
| 53 | William Brennan THIS PERSON | 18 | Son | Steamfitter App | Illinois |
| 54 | Winifred Brennan | 16 | Daughter | Operator | Illinois |
| 55 | Elizabeth Brennan | 15 | Daughter | None | Illinois |
| 56 | Maurice Brennan | 14 | Daughter | None | Illinois |
| 57 | Rodger Brennan | 11 | Son | None | Illinois |
| 58 | John Brennan | 7 | Son | None | Illinois |
| 59 | Anne Brennan | 5 | Daughter | None | Illinois |
| 60 | Alice Brennan | 4 | Daughter | None | Illinois |
| 61 | Joseph Brennan | 2 | Son | None | Illinois |
| 62 | Constantine Appel | 40 | Head | Butcher | Serbia |
| 63 | Marie Appel | 37 | Wife | None | Yugoslavia |
| 64 | Mary Appel | 19 | Daughter | None | Ohio |
| 65 | Barbara Appel | 18 | Daughter | Stenographer | Ohio |
| 66 | Paul Liebezeit | 32 | Head | Musician | Dresden Ger |
| 67 | Minna Liebezeit | 18 | Wife | None | Germany |
| 68 | Gunther Liebezeit | 0 | Son | None | Germany |
| 69 | Julia Albrecht | 54 | Head | None | Switzerland |
| 70 | John Albrecht | 35 | Son | Sheet Metal | Illinois |
| 71 | William Albrecht | 33 | Son | Laborer | Illinois |
| 72 | Richard Moon | 41 | Head | Laborer | Illinois |
| 73 | Margaret Moon | 42 | Wife | None | Illinois |
| 74 | Richard Moon | 20 | Son | — | Minnesota |
| 75 | George Moon | 38 | Brother | Salesman | Illinois |
| 76 | George Jr Moon | 10 | Nephew | None | Illinois |
| 77 | Dorothy Moon | 13 | Niece | None | Illinois |
| 78 | Marion Moon | 7 | Nephew | None | Illinois |
| 79 | Theodore Shellzok | 77 | Head | None | Germany |
| 80 | Joseph Shellzok | 48 | Son | Laborer | Illinois |
| 81 | William Shellzok | 40 | Son | None | Illinois |
| 82 | Patrick O'Cleary | 51 | Head | Laborer | Irish Free State |
| 83 | Kate O'Cleary | 50 | Wife | None | Irish Free State |
| 84 | Anna O'Cleary | 24 | Daughter | None | Illinois |
| 85 | Patrick O'Cleary | 19 | Son | Time Keeper | Illinois |
| 86 | John O'Cleary | 17 | Son | Messenger | Illinois |
| 87 | Richard O'Cleary | 17 | Son | None | Illinois |
| 88 | Maurice O'Cleary | 14 | Son | None | Illinois |
| 89 | Albert Kuelba | 44 | Head | Motorman | Illinois |
| 90 | Mary Kuelba | 43 | Wife | None | Illinois |
| 91 | Albert Jr Kuelba | 18 | Son | Messenger | Illinois |
| 92 | Elizabeth Ernest | 61 | Head | None | Illinois |
| 93 | Conrad Ernest | 25 | Son | Machinist | Illinois |
| 94 | Elizabeth Ernest | 27 | Daughter | Bookkeeper | Illinois |
| 95 | William Ernest | 28 | Son | Salesman | Illinois |
| 96 | Max Horing | 76 | Head | None | Germany |
| 97 | Albert Horing | 41 | Son | Baker | Illinois |
| 98 | Richard Horing | 39 | Son | Truck Driver | Illinois |
| 99 | Walter Horing | 35 | Son | Line Man | Illinois |
| 100 | Fred Horing | 31 | Son | Truck Driver | 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)