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John Brennan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this John Brennan across the 1920 and 1930 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a head (b.~1884), then head of a 12-person household.
Age 46
b. ~1884
Male
Head
Born: Ireland
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1909 |
| Age at First Marriage | 25 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Laborer |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 7000 |
| Radio Set | R |
| Veteran | No |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Laborer |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1884 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Mary Brennan | Daughter | — | 17 | ~1913 |
| Norine Brennan | Daughter | — | 7 | ~1923 |
| Catherine Brennan | Daughter | — | 14 | ~1916 |
| Anna Brennan | Daughter | — | 4 | ~1926 |
| John Brennan | Head | — | 46 | ~1884 |
| Thomas Brennan | Son | — | 12 | ~1918 |
| John Brennan | Son | — | 18 | ~1912 |
| Francis Brennan | Son | — | 9 | ~1921 |
| Michael Brennan | Son | — | 10 | ~1920 |
| James Brennan | Son | — | 3 | ~1927 |
| Martin Brennan | Son | — | 15 | ~1915 |
| Catherine Brennan | Spouse | — | 40 | ~1890 |
Census Appearances
1920
Cook, Illinois
Son, age 35
Cook, Illinois · implied b. ~1885 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Ireland |
| Year of Immigration | 1889 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Laborer |
| Industry | Stock Yds |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Cook, Illinois
Head, age 46
Cook, Illinois · implied b. ~1884 — 12 household members
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1909 |
| Age at First Marriage | 25 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Laborer |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 7000 |
| Radio Set | R |
| Veteran | No |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 John Brennan across 2 US Census years (1920 and 1930) in Cook, Illinois, using XGBoost record linkage.
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This person
Anchor record
John Brennan
Head · 1930 · age 46 · b. ~1884 · Illinois
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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:illinoiscensus00reel437:0758)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Donohue | None | — | — | — |
| 52 | Mary Costello | 49 | Head | Housewife | Illinois |
| 53 | Joseph Costello | 30 | — | Switchman | Illinois |
| 54 | Thomas Costello | 25 | Son | Laborer | Illinois |
| 55 | Dora Costello | 19 | Daughter | None | Illinois |
| 56 | Mary Costello | 20 | Daughter | None | Illinois |
| 57 | Mary Byrnes | 27 | Sister | None | Illinois |
| 58 | Bryan Kennedy | 38 | Head | Laborer | Ireland |
| 59 | Bridget Kennedy | 37 | Wife | Housewife | Ireland |
| 60 | Josephine Kennedy | 10 | Daughter | None | Illinois |
| 61 | Mary Kennedy | 8 | Daughter | None | Illinois |
| 62 | Patrick Kennedy | 7 | Son | None | Illinois |
| 63 | Theresa Kennedy | 6 | Daughter | None | Illinois |
| 64 | Margaret Kennedy | 4 | Daughter | None | Illinois |
| 65 | Julia E. Kennedy | 2 | Daughter | None | Illinois |
| 66 | Bridget J. Kennedy | 1 | Daughter | None | Illinois |
| 67 | Michael Coyle | 46 | Head | Laborer | Ireland |
| 68 | Mary Coyle | 45 | Wife | Laborer | Ireland |
| 69 | John Brennan THIS PERSON | 46 | Head | Laborer | Ireland |
| 70 | Catherine Brennan | 40 | Wife | Housewife | Ireland |
| 71 | John J. Brennan | 18 | Son | Messenger Boy | Illinois |
| 72 | Mary Brennan | 17 | Daughter | Operator | Illinois |
| 73 | Martin Brennan | 15 | Son | Messenger Boy | Illinois |
| 74 | Catherine Brennan | 14 | Daughter | None | Illinois |
| 75 | Thomas Brennan | 12 | Son | None | Illinois |
| 76 | Michael Brennan | 10 | Son | None | Illinois |
| 77 | Francis Brennan | 9 | Son | None | Illinois |
| 78 | Norine Brennan | 7 | Daughter | None | Illinois |
| 79 | Anna M. Brennan | 4 | Daughter | None | Illinois |
| 80 | James Brennan | 3 | Son | None | Illinois |
| 81 | Richard Stirk | 32 | Head | Laborer | Illinois |
| 82 | Lillian Stirk | 30 | Wife | Housewife | Illinois |
| 83 | Russell Stirk | 14 | Son | None | Illinois |
| 84 | Earl Stirk | 10 | Son | None | Illinois |
| 85 | Evelyn Stirk | 8 | Daughter | None | Illinois |
| 86 | Nadine Stirk | 6 | Daughter | None | Illinois |
| 87 | — | None | — | — | — |
| 88 | — | None | — | — | — |
| 89 | James Young | 60 | Head | None | Illinois |
| 90 | Rosaline Young | 54 | Wife | None | Illinois |
| 91 | John Dalkin | 49 | Head | None | Illinois |
| 92 | Alma Dalkin | 46 | Wife | None | Illinois |
| 93 | Jessie Ross | 81 | Mother | House Keeper | Scotland |
| 94 | Arthur Ross | 42 | Son | Mechanic | Illinois |
| 95 | Margaret Ross | 40 | Daughter | Saleswoman | Illinois |
| 96 | Herbert J. Payson | 41 | Head | Salesman | Illinois |
| 97 | Maude Payson | 33 | Wife | Housewife | Illinois |
| 98 | Janet Payson | 11 | Daughter | None | Illinois |
| 99 | Roger Payson | 10 | Son | None | Illinois |
| 100 | John Simpson | 58 | Head | Engineer | Scotland |
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)