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Margaret Brennan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Margaret Brennan across the 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 13-person household.
Age 19
b. ~1921
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Brennan |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | New worker |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | New Worker |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1921 |
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.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Patricia Brennan | Daughter | — | 11 | ~1929 |
| Geraldine Brennan | Daughter | — | 7 | ~1933 |
| Francis Brennan | Daughter | — | 9 | ~1931 |
| Thomas Brennan | Son | — | 14 | ~1926 |
| Patricia Angle | Other | — | 6 | ~1934 |
| Virginia Brennan | Daughter | — | 16 | ~1924 |
| Margaret Brennan | Daughter | — | 19 | ~1921 |
| James Brennan | Head | — | 56 | ~1884 |
| Elizabeth Brennan | Daughter | — | 13 | ~1927 |
| Dora Brennan | Spouse | — | 47 | ~1893 |
| Mary Brennan | Daughter | — | 27 | ~1913 |
| Anita Brennan | Daughter | — | 24 | ~1916 |
| Rita Brennan | Daughter | — | 20 | ~1920 |
Census Appearances
1930
Allegheny, Pennsylvania
Daughter, age 9
Allegheny, Pennsylvania · implied b. ~1921 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | Margaret |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Scotland |
| Mother's Birthplace | New York |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Daughter, age 19
Allegheny-County, Pennsylvania · implied b. ~1921 — 13 household members
| Surname | Brennan |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Occupation | New worker |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Margaret Brennan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Margaret Brennan
Daughter · 1940 · age 19 · b. ~1921 · Pennsylvania
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Sibling
Thomas Brennan
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Brennan
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Brennan
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Brennan
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Brennan
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Brennan
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Virginia Brennan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anita Brennan
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Geraldine Brennan
Sibling · 1940 · age 7
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
1940 US Federal Census — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03660-00217)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Bertha Then | 50 | Wife | — | Pennsylvania |
| 42 | Bertha Then | 23 | Daughter | Book Keeper | Pennsylvania |
| 43 | Rita Then | 20 | Daughter | Packer | Pennsylvania |
| 44 | John Then | 19 | Son | Clerk-Sales | Pennsylvania |
| 45 | Regis Then | 16 | Son | — | Pennsylvania |
| 46 | Rose Then | 11 | Daughter | — | Pennsylvania |
| 47 | Michael Horay | 73 | Father | — | Germany |
| 48 | Paul Horay | 42 | Head | Credit Manager | Pennsylvania |
| 49 | Lois Horay | 40 | Wife | — | Pennsylvania |
| 50 | May Rinberg | 35 | Sister-in-law | Sales Clerk | Pennsylvania |
| 51 | Helen Rinberg | 37 | Sister-in-law | File Clerk | Pennsylvania |
| 52 | Michael D. Then | 47 | Head | Automobile Mechanic | Pennsylvania |
| 53 | Catella Then | 48 | Wife | — | Pennsylvania |
| 54 | Catella Then | 13 | Daughter | — | Pennsylvania |
| 55 | Michael Then | 11 | Son | — | Pennsylvania |
| 56 | Marie Keller | 37 | Sister-in-law | File Clerk | Pennsylvania |
| 57 | Ends Here | None | BLOCK | — | — |
| 58 | Harry Fuhnstorke | 70 | Head | — | Pennsylvania |
| 59 | Elizabeth Fuhnstorke | 75 | Wife | — | Pennsylvania |
| 60 | Frank Windisch | 27 | Head | Punch Machine Operator | Pennsylvania |
| 61 | Ruth Windisch | 24 | Wife | — | Pennsylvania |
| 62 | Ruth Windisch | 2 | Daughter | — | Pennsylvania |
| 63 | Patricia Windisch | 0 | Daughter | — | Pennsylvania |
| 64 | James Brennan | 56 | Head | Hoisting Engine Operator | Scotland |
| 65 | Dora Brennan | 47 | Wife | — | New York |
| 66 | Mary Brennan | 27 | Daughter | Waitress | Pennsylvania |
| 67 | Anita Brennan | 24 | Daughter | Waitress | Pennsylvania |
| 68 | Rita Brennan | 20 | Daughter | New Worker | Pennsylvania |
| 69 | Margaret Brennan THIS PERSON | 19 | Daughter | New Worker | Pennsylvania |
| 70 | Virginia Brennan | 16 | Daughter | — | Pennsylvania |
| 71 | Thomas Brennan | 14 | Son | — | Pennsylvania |
| 72 | Elizabeth Brennan | 13 | Daughter | — | Pennsylvania |
| 73 | Patricia Brennan | 11 | Daughter | — | Pennsylvania |
| 74 | Francis Brennan | 9 | Daughter | — | Pennsylvania |
| 75 | Geraldine Brennan | 7 | Daughter | — | Pennsylvania |
| 76 | Patricia Angle | 6 | Granddaughter | — | Pennsylvania |
| 77 | Emil Zandier | 42 | Head | Delivery Clerk | Pennsylvania |
| 78 | Margaret Zandier | 40 | Wife | — | Pennsylvania |
| 79 | Raymond Zandier | 15 | Son | — | Pennsylvania |
| 80 | Bernard Zandier | 12 | Son | — | Pennsylvania |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 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)