JL
John Leary — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this John Leary across the 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 10-person household.
Age 20
b. ~1920
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Leary |
| Given Name | John F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Student |
| Class of Worker | S |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Student |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1920 |
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 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Leary | Other | — | 52 | ~1888 |
| Margaret Leary | Daughter | — | 23 | ~1917 |
| Francis Leary | Son | — | 18 | ~1922 |
| Norbert Leary | Son | — | 17 | ~1923 |
| Daniel Leary | Son | — | 25 | ~1915 |
| Ellen Leary | Daughter | — | 11 | ~1929 |
| William Leary | Son | — | 16 | ~1924 |
| Ann Leary | Daughter | — | 13 | ~1927 |
| John Leary | Head | — | 55 | ~1885 |
| John Leary | Son | — | 20 | ~1920 |
Census Appearances
1930
Allegheny, Pennsylvania
Son, age 10
Allegheny, Pennsylvania · implied b. ~1920 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leary |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Son, age 20
Allegheny-County, Pennsylvania · implied b. ~1920 — 10 household members
| Surname | Leary |
| Given Name | John F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Occupation | Student |
| Class of Worker | S |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| 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 John Leary across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Leary
Son · 1940 · age 20 · b. ~1920 · Pennsylvania
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Sibling
Norbert Leary
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ellen Leary
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Daniel Leary
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ann Leary
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Leary
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Leary
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Leary
Sibling · 1940 · age 18
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-t0627-03662-00055)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Charlotte Harper | 51 | Domestic | Domestic | Virginia |
| 42 | Ella P. Fehr | 71 | Head | Housewife | Pennsylvania |
| 43 | Lillian M. Fehr | 36 | Daughter | Teacher | Pennsylvania |
| 44 | Alice P. Fehr | 34 | Daughter | Teacher | Pennsylvania |
| 45 | Corbly W. Wilcox | 56 | Head | Housewife | Pennsylvania |
| 46 | Sarah Flaherty | 50 | Domestic | Domestic | Pennsylvania |
| 47 | Edgar M. Moore | 76 | Head | Agent | Pennsylvania |
| 48 | Flora W. Moore | 75 | Wife | Housewife | Eire |
| 49 | Mary Kaltenbaugh | 36 | Domestic | Domestic | Pennsylvania |
| 50 | John Ervin Nelson | 60 | Head | Vice President | Scotland |
| 51 | Margaret Deelda Nelson | 60 | Wife | Housewife | Pennsylvania |
| 52 | John Oliver Nelson | 30 | Son | Minister | Pennsylvania |
| 53 | Margaret E. Nelson | 24 | Daughter | Social Work | Pennsylvania |
| 54 | Mary Shevran | 35 | Domestic | Domestic | Pennsylvania |
| 55 | Stella Pochynok | 34 | Domestic | Domestic | Pennsylvania |
| 56 | Erling Erich | 45 | Head | Engineer | Norway |
| 57 | Dorothy Erich | 33 | Wife | Writer | Pennsylvania |
| 58 | Le Roy B. Meanor | 36 | Head | Manager | Pennsylvania |
| 59 | Florence Meanor | 36 | Wife | Housewife | New Jersey |
| 60 | George Meanor | 4 | Son | — | Pennsylvania |
| 61 | Isabel Miller | 25 | Maid | Housewife | Scotland |
| 62 | John Leary | 55 | Head | Plumber | Pennsylvania |
| 63 | Daniel E. Leary | 25 | Son | Machinist | Pennsylvania |
| 64 | Margaret M. Leary | 23 | Daughter | Cashier | Pennsylvania |
| 65 | John F. Leary THIS PERSON | 20 | Son | Student | Pennsylvania |
| 66 | Francis F. Leary | 18 | Son | Student | Pennsylvania |
| 67 | Norbert J. Leary | 17 | Son | Student | Pennsylvania |
| 68 | William E. Leary | 16 | Son | Student | Pennsylvania |
| 69 | Ann Leary | 13 | Daughter | — | Pennsylvania |
| 70 | Ellen A. Leary | 11 | Daughter | — | Pennsylvania |
| 71 | Mary Leary | 52 | Sister | Housekeeper | Pennsylvania |
| 72 | Harry G. O'Brien | 52 | Head | Salesman | Pennsylvania |
| 73 | Marie L. O'Brien | 45 | Wife | Housewife | Pennsylvania |
| 74 | Harry Jr. O'Brien | 22 | Son | Salesman | Pennsylvania |
| 75 | William C. O'Brien | 16 | Son | Student | Pennsylvania |
| 76 | Robert O'Brien | 12 | Son | — | Ohio |
| 77 | George C. Schulte | 65 | Head | Salesman | Michigan |
| 78 | Fannie V. Schulte | 65 | Wife | Housewife | Michigan |
| 79 | Ralph J. Coffey | 46 | Head | Auditor | Illinois |
| 80 | Florence Coffey | 40 | Wife | Housewife | Illinois |
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)