JC
James Costello — 1940 US Census Record
Model Tree available1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this James Costello across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1915), then head of a 6-person household.
Age 25
b. ~1915
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Laborer |
| Industry | Steel Mill |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 550 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Laborer |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1915 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| John Costello | Head | — | 46 | ~1894 |
| Rose Costello | Spouse | — | 43 | ~1897 |
| Jack Costello | Son | — | 15 | ~1925 |
| Rose Costello | Daughter | — | 17 | ~1923 |
| Helen Costello | Daughter | — | 8 | ~1932 |
| James Costello | Son | — | 25 | ~1915 |
Census Appearances
1920
Allegheny, Pennsylvania
Son, age 4
Allegheny, Pennsylvania · implied b. ~1916 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Son, age 14
Allegheny, Pennsylvania · implied b. ~1916 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| 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 25
Allegheny-County, Pennsylvania · implied b. ~1915 — 6 household members
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Occupation | Laborer |
| Industry | Steel Mill |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 550 |
| Highest Grade | No 8 |
| 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 James Costello across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Costello (~0.92 confidence) and father John Costello (~0.92 confidence) and father John Costello (~0.92 confidence) and mother Rose Costello (~0.92 confidence) and mother Rose Costello (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Costello
b. ~1894
Source father
● Household
· direct · ~0.92
Father
John Costello
b. ~1897
Source father
● Household
· direct · ~0.92
Father
John Costello
b. ~1893
Source father
● Household
· direct · ~0.92
Mother
Rose Costello
b. ~1897
Source mother
● Household
· direct · ~0.92
Mother
Rose Costello
b. ~1897
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Costello
Son · 1940 · age 25 · b. ~1915 · Pennsylvania
★ You are viewing this record
Sibling
Helen Costello
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Costello
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jack Costello
Sibling · 1940 · age 15
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-t0627-03665-00227)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frederick | 16 | Son | — | Pennsylvania |
| 2 | Anna | 15 | Daughter | — | Pennsylvania |
| 3 | Emelio Jr. | 14 | Son | — | Pennsylvania |
| 4 | Eugene | 12 | Son | — | Pennsylvania |
| 5 | John Costello | 46 | Head | Motor Man | Pennsylvania |
| 6 | Rose Costello | 43 | Wife | — | Pennsylvania |
| 7 | James Costello THIS PERSON | 25 | Son | Laborer | Pennsylvania |
| 8 | Rose Mary Costello | 17 | Daughter | Librarian Assistant | Pennsylvania |
| 9 | Jack Costello | 15 | Son | — | Pennsylvania |
| 10 | Helen Costello | 8 | Daughter | — | Pennsylvania |
| 11 | Michael Givon | 46 | Head | Crane Operator | Yugoslavia |
| 12 | Charlotte Givon | 29 | Wife | — | Yugoslavia |
| 13 | Nicholas Givon | 7 | Son | — | Pennsylvania |
| 14 | Anna Givon | 3 | Daughter | — | Pennsylvania |
| 15 | Nicholas Roper | 32 | Head | Laborer | Pennsylvania |
| 16 | Jennie Roper | 35 | Wife | — | Croatia |
| 17 | Paul Roper | 11 | Son | — | Pennsylvania |
| 18 | Elizabeth Roper | 11 | Daughter | — | Pennsylvania |
| 19 | Albert Harrigan | 42 | Head | Janitor | Pennsylvania |
| 20 | Catharine Harrigan | 40 | Wife | — | Pennsylvania |
| 21 | Patricia Harrigan | 16 | Daughter | — | Pennsylvania |
| 22 | John Wells | 61 | Head | Laborer | Pennsylvania |
| 23 | Lois Wells | 39 | Daughter | — | Pennsylvania |
| 24 | Carl Wells | 25 | Son | Laborer | Pennsylvania |
| 25 | Grace Wells | 27 | Daughter | Packer | Pennsylvania |
| 26 | John Wells | 23 | Son | Case Handler | Pennsylvania |
| 27 | Joseph Wells | 21 | Son | Truck Driver Helper | Pennsylvania |
| 28 | Albert Wells | 27 | Son | Brake Man | Pennsylvania |
| 29 | Robert Wells | 8 | Grandson | — | Pennsylvania |
| 30 | Robert Wells | 8 | Grandson | — | Pennsylvania |
| 31 | John Conley | 51 | Head | Inspector | Pennsylvania |
| 32 | Johanna Conley | 46 | Wife | — | Pennsylvania |
| 33 | John Conley | 26 | Son | Laborer | Illinois |
| 34 | Ethel Conley | 23 | Daughter | Housekeeper | Pennsylvania |
| 35 | Loraine Conley | 20 | Daughter | Maid | Pennsylvania |
| 36 | William Conley | 18 | Son | New Worker | Pennsylvania |
| 37 | Margaret Conley | 15 | Daughter | — | Pennsylvania |
| 38 | Charles Conley | 15 | Son | — | Pennsylvania |
| 39 | Walter Conley | 13 | Son | — | Pennsylvania |
| 40 | Thomas Conley | 11 | Son | — | Pennsylvania |
Pedigree Summary
James + 3 siblings
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
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)