JC
James Costello — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this James Costello across the 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1918), then head of a 10-person household.
Age 22
b. ~1918
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 | 22 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Assemblyman |
| Industry | Lampworks |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 186 |
| Highest Grade | Hs 1 |
| 1935 Residence | Same Place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Assemblyman |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1918 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Michael Costello | Son | — | 16 | ~1924 |
| Mary Costello | Daughter | — | 24 | ~1916 |
| Teresa Costello | Daughter | — | 14 | ~1926 |
| Bridget Costello | Spouse | — | 42 | ~1898 |
| Joseph Costello | Son | — | 25 | ~1915 |
| William Costello | Son | — | 11 | ~1929 |
| James Costello | Son | — | 22 | ~1918 |
| Dolores Costello | Daughter | — | 10 | ~1930 |
| Martin Costello | Son | — | 19 | ~1921 |
| Martin Costello | Head | — | 56 | ~1884 |
Census Appearances
1930
Allegheny, Pennsylvania
Son, age 12
Allegheny, Pennsylvania · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costilla |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| 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 22
Allegheny-County, Pennsylvania · implied b. ~1918 — 10 household members
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Occupation | Assemblyman |
| Industry | Lampworks |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 186 |
| Highest Grade | Hs 1 |
| 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 James Costello across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Costello
Son · 1940 · age 22 · b. ~1918 · Pennsylvania
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Sibling
Dolores Costello
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Costello
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Costello
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Costello
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Teresa Costello
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martin Costello
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Costello
Sibling · 1940 · age 25
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-t0627-03672-00125)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Louis Roberts | 66 | Head | Janitor & Caretaker | Pennsylvania |
| 42 | Nannie S Roberts | 67 | Wife | — | Pennsylvania |
| 43 | Alex Roberts | 17 | Son | Traveling Salesman | Pennsylvania |
| 44 | Mary Thompson | 70 | Head | — | Scotland |
| 45 | Jean D Hughes | 46 | Daughter | Pressing Operator | Pennsylvania |
| 46 | Chas Hughes | 23 | Grandson | Salesman | Canada English |
| 47 | John Hughes | 18 | Grandson | — | Pennsylvania |
| 48 | Margaret Hughes | 14 | Granddaughter | — | Pennsylvania |
| 49 | James Cook | 46 | Lodger | Millwright | Scotland |
| 50 | Wylie Cooper | 38 | Head | Electrician | Pennsylvania |
| 51 | Marion Cooper | 38 | Wife | — | Pennsylvania |
| 52 | Lucille Cooper | 15 | Daughter | — | Pennsylvania |
| 53 | Elizabeth Shade | 65 | Head | — | Pennsylvania |
| 54 | Frances Flack | 21 | Granddaughter | Stenographer | Pennsylvania |
| 55 | Betty Pinder | 14 | Granddaughter | Newsworker | Pennsylvania |
| 56 | Gerald Pinder | 18 | Grandson | Washing Machine Oper | Pennsylvania |
| 57 | Ida Elder | 49 | Head | Practical Nurse | Michigan |
| 58 | Violet Elder | 27 | Daughter | Hostess | Indiana |
| 59 | Edward Savage | 63 | Head | Patternmaker | Pennsylvania |
| 60 | Mary Savage | 57 | Wife | — | Pennsylvania |
| 61 | William Stewart | 51 | Head | Liquor Salesman | Pennsylvania |
| 62 | Margaret Mosca | 61 | Head | — | Pennsylvania |
| 63 | Victor Mosca | 40 | Son | Shipper | Pennsylvania |
| 64 | Martin Costello | 56 | Head | Freight Handler | Eire |
| 65 | Bridget Costello | 42 | Wife | — | Eire |
| 66 | Joseph Costello | 25 | Son | Mail Clerk | Pennsylvania |
| 67 | Mary Costello | 24 | Daughter | Nurses Aid | Pennsylvania |
| 68 | James Costello THIS PERSON | 22 | Son | Assemblyman | Pennsylvania |
| 69 | Martin Costello | 19 | Son | Laborer | Pennsylvania |
| 70 | Michael Costello | 16 | Son | — | Pennsylvania |
| 71 | Teresa Costello | 14 | Daughter | — | Pennsylvania |
| 72 | William Costello | 11 | Son | — | Pennsylvania |
| 73 | Dolores Costello | 10 | Daughter | — | Pennsylvania |
| 74 | Emmett Smith | 57 | Head | Carpenter | Pennsylvania |
| 75 | Ruth Smith | 34 | Wife | — | Pennsylvania |
| 76 | Fred Reinhart | 54 | Head | Sheet Metal Worker | Pennsylvania |
| 77 | Anna Reinhart | 50 | Wife | — | Ohio |
| 78 | Catherine Troshmanser | 42 | Head | — | Pennsylvania |
| 79 | Nancy Troshmanser | 7 | Daughter | — | Pennsylvania |
| 80 | Michael William Daney | 38 | Head | Maintenance Man | Pennsylvania |
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)