JC
James Costello — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Kings-County, New York
Our Model Tree links this James Costello across the 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 9-person household.
Age 20
b. ~1920
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Additional Details | |
| Occupation | Office Boy |
| Industry | Brokerage |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 780 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Office Boy |
| Township / Ward | New York City |
| 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Thomas Costello | Head | — | 46 | ~1894 |
| Vincent Costello | Son | — | 11 | ~1929 |
| Patrick Costello | Son | — | 10 | ~1930 |
| Joseph Costello | Son | — | 19 | ~1921 |
| Mary Costello | Daughter | — | 17 | ~1923 |
| Thomas Costello | Son | — | 22 | ~1918 |
| John Costello | Son | — | 14 | ~1926 |
| Catherine Costello | Spouse | — | 45 | ~1895 |
| James Costello | Son | — | 20 | ~1920 |
Census Appearances
1930
Kings, New …
Son, age 10
Kings, New York · implied b. ~1920 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Kings-County, New …
Son, age 20
Kings-County, New York · implied b. ~1920 — 9 household members
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Occupation | Office Boy |
| Industry | Brokerage |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 780 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 20 · b. ~1920 · New York
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Sibling
Joseph Costello
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Costello
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Costello
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Vincent Costello
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Costello
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Costello
Sibling · 1940 · age 17
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 — Kings-County, New York
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02571-00473)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Charles O'Donnell | 34 | Head | Collector | New York |
| 42 | Sarah Dunn | 85 | Head | — | Maryland |
| 43 | Mary Worthington | 69 | Niece | — | New York |
| 44 | Francis Howard | 36 | Grandson | Clerk | New York |
| 45 | Annie Mcenery | 79 | Cousin | — | New York |
| 46 | Martin Walsh | 46 | Head | Watchman | Ireland |
| 47 | Winifred Walsh | 40 | Wife | — | Ireland |
| 48 | Robert Walsh | 18 | Son | — | New York |
| 49 | Joseph Walsh | 11 | Son | — | New York |
| 50 | Harry Rafferty | 40 | Head | Laborer | New York |
| 51 | Alice Rafferty | 23 | Wife | Examiner | New York |
| 52 | Thomas Rafferty | 2 | Son | — | New York |
| 53 | Lawrence Keegan | 76 | Head | — | Eire |
| 54 | Frances Keegan | 40 | Daughter | Secretary | New York |
| 55 | Lawrence Keegan | 37 | Son | Credit Manager | New York |
| 56 | Anna M. Keegan | 33 | Daughter | Secretary | New York |
| 57 | Gerard Galvin | 38 | Head | Elect. Engineer | New York |
| 58 | Loretta Galvin | 37 | Wife | — | New York |
| 59 | Patricia Galvin | 8 | Daughter | — | New York |
| 60 | Richard Galvin | 2 | Son | — | New York |
| 61 | Edward Galvin | 1 | Son | — | New York |
| 62 | Thomas Costello | 46 | Head | Fireman | Eire |
| 63 | Catherine Costello | 45 | Wife | — | Eire |
| 64 | James Costello THIS PERSON | 20 | Son | Office Boy | New York |
| 65 | Joseph Costello | 19 | Son | Bottle Packer | New York |
| 66 | Mary Costello | 17 | Daughter | — | New York |
| 67 | John Costello | 14 | Son | — | New York |
| 68 | Vincent Costello | 11 | Son | — | New York |
| 69 | Patrick R. Costello | 10 | Son | — | New York |
| 70 | Thomas Costello | 22 | Son | Bottle Packer | New York |
| 71 | Arthur Bicknell | 62 | Head | Secretary | England |
| 72 | Anna Bicknell | 52 | Wife | — | Ireland |
| 73 | Ethel Bicknell | 22 | Daughter | Secretary | New York |
| 74 | Arthur Anderson | 33 | Head | Mechanic | New York |
| 75 | Jessie Anderson | 27 | Wife | — | New York |
| 76 | Arthur Anderson | 1 | Son | — | New York |
| 77 | George Carolan | 40 | Head | Motorman | Eire |
| 78 | Bridget Carolan | 38 | Wife | — | Eire |
| 79 | Anna Mary Carolan | 10 | Daughter | — | New York |
| 80 | John Joseph Carolan | 6 | Son | — | New York |
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)