JC
John Costello — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lorain-County, Ohio
Our Model Tree links this John Costello across the 1930 and 1940 US Censuses in Lorain-County, Ohio (XGBoost, ~Confirmed) — first a son (b.~1913), then head of a 10-person household.
Age 27
b. ~1913
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lorain-County, Ohio |
| Surname | Costello |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Lorain City |
| 1935 Residence (County) | Lorain |
| Additional Details | |
| Occupation | laborer |
| Industry | steel-mill |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 600 |
| Highest Grade | H-1 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Laborer |
| Township / Ward | Lorain City |
| Est. Birth Year | ~1913 |
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 |
|---|---|---|---|---|
| Charles Costello | Son | — | 20 | ~1920 |
| Phillip Costello | Son | — | 19 | ~1921 |
| Peter Costello | Head | — | 56 | ~1884 |
| Peter Costello | Son | — | 14 | ~1926 |
| Frances Costello | Daughter | — | 16 | ~1924 |
| Steve Costello | Son | — | 25 | ~1915 |
| John Costello | Son | — | 27 | ~1913 |
| Madeline Costello | Spouse | — | 55 | ~1885 |
| Joe Costello | Son | — | 24 | ~1916 |
| Magdalene Costello | Daughter | — | 11 | ~1929 |
Census Appearances
1930
Lorain, Ohio
Son, age 18
Lorain, Ohio · implied b. ~1912 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Castello |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Italy |
| Mother's Birthplace | Italy |
| Occupation | Laborer |
| Industry | Automobile Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Lorain-County, Ohio
Son, age 27
Lorain-County, Ohio · implied b. ~1913 — 10 household members
| Surname | Costello |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Lorain City |
| 1935 Residence (County) | Lorain |
| Occupation | laborer |
| Industry | steel-mill |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 600 |
| Highest Grade | H-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 John Costello across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Costello
Son · 1940 · age 27 · b. ~1913 · Ohio
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Sibling
Charles Costello
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Steve Costello
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Phillip Costello
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joe Costello
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Magdalene Costello
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Costello
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Peter Costello
Sibling · 1940 · age 14
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 — Lorain-County, Ohio
Open full size
1940 US Federal Census — Lorain-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03102-00415)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Florian Paul | 58 | Head | Grinder | Yugoslavia |
| 2 | Johanna Paul | 53 | Wife | — | Yugoslavia |
| 3 | Frank Paul | 24 | Son | Laborer | Ohio |
| 4 | Joseph Paul | 22 | Son | Laborer | Ohio |
| 5 | Florian Paul | 11 | Son | — | Ohio |
| 6 | Patrick Costello | 28 | Head | Press Operator | Pennsylvania |
| 7 | Theresa Costello | 25 | Wife | — | Ohio |
| 8 | Patrick Jr. Costello | 3 | Son | — | Ohio |
| 9 | Sam Rossi | 30 | Head | Boiler Maker | Italy |
| 10 | Mary Rossi | 34 | Wife | Seamstress | Italy |
| 11 | Irma Rossi | 1 | Daughter | — | Ohio |
| 12 | Peter Costello | 56 | Head | Laborer | Italy |
| 13 | Madeline Costello | 55 | Wife | — | Italy |
| 14 | John Costello THIS PERSON | 27 | Son | Laborer | Pennsylvania |
| 15 | Steve Costello | 25 | Son | Laborer | Pennsylvania |
| 16 | Joe Costello | 24 | Son | Laborer | Pennsylvania |
| 17 | Charles Costello | 20 | Son | Presser | Pennsylvania |
| 18 | Phillip Costello | 19 | Son | New Worker | Pennsylvania |
| 19 | Frances Costello | 16 | Daughter | Maid | Pennsylvania |
| 20 | Peter Jr. Costello | 14 | Son | — | Pennsylvania |
| 21 | Magdalene Costello | 11 | Daughter | — | Ohio |
| 22 | Dominick Sestili | 54 | Head | Laborer | Italy |
| 23 | Maria Sestili | 48 | Wife | — | Italy |
| 24 | Paul Sestili | 31 | Son | Laborer | Italy |
| 25 | Michael Poli | 22 | Step-son | Laborer | Pennsylvania |
| 26 | Helen Sestili | 20 | Daughter | Housekeeper | Ohio |
| 27 | Magdalene Sestili | 18 | Daughter | — | Ohio |
| 28 | Rose Sestili | 16 | Daughter | — | Ohio |
| 29 | Theresa Sestili | 16 | Daughter | — | Ohio |
| 30 | Sylvia Sestili | 13 | Daughter | — | Ohio |
| 31 | Elmira Sestili | 12 | Daughter | — | Ohio |
| 32 | Joseph Mattei | 43 | Head | Crane Helper | Italy |
| 33 | Mary Mattei | 25 | Wife | — | New Jersey |
| 34 | Emidio Mattei | 40 | Brother | Laborer | Italy |
| 35 | Livia Mattei | 24 | Sister-in-law | — | Pennsylvania |
| 36 | Theresa Mattei | 72 | Mother | — | Italy |
| 37 | Nick Broglio | 24 | Head | Shipper | Pennsylvania |
| 38 | Anne Broglio | 20 | Wife | — | Pennsylvania |
| 39 | Rose Broglio | 64 | Mother | — | Italy |
| 40 | Andrew Kordelski | 24 | Head | Laborer | Ohio |
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)