JC
James Costello — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this James Costello across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1915), then head of a 7-person household.
Age 25
b. ~1915
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Pressman |
| Industry | Button shop |
| Class of Worker | PW |
| Hours Worked | 13 |
| Income (1939) | 750 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Pressman |
| Township / Ward | Boston City |
| 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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Margaret Costello | Daughter | — | 21 | ~1919 |
| Charles Costello | Son | — | 17 | ~1923 |
| James Costello | Son | — | 25 | ~1915 |
| Margaret Costello | Spouse | — | 57 | ~1883 |
| Thomas Costello | Head | — | 62 | ~1878 |
| Michael Costello | Son | — | 23 | ~1917 |
| Lawrence Costello | Son | — | 20 | ~1920 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 15
Suffolk, Massachusetts · implied b. ~1915 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 25
Suffolk-County, Massachusetts · implied b. ~1915 — 7 household members
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Occupation | Pressman |
| Industry | Button shop |
| Class of Worker | PW |
| Hours Worked | 13 |
| Income (1939) | 750 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 25 · b. ~1915 · Massachusetts
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Sibling
Margaret Costello
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Costello
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Costello
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles 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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01659-00554)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Joseph Berman | 38 | Head | Painter | Massachusetts |
| 42 | Mary Berman | 37 | Wife | — | Massachusetts |
| 43 | Dorothy Berman | 17 | Daughter | — | Massachusetts |
| 44 | Joseph Berman | 14 | Son | — | Massachusetts |
| 45 | Robert Berman | 12 | Son | — | Massachusetts |
| 46 | Joan Berman | 10 | Daughter | — | Massachusetts |
| 47 | John Berman | 8 | Son | — | Massachusetts |
| 48 | Francis Berman | 7 | Daughter | — | Massachusetts |
| 49 | Thomas Costello | 62 | Head | Laborer | Eire |
| 50 | Margaret Costello | 57 | Wife | — | Eire |
| 51 | James Costello THIS PERSON | 25 | Son | Pressman | Massachusetts |
| 52 | Michael Costello | 23 | Son | Laborer | Massachusetts |
| 53 | Margaret Costello | 21 | Daughter | New Worker | Massachusetts |
| 54 | Lawrence Costello | 20 | Son | New Worker | Massachusetts |
| 55 | Charles Costello | 17 | Son | — | Massachusetts |
| 56 | Emma Collon | 52 | Head | Cleaner | Massachusetts |
| 57 | John Collon | 26 | Son | Instructor | Massachusetts |
| 58 | Richard Collon | 23 | Son | Porter | Massachusetts |
| 59 | James Collon | 20 | Son | — | Massachusetts |
| 60 | Robert Collon | 17 | Son | — | Massachusetts |
| 61 | Joseph Collon | 13 | Son | — | Massachusetts |
| 62 | Bryan Collon | 11 | Son | — | Massachusetts |
| 63 | Elizabeth Green | 35 | Head | Seamstress | Massachusetts |
| 64 | Geraldine Green | 12 | Daughter | — | Massachusetts |
| 65 | William Green | 7 | Son | — | Massachusetts |
| 66 | James Healey | 34 | Head | Laborer | Eire |
| 67 | Margaret Healey | 34 | Wife | — | Eire |
| 68 | Helen Healey | 13 | Daughter | — | Massachusetts |
| 69 | John Healey | 12 | Son | — | Massachusetts |
| 70 | Margaret Healey | 10 | Daughter | — | Massachusetts |
| 71 | Virginia Healey | 8 | Daughter | — | Massachusetts |
| 72 | Catharine Healey | 3 | Daughter | — | Massachusetts |
| 73 | Susan Cassidy | 38 | Head | — | Massachusetts |
| 74 | Edward Cassidy | 20 | Son | Hod Carrier | Massachusetts |
| 75 | Eileen Cassidy | 19 | Daughter | — | Massachusetts |
| 76 | Robert Cassidy | 11 | Son | — | Massachusetts |
| 77 | Inez Bolduc | 51 | Head | — | Canada French |
| 78 | Mary Bolduc | 30 | Daughter | Beautician | Massachusetts |
| 79 | Adelbert Bolduc | 21 | Son | Route Clerk | Massachusetts |
| 80 | Joseph Bolduc | 17 | Son | — | Massachusetts |
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)