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.~1923), then head of a 9-person household.
Age 17
b. ~1923
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 | 17 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city - part (Hyde Park) |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City Part Hyde Park |
| Est. Birth Year | ~1923 |
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 |
|---|---|---|---|---|
| Margaret Costello | Daughter | — | 25 | ~1915 |
| Richard Costello | Son | — | 13 | ~1927 |
| Mary Costello | Daughter | — | 21 | ~1919 |
| Redmond Costello | Son | — | 19 | ~1921 |
| Rita Costello | Daughter | — | 15 | ~1925 |
| Francis Costello | Son | — | 23 | ~1917 |
| James Costello | Son | — | 17 | ~1923 |
| Bridget Costello | Spouse | — | 53 | ~1887 |
| Thomas Costello | Head | — | 65 | ~1875 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 6
Suffolk, Massachusetts · implied b. ~1924 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland-Free State |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 17
Suffolk-County, Massachusetts · implied b. ~1923 — 9 household members
| Surname | Costello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city - part (Hyde Park) |
| 1935 Residence (County) | Suffolk |
| Income (1939) | 0 |
| Highest Grade | Hs 1 |
| 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 17 · b. ~1923 · Massachusetts
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Sibling
Rita Costello
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Costello
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Costello
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Costello
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Redmond Costello
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Costello
Sibling · 1940 · age 21
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
39 people indexed on this census page (nara:1940:m-t0627-01678-00147)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Abraham Labovitch | 46 | Head | Baker | Rumania |
| 2 | Gertrude Labovitch | 46 | Wife | Housewife | Rumania |
| 3 | Evelyn Labovitch | 20 | Daughter | New Worker | Massachusetts |
| 4 | Harry Labovitch | 10 | Son | — | Massachusetts |
| 5 | Leo Labovitch | 8 | Son | — | Massachusetts |
| 6 | Elizabeth Glennon | 74 | Head | Housewife | Eire |
| 7 | Margaret Glennon | 33 | Daughter | Teacher | Massachusetts |
| 8 | Owen Mcdermott | 69 | Head | Blacksmith | Northern Ireland |
| 9 | Mary Mcdermott | 59 | Wife | Housewife | Eire |
| 10 | Anna Rita Mcdermott | 22 | Daughter | Stenographer | Massachusetts |
| 11 | Stanley Olazewski | 48 | Head | Laborer | Poland |
| 12 | Blanche Olazewski | 48 | Wife | Housewife | Poland |
| 13 | Henrietta Olazewski | 20 | Daughter | Attendant | Massachusetts |
| 14 | Maria Olazewski | 18 | Daughter | Housework | Massachusetts |
| 15 | Walter Olazewski | 16 | Son | — | Massachusetts |
| 16 | Stella Olazewski | 15 | Daughter | — | Massachusetts |
| 17 | Stacia Richards | 34 | Head | Housewife | Russia |
| 18 | Loraine Richards | 12 | Daughter | — | Massachusetts |
| 19 | John Richards | 9 | Son | — | Massachusetts |
| 20 | Thomas Costello | 65 | Head | Janitor | Eire |
| 21 | Bridget Costello | 53 | Wife | Housewife | Eire |
| 22 | Margaret Costello | 25 | Daughter | Stenographer | Massachusetts |
| 23 | Francis Costello | 23 | Son | Clerk | Massachusetts |
| 24 | Mary Costello | 21 | Daughter | Comptometer Operator | Massachusetts |
| 25 | Redmond Costello | 19 | Son | — | Massachusetts |
| 26 | James Costello THIS PERSON | 17 | Son | — | Massachusetts |
| 27 | Rita Costello | 15 | Daughter | — | Massachusetts |
| 28 | Richard Costello | 13 | Son | — | Massachusetts |
| 30 | Michael J. Dray | 41 | Head | Attorney | Massachusetts |
| 31 | Gertrude D. Dray | 38 | Wife | Housewife | Massachusetts |
| 32 | Robert Dray | 9 | Son | — | Massachusetts |
| 33 | Nancy Dray | 7 | Daughter | — | Massachusetts |
| 34 | Richard Dray | 5 | Son | — | Massachusetts |
| 35 | Betsy Dray | 2 | Daughter | — | Massachusetts |
| 36 | Mary Boyles | 66 | Mother-in-law | Housework | Massachusetts |
| 37 | Francis Mahoney | 31 | Head | Photographer | Massachusetts |
| 38 | Catherine Mahoney | 25 | Wife | Housewife | Massachusetts |
| 39 | John L. Mahoney | 53 | Head | Telegrapher | Massachusetts |
| 40 | Margaret M. Mahoney | 50 | Wife | Housewife | Canada-English |
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)