JC
James Costello — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this James Costello across the 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 8-person household.
Age 19
b. ~1921
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Costello |
| Given Name | James |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Haverhill City |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Occupation | Steamfitter |
| Industry | Furnace Company |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 560 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Steamfitter |
| Township / Ward | Haverhill City |
| Est. Birth Year | ~1921 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| James Costello | Son | — | 19 | ~1921 |
| Patricia Costello | Daughter | — | 18 | ~1922 |
| Philip Costello | Son | — | 16 | ~1924 |
| Robert Costello | Son | — | 23 | ~1917 |
| James Costello | Head | — | 50 | ~1890 |
| Barbara Costello | Daughter | — | 15 | ~1925 |
| Evelyn Costello | Spouse | — | 49 | ~1891 |
| Margaret Costello | Daughter | — | 20 | ~1920 |
Census Appearances
1930
Essex, Massachusetts
Son, age 10
Essex, Massachusetts · implied b. ~1920 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Castello |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| 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
Essex-County, Massachusetts
Son, age 19
Essex-County, Massachusetts · implied b. ~1921 — 8 household members
| Surname | Costello |
| Given Name | James |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Haverhill City |
| 1935 Residence (County) | Essex |
| Occupation | Steamfitter |
| Industry | Furnace Company |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 560 |
| Highest Grade | H 4 |
| 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 19 · b. ~1921 · Massachusetts
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Sibling
Patricia Costello
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Costello
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Philip Costello
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Costello
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Barbara Costello
Sibling · 1940 · age 15
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 — Essex-County, Massachusetts
Open full size
1940 US Federal Census — Essex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01581-00529)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary Carney | 70 | head | — | Ireland |
| 42 | Lewis Carney | 40 | son | Musician | Massachusetts |
| 43 | Cornelius P. Driscoll | 44 | head | Superintendent | Massachusetts |
| 44 | Pearl Driscoll | 33 | wife | — | Russia |
| 45 | Jo Anne Driscoll | 9 | daughter | — | Massachusetts |
| 46 | Cornelius F. Driscoll | 5 | son | — | Massachusetts |
| 47 | Jerome Driscoll | 2 | son | — | Massachusetts |
| 48 | Frederick Michael Driscoll | 59 | father-in-law | — | Russia |
| 49 | John Di Tommaso | 39 | head | Proprietor | Massachusetts |
| 50 | Wilda Di Tommaso | 38 | wife | — | Massachusetts |
| 51 | Lynda Di Tommaso | 5 | daughter | — | Massachusetts |
| 52 | Benjamin Diego | 35 | head | Chemist | Pennsylvania |
| 53 | Hazel Diego | 32 | wife | — | Massachusetts |
| 54 | Dorothy Diego | 9 | daughter | — | Massachusetts |
| 55 | David Diego | 8 | son | — | Massachusetts |
| 56 | Virginia Diego | 5 | daughter | — | Massachusetts |
| 57 | Nelson J. Hamelo | 43 | head | Proprietor | Quebec |
| 58 | Hazel Hamelo | 42 | wife | — | New Hampshire |
| 59 | Janice Hamelo | 7 | daughter | — | Massachusetts |
| 60 | Sandra Hamelo | 4 | daughter | — | Massachusetts |
| 61 | Helen Martin | 53 | head | — | New Hampshire |
| 62 | John Donahue | 35 | lodger | Clerk | Massachusetts |
| 63 | Bernice A. Mccaffrey | 58 | head | — | Vermont |
| 64 | Donald J. Mccaffrey | 23 | son | — | Massachusetts |
| 65 | Carl S. Noyes | 30 | head | Clerk | Massachusetts |
| 66 | Gertrude L. Noyes | 29 | wife | — | Massachusetts |
| 67 | Judith Noyes | 2 | daughter | — | Massachusetts |
| 68 | James Costello | 50 | head | Alderman | Massachusetts |
| 69 | Evelyn Costello | 49 | wife | — | Massachusetts |
| 70 | Robert Costello | 23 | son | Laborer | Massachusetts |
| 71 | Margaret Costello | 20 | daughter | Stenographer | Massachusetts |
| 72 | James Costello THIS PERSON | 19 | son | Steamfitter | Massachusetts |
| 73 | Patricia Costello | 18 | daughter | — | Massachusetts |
| 74 | Philip Costello | 16 | son | — | Massachusetts |
| 75 | Barbara Costello | 15 | daughter | — | Massachusetts |
| 76 | Purely Wyman | 54 | head | Electrician Helper | Massachusetts |
| 77 | Beatrice Wyman | 50 | wife | Nurse | Vermont |
| 78 | Joseph A. Ruel | 60 | head | Medical Doctor | New Hampshire |
| 79 | Corrine Ruel | 55 | wife | — | Massachusetts |
| 80 | Margery Ruel | 15 | daughter | — | 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)