JC
James Callahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this James Callahan across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1915), then head of a 13-person household.
Age 25
b. ~1915
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Callahan |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Bedford |
| 1935 Residence (County) | MIDDLESEX |
| Additional Details | |
| Occupation | Clerk |
| Industry | Harvard Library |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 936 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Clerk |
| Township / Ward | Bedford |
| 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.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Bernadine Callahan | Daughter | — | 20 | ~1920 |
| William Callahan | Son | — | 21 | ~1919 |
| Lillian Callahan | Daughter | — | 16 | ~1924 |
| George Callahan | Head | — | 53 | ~1887 |
| Joseph Callahan | Son | — | 30 | ~1910 |
| Mary Callahan | Spouse | — | 57 | ~1883 |
| Thomas Callahan | Son | — | 32 | ~1908 |
| James Callahan | Son | — | 25 | ~1915 |
| Edward Callahan | Son | — | 29 | ~1911 |
| George Callahan | Son | — | 17 | ~1923 |
| Philip Callahan | Son | — | 19 | ~1921 |
| Robert Cosette | Other | — | 3 | ~1937 |
| Francis Callahan | Son | — | 13 | ~1927 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 14
Middlesex, Massachusetts · implied b. ~1916 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 25
Middlesex-County, Massachusetts · implied b. ~1915 — 13 household members
| Surname | Callahan |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Bedford |
| 1935 Residence (County) | MIDDLESEX |
| Occupation | Clerk |
| Industry | Harvard Library |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 936 |
| Highest Grade | Hs 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 Callahan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Callahan
Son · 1940 · age 25 · b. ~1915 · Massachusetts
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Sibling
Joseph Callahan
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Callahan
Sibling · 1940 · age 32
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Callahan
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Callahan
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lillian Callahan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Philip Callahan
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Callahan
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernadine Callahan
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Callahan
Sibling · 1940 · age 13
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01602-00427)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mabel B. Douglas | 19 | Daughter | Mother'S Helper | Massachusetts |
| 2 | Edith Douglas | 17 | Daughter | — | Massachusetts |
| 3 | Kathleen Douglas | 15 | Daughter | — | Massachusetts |
| 4 | Cecil Douglas | 27 | Son | Farmer | Massachusetts |
| 5 | Priscilla Douglas | 24 | Daughter-in-law | — | South Carolina |
| 6 | Norman Douglas | 2 | Grandson | — | Massachusetts |
| 7 | George Callahan | 53 | Head | Taxi Driver | Massachusetts |
| 8 | Mary Callahan | 57 | Wife | — | Newfoundland |
| 9 | Thomas Callahan | 32 | Son | Clerk | Massachusetts |
| 10 | Joseph Callahan | 30 | Son | Clerk | Massachusetts |
| 11 | Edward Callahan | 29 | Son | — | Massachusetts |
| 12 | James Callahan THIS PERSON | 25 | Son | Clerk | Massachusetts |
| 13 | William Callahan | 21 | Son | — | Massachusetts |
| 14 | Bernadine Callahan | 20 | Daughter | — | Massachusetts |
| 15 | Philip Callahan | 19 | Son | — | Massachusetts |
| 16 | George Callahan | 17 | Son | — | Massachusetts |
| 17 | Lillian Callahan | 16 | Daughter | — | Massachusetts |
| 18 | Francis Callahan | 13 | Son | — | Massachusetts |
| 19 | Robert Cosette | 3 | Grandson | — | Massachusetts |
| 20 | Charles Hunt | 46 | Head | Taxi Driver | Massachusetts |
| 21 | Lona P. Hunt | 43 | Wife | — | Massachusetts |
| 22 | Evelyn Hunt | 24 | Daughter | Housekeeper | Massachusetts |
| 23 | Marie Hunt | 21 | Daughter | Clerk | Massachusetts |
| 24 | Bernice Hunt | 18 | Daughter | — | Massachusetts |
| 25 | H. Irving Hunt | 16 | Son | — | Massachusetts |
| 26 | J. Elwood Bixler | 32 | Head | Foreman | Ohio |
| 27 | Elizabeth Bixler | 29 | Wife | — | Massachusetts |
| 28 | Beverly G. Bixler | 5 | Daughter | — | Massachusetts |
| 29 | J. Rodney Bixler | 2 | Son | — | Massachusetts |
| 30 | George J. Wilkins | 48 | Head | Painter | New Brunswick |
| 31 | Sadie Wilkins | 37 | Wife | — | New Brunswick |
| 32 | Edith Joyce Wilkins | 5 | Daughter | — | Massachusetts |
| 33 | John Mcdougal | 36 | Head | Secretary | Massachusetts |
| 34 | Bertha Mcdougal | 34 | Wife | — | Rhode Island |
| 35 | Charles Hume | 39 | Head | Mechanic | Massachusetts |
| 36 | Dorothy Hume | 45 | Wife | — | Massachusetts |
| 37 | Robert Hume | 14 | Ward | — | Massachusetts |
| 38 | Walter Gibbs | 76 | Father-in-law | — | Massachusetts |
| 39 | Theodore Davis | 41 | Head | Attendant | Vermont |
| 40 | Edward Davis | 15 | Son | — | Rhode Island |
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)