JC
John Callahan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Callahan across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Sarah & Patrick — first a head (b.~1916), then head of a 5-person household.
Age 24
b. ~1916
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Callahan |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Winchester |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Embosser |
| Industry | Tannery |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1964 |
| Highest Grade | H 4 |
| 1935 Residence | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Embosser |
| Township / Ward | Woburn City |
| Est. Birth Year | ~1916 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Callahan | Head | — | 24 | ~1916 |
| Patricia Smith | Other | — | 3 | ~1937 |
| Mary Smith | Other | — | 27 | ~1913 |
| John Callahan | Son | — | 1 | ~1939 |
| Agnes Callahan | Spouse | — | 32 | ~1908 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 3
Middlesex, Massachusetts · implied b. ~1917 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 14
Middlesex, Massachusetts · implied b. ~1916 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | John |
| 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
Head, age 24
Middlesex-County, Massachusetts · implied b. ~1916 — 5 household members
| Surname | Callahan |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Winchester |
| 1935 Residence (County) | Middlesex |
| Occupation | Embosser |
| Industry | Tannery |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1964 |
| Highest Grade | H 4 |
| 1935 Residence | Massachusetts |
| 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 John Callahan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Sarah Callahan (~0.92 confidence) and father Patrick Callahan (~0.92 confidence) and father John Callahan (~0.92 confidence) and mother Catherine Callahan (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Sarah Callahan
b. ~1883
Source mother
● Household
· direct · ~0.92
Father
Patrick Callahan
b. ~1884
Source father
● Household
· direct · ~0.92
Father
John Callahan
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Catherine Callahan
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Callahan
Head · 1940 · age 24 · b. ~1916 · Massachusetts
★ You are viewing this record
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-t0627-01622-00582)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Bernard Moriarty | 42 | Head | Printer | Massachusetts |
| 2 | Catherine Moriarty | 42 | Wife | — | Massachusetts |
| 3 | Mary Moriarty | 20 | Daughter | Stenographer | Massachusetts |
| 4 | Bernice Moriarty | 20 | Daughter | Housekeeper | Massachusetts |
| 5 | Bernard Jr. Moriarty | 18 | Son | — | Massachusetts |
| 6 | Alice Moriarty | 16 | Daughter | — | Massachusetts |
| 7 | Albert Moriarty | 10 | Son | — | Massachusetts |
| 8 | Leo Murphy | 44 | Head | Crane Operator | Massachusetts |
| 9 | Marion Murphy | 41 | Wife | Clerk | Massachusetts |
| 10 | Helen Murphy | 37 | Sister | Map Maker | Massachusetts |
| 11 | Joseph Doherty | 36 | Head | Policeman | Massachusetts |
| 12 | Elizabeth Doherty | 34 | Wife | — | Massachusetts |
| 13 | Joseph Jr. Doherty | 2 | Son | — | Massachusetts |
| 14 | John Taffney | 26 | Head | Printer | Massachusetts |
| 15 | Mary Taffney | 29 | Wife | — | Massachusetts |
| 16 | Joan Taffney | 3 | Daughter | — | Massachusetts |
| 17 | Carol Taffney | 2 | Daughter | — | Massachusetts |
| 18 | John H. Callahan THIS PERSON | 24 | Head | Embosser | Massachusetts |
| 19 | Agnes Callahan | 32 | Wife | — | Massachusetts |
| 20 | John Jr. Callahan | 1 | Son | — | Massachusetts |
| 21 | Mary Smith | 27 | Lodger | Clerk | Massachusetts |
| 22 | Patricia Smith | 3 | Lodger | — | Massachusetts |
| 23 | Edward Boyle | 44 | Head | Lawyer | Massachusetts |
| 24 | Isabel Boyle | 43 | Wife | — | Massachusetts |
| 25 | Edward Jr. Boyle | 17 | Son | — | Massachusetts |
| 26 | Robert Boyle | 14 | Son | — | Massachusetts |
| 27 | Gerard Boyle | 8 | Son | — | Massachusetts |
| 28 | Charles Ranney | 46 | Head | Carpenter | Massachusetts |
| 29 | Anna Ranney | 43 | Wife | — | Massachusetts |
| 30 | Joan Ranney | 15 | Daughter | — | Massachusetts |
| 31 | Mary Ranney | 13 | Daughter | — | Massachusetts |
| 32 | John Ranney | 9 | Son | — | Massachusetts |
| 33 | Thomas Snider | 56 | Head | Engineer | Canada |
| 34 | Margaret Snider | 50 | Wife | — | Massachusetts |
| 35 | Shirley Snider | 17 | Daughter | — | Massachusetts |
| 36 | Thomas Snider | 14 | Son | — | Massachusetts |
| 37 | Paul Snider | 6 | Son | — | Massachusetts |
| 38 | Sidney Adams | 42 | Head | Optician | Massachusetts |
| 39 | Marguerite Adams | 36 | Wife | — | Massachusetts |
| 40 | Barbara Adams | 15 | Daughter | — | Massachusetts |
Pedigree Summary
John
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)