JC
John Callahan — 1940 US Census Record
Linked across censuses1940 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) — first a head (b.~1866), then head of a 3-person household.
Age 74
b. ~1866
Male
Head
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 74 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Somerville |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Additional Details | |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Somerville |
| Est. Birth Year | ~1866 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Callahan | Head | — | 74 | ~1866 |
| Charles Callahan | Son | — | 36 | ~1904 |
| Elizabeth Callahan | Spouse | — | 71 | ~1869 |
Census Appearances
1920
Essex, Massachusetts
Head, age 55
Essex, Massachusetts · implied b. ~1865 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1889 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | helper |
| Industry | electrical shop |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | Ireland |
| Year of Naturalization | 1894 |
| Birthplace (normalized) | ireland |
1930
Essex, Massachusetts
Head, age 64
Essex, Massachusetts · implied b. ~1866 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 64 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1884 |
| Age at First Marriage | 32 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 52 |
| Radio Set | R |
| Veteran | No |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Middlesex-County, Massachusetts
Head, age 74
Middlesex-County, Massachusetts · implied b. ~1866 — 3 household members
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 74 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Somerville |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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.
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This person
Anchor record
John Callahan
Head · 1940 · age 74 · b. ~1866 · Massachusetts
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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-t0627-01702-00513)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Salvatore Langy | 56 | Head | Barber | Italy |
| 2 | Luigi Langy | 24 | Son | Packer | Italy |
| 3 | Albert Langy | 18 | Son | — | Massachusetts |
| 4 | Flora Langy | 15 | Daughter | — | Massachusetts |
| 5 | Edel Saffery | 56 | Head | — | Massachusetts |
| 6 | John Evans | 68 | Boarder | — | Massachusetts |
| 7 | John Callahan THIS PERSON | 74 | Head | — | Ireland |
| 8 | Elizabeth Callahan | 71 | Wife | — | Ireland |
| 9 | Charles Callahan | 36 | Son | Laborer | Massachusetts |
| 10 | Joseph Giunchetti | 58 | Head | — | Italy |
| 11 | Louise Giunchetti | 47 | Wife | Stitcher | Italy |
| 12 | Vilda Giunchetti | 15 | Daughter | Trimmer | Italy |
| 13 | Nicholas Albano | 34 | Head | Laborer | Italy |
| 14 | Mary Albano | 23 | Wife | — | Massachusetts |
| 15 | Charles Albano | 1 | Son | — | Massachusetts |
| 16 | Nicholas Papadimitrion | 54 | Head | Laborer | Turkey |
| 17 | Stamatike Papadimitrion | 40 | Wife | — | Turkey |
| 18 | Catherine Papadimitrion | 15 | Daughter | — | Greece |
| 19 | Oreste Magliozzi | 52 | Head | Sole-Cutter | Italy |
| 20 | Joseph Magliozzi | 25 | Son | Barber | Italy |
| 21 | Mario Magliozzi | 18 | Son | Carpenter | Massachusetts |
| 22 | Peter Scaringi | 22 | Head | Musician | New York |
| 23 | Florence Scaringi | 27 | Wife | — | Massachusetts |
| 24 | Richard Scaringi | 4 | Son | — | Massachusetts |
| 25 | Max Datilii | 33 | Head | Laborer | Massachusetts |
| 26 | Gene Datilii | 15 | Daughter | — | Massachusetts |
| 27 | Joan Datilii | 10 | Daughter | — | Massachusetts |
| 28 | Catherine Fiore | 60 | Head | — | Italy |
| 29 | Alphonso Moratta | 20 | Son | Clerk | Massachusetts |
| 30 | Anton Poutridakis | 48 | Head | Delivery Man | Greece |
| 31 | Katherine Poutridakis | 41 | Wife | — | Greece |
| 32 | George Poutridakis | 23 | Son | Chocolate-Mixer | Massachusetts |
| 33 | Bessie Poutridakis | 20 | Daughter | Controller | Massachusetts |
| 34 | James Poutridakis | 16 | Son | — | Massachusetts |
| 35 | John Poutridakis | 11 | Son | — | Massachusetts |
| 36 | Grace La Fance | 69 | Head | — | Italy |
| 37 | Joseph La Fance | 33 | Son | Accountant | Massachusetts |
| 38 | Santo Lanfante | 36 | Head | Side Loader | Italy |
| 39 | Celestine Lanfante | 32 | Wife | — | Massachusetts |
| 40 | Anthony Lanfante | 6 | 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)