JC
James Callahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this James Callahan across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 9-person household.
Age 11
b. ~1929
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Callahan |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Highest Grade | No 2 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1929 |
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 |
|---|---|---|---|---|
| Robert Callahan | Son | — | 7 | ~1933 |
| Catherine Callahan | Spouse | — | 39 | ~1901 |
| Catherine Callahan | Daughter | — | 15 | ~1925 |
| Francis Callahan | Son | — | 2 | ~1938 |
| Mary Callahan | Daughter | — | 18 | ~1922 |
| Patrick Callahan | Head | — | 45 | ~1895 |
| James Callahan | Son | — | 11 | ~1929 |
| Joseph Callahan | Son | — | 19 | ~1921 |
| William Callahan | Son | — | 9 | ~1931 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 1
Suffolk, Massachusetts · implied b. ~1929 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 11
Suffolk-County, Massachusetts · implied b. ~1929 — 9 household members
| Surname | Callahan |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Highest Grade | No 2 |
| 1935 Residence | Same house |
| 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 11 · b. ~1929 · Massachusetts
★ You are viewing this record
Sibling
Joseph Callahan
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Callahan
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Callahan
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Callahan
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Callahan
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Callahan
Sibling · 1940 · age 9
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
40 people indexed on this census page (nara:1940:m-t0627-01666-00038)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mario Piccini | 7 | Son | — | Massachusetts |
| 42 | Francis Mariani | 46 | Brother | Plasterer | Italy |
| 43 | Marie Mariani | 18 | Niece | Servicing | Italy |
| 44 | Andres Gampochian|Gampochien | 48 | Head | Shoe Worker | Armenia |
| 45 | Mathilda Gampochian|Gampochien | 37 | Wife | Housework | Turkey |
| 46 | John Gampochian|Gampochien | 20 | Son | Clerk | Massachusetts |
| 47 | Angelia Gampochian|Gampochien | 16 | Daughter | — | Massachusetts |
| 48 | Frank Gampochian|Gampochien | 14 | Son | — | Massachusetts |
| 49 | Beatrice Gampochian|Gampochien | 10 | Daughter | — | Massachusetts |
| 50 | Rose Turkomian | 50 | Sister in law | — | Turkey |
| 51 | William Stillings | 46 | Head | Mechanic | Massachusetts |
| 52 | Elizabeth Stillings | 44 | Wife | Housework | Maine |
| 53 | William Moore | 50 | Boarder | Porter | Maine |
| 54 | William Moore | 6 | Nephew | — | Massachusetts |
| 55 | Albert Santacruca | 62 | Head | — | Italy |
| 56 | Katarina Santacruca | 55 | Wife | Housework | Italy |
| 57 | Camilla Santacruca | 26 | Son | Bundle Man | Massachusetts |
| 58 | Thomas Corey | 45 | Head | Laborer | Massachusetts |
| 59 | Annie Corey | 45 | Wife | Housework | Scotland |
| 60 | Thomas Corey | 22 | Son | Laborer | Massachusetts |
| 61 | James Corey | 17 | Son | — | Massachusetts |
| 62 | Marie Corey | 20 | Daughter | — | Massachusetts |
| 63 | Collette Corey | 9 | Daughter | — | Massachusetts |
| 64 | Annie Murphy | 74 | Head | — | Massachusetts |
| 65 | Alice Murphy | 41 | Daughter | Folder | Massachusetts |
| 66 | Nellie Murphy | 34 | Daughter | Skimmer | Massachusetts |
| 67 | Lizzie Marston | 77 | Head | — | Massachusetts |
| 68 | Mary Chase | 55 | Lodger | Sewing | Massachusetts |
| 69 | Mary Morse | 73 | Head | — | New York |
| 70 | Patrick Callahan | 45 | Head | Laborer | Massachusetts |
| 71 | Catherine Callahan | 39 | Wife | Housework | Massachusetts |
| 72 | Joseph Callahan | 19 | Son | — | Massachusetts |
| 73 | Mary Callahan | 18 | Daughter | — | Massachusetts |
| 74 | Catherine Callahan | 15 | Daughter | — | Massachusetts |
| 75 | James Callahan THIS PERSON | 11 | Son | — | Massachusetts |
| 76 | William Callahan | 9 | Son | — | Massachusetts |
| 77 | Robert Callahan | 7 | Son | — | Massachusetts |
| 78 | Francis Callahan | 2 | Son | — | Massachusetts |
| 79 | Lillian Curry | 65 | Head | — | Massachusetts |
| 80 | Lawrence Curry | 24 | Son | Bench Hand | 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)