WC
William Callahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this William Callahan across the 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 7-person household.
Age 20
b. ~1920
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Callahan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Danvers Town |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Occupation | Lamp worker |
| Industry | Lamp Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 400 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Lamp Worker |
| Township / Ward | Danvers Town |
| Est. Birth Year | ~1920 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| James Callahan | Son | — | 25 | ~1915 |
| Michael Callahan | Head | — | 71 | ~1869 |
| William Callahan | Son | — | 20 | ~1920 |
| Julia Callahan | Spouse | — | 62 | ~1878 |
| Anna Callahan | Daughter | — | 18 | ~1922 |
| John Callahan | Son | — | 34 | ~1906 |
| Frank Callahan | Son | — | 22 | ~1918 |
Census Appearances
1930
Essex, Massachusetts
Son, age 10
Essex, Massachusetts · implied b. ~1920 — 13 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Essex-County, Massachusetts
Son, age 20
Essex-County, Massachusetts · implied b. ~1920 — 7 household members
| Surname | Callahan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Danvers Town |
| 1935 Residence (County) | Essex |
| Occupation | Lamp worker |
| Industry | Lamp Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 400 |
| Highest Grade | Hs 4 |
| 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 William Callahan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Callahan
Son · 1940 · age 20 · b. ~1920 · Massachusetts
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Sibling
John Callahan
Sibling · 1940 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Callahan
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Callahan
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Callahan
Sibling · 1940 · age 22
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-t0627-01579-00060)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Laura Valcorno | 47 | Wife | — | Massachusetts |
| 42 | Roger Valcorno | 20 | Son | Box Maker | Massachusetts |
| 43 | Albert Valcorno | 17 | Son | Pin Boy | Massachusetts |
| 44 | Victor Valcorno | 13 | Son | — | Massachusetts |
| 45 | Theresa Valcorno | 12 | Daughter | — | Massachusetts |
| 46 | Donald Valcorno | 7 | Son | — | Massachusetts |
| 47 | Thomas H. Tardiff | 28 | Son-in-law | Truck Driver | Massachusetts |
| 48 | Janette Tardiff | 21 | Daughter | Shoe Worker | Massachusetts |
| 49 | Joseph Blanchette | 76 | Head | Barber | Canada |
| 50 | Jennie Blanchette | 65 | Wife | — | New Hampshire |
| 51 | Willard F. Milberry | 64 | Head | Cook | Canada |
| 52 | Eva E. Milberry | 56 | Wife | — | Canada |
| 53 | Dora Conway | 32 | Daughter | — | Massachusetts |
| 54 | Robert B. Conway | 6 | Grandson | — | Massachusetts |
| 55 | Mary A. Conway | 3 | Granddaughter | — | Massachusetts |
| 56 | Michael F. Callahan | 71 | Head | Stationary Fireman | Irish Free State |
| 57 | Julia F. Callahan | 62 | Wife | — | Irish Free State |
| 58 | John Callahan | 34 | Son | Carpenter | Massachusetts |
| 59 | James Callahan | 25 | Son | Truck Driver | Massachusetts |
| 60 | Frank Callahan | 22 | Son | Leather Worker | Massachusetts |
| 61 | William Callahan THIS PERSON | 20 | Son | Lamp Worker | Massachusetts |
| 62 | Anna Callahan | 18 | Daughter | New Worker | Massachusetts |
| 63 | Reginald L. Caron | 32 | Head | Rent Agent | Massachusetts |
| 64 | Maude A. Caron | 35 | Wife | — | England |
| 65 | Sybil V. Caron | 12 | Daughter | — | Massachusetts |
| 66 | Charlie L. Caron | 6 | Son | — | Massachusetts |
| 67 | Hester Macdonald | 59 | Mother | — | England |
| 68 | Curtis J. Reid | 45 | Head | Clerk | Massachusetts |
| 69 | Margaret R. Reid | 45 | Wife | — | Massachusetts |
| 70 | Margaret M. Reid | 20 | Daughter | Leather Worker | Massachusetts |
| 71 | Ida B. Cyr | 43 | Head | — | Massachusetts |
| 72 | Claude Cyr | 17 | Son | — | Massachusetts |
| 73 | Irene Cyr | 12 | Son | — | Massachusetts |
| 74 | Roger Cyr | 10 | Son | — | Massachusetts |
| 75 | Donald Cyr | 6 | Son | — | Massachusetts |
| 76 | Samuel R. Hinkston | 45 | Head | Partner | Massachusetts |
| 77 | Margaret L. Hinkston | 46 | Wife | — | Massachusetts |
| 78 | John J. Hinkston | 25 | Son | Carpenter | Massachusetts |
| 79 | George R. Hinkston | 22 | Son | Cabinet Maker | Massachusetts |
| 80 | Robert L. Hinkston | 20 | Son | Carpenter | 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)