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.~1917), then head of a 7-person household.
Age 23
b. ~1917
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Callahan |
| Given Name | William D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Peabody (City) |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Occupation | Machinist |
| Industry | Machine factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 600 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Machinist |
| Township / Ward | Peabody City |
| Est. Birth Year | ~1917 |
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 |
|---|---|---|---|---|
| Leonard Callahan | Son | — | 17 | ~1923 |
| Margaret Callahan | Daughter | — | 18 | ~1922 |
| William Callahan | Other | — | 79 | ~1861 |
| William Callahan | Head | — | 50 | ~1890 |
| Mary Callahan | Spouse | — | 50 | ~1890 |
| William Callahan | Son | — | 23 | ~1917 |
| Mary Callahan | Daughter | — | 25 | ~1915 |
Census Appearances
1930
Essex, Massachusetts
Son, age 13
Essex, Massachusetts · implied b. ~1917 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | William H. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Connecticut |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Essex-County, Massachusetts
Son, age 23
Essex-County, Massachusetts · implied b. ~1917 — 7 household members
| Surname | Callahan |
| Given Name | William D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Peabody (City) |
| 1935 Residence (County) | Essex |
| Occupation | Machinist |
| Industry | Machine factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 600 |
| Highest Grade | Hs 3 |
| 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 23 · b. ~1917 · Massachusetts
★ You are viewing this record
Sibling
Leonard Callahan
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Callahan
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Callahan
Sibling · 1940 · age 18
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-t0627-01588-00295)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Jennie Opper | 45 | Wife | Housework | Finland |
| 42 | Theodore Opper | 21 | Son | New Worker | Massachusetts |
| 43 | James Fennelly | 75 | Head | — | Massachusetts |
| 44 | Mary E. Fennelly | 77 | Sister | — | Massachusetts |
| 45 | William J. Callahan | 50 | Head | Supervisor | Massachusetts |
| 46 | Mary L. Callahan | 50 | Wife | — | Connecticut |
| 47 | Mary L. Callahan | 25 | Daughter | Dental Assistant | Massachusetts |
| 48 | William D. Callahan THIS PERSON | 23 | Son | Machinist | Massachusetts |
| 49 | Margaret A. Callahan | 18 | Daughter | Clerk | Massachusetts |
| 50 | Leonard E. Callahan | 17 | Son | Clerk | Massachusetts |
| 51 | William J. Callahan | 79 | Uncle | — | Massachusetts |
| 52 | Francis C. Quirk | 41 | Head | Plumber | Massachusetts |
| 53 | Florence E. Quirk | 35 | Wife | — | Massachusetts |
| 54 | Francis C. Quirk | 11 | Son | — | Massachusetts |
| 55 | Marie Quirk | 8 | Daughter | — | Massachusetts |
| 56 | Leo Quirk | 5 | Son | — | Massachusetts |
| 57 | Julia Quirk | 3 | Daughter | — | Massachusetts |
| 58 | Agnes Wade | 25 | Sister | Hairdresser | Massachusetts |
| 59 | Ida Wade | 9 | Niece | — | Massachusetts |
| 60 | John D. Wade | 6 | Nephew | — | Massachusetts |
| 61 | Pauline Toussaint | 19 | Servant | Servant | Vermont |
| 62 | George Freitas | 23 | Head | Embosser | Massachusetts |
| 63 | Eva Freitas | 21 | Wife | Tapper | Massachusetts |
| 64 | George Pappas | 53 | Head | — | Greece |
| 65 | Patra Pappas | 49 | Wife | — | Greece |
| 66 | Ulysses Pasvantis | 30 | Step-son | Tacker | Greece |
| 67 | Laura Pasvantis | 24 | Daughter-in-law | — | Massachusetts |
| 68 | John W. O'Lecka | 45 | Head | Millwright | Russia |
| 69 | Elizabeth O'Lecka | 45 | Wife | — | Finland |
| 70 | Lenore Feldman | 42 | Head | Painter | Russia |
| 71 | Ida Feldman | 39 | Wife | — | Poland |
| 72 | Pauline Feldman | 13 | Daughter | — | Massachusetts |
| 73 | Thelma Feldman | 8 | Daughter | — | Massachusetts |
| 74 | Peter Feldman | 4 | Son | — | Massachusetts |
| 75 | Nicholas Tsaitanos | 46 | Head | Trimmer | Greece |
| 76 | Mary Tsaitanos | 27 | Wife | — | Greece |
| 77 | James Tsaitanos | 9 | Son | — | Massachusetts |
| 78 | Emanuel Tsaitanos | 4 | Son | — | Massachusetts |
| 79 | Arthur Darmuzi | 50 | Head | Beamster | Greece |
| 80 | Despina Darmuzi | 55 | Wife | — | Greece |
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)