MC
Margaret Callahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Margaret Callahan across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1909), then head of a 8-person household.
Age 31
b. ~1909
Female
Spouse
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Callahan |
| Given Name | Margaret M. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | WINCHESTER |
| 1935 Residence (County) | MIDDLESEX |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Winchester |
| Est. Birth Year | ~1909 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Paul Callahan | Son | — | 5 | ~1935 |
| John Callahan | Son | — | 10 | ~1930 |
| Michael Callahan | Son | — | 1 | ~1939 |
| John Callahan | Head | — | 37 | ~1903 |
| Lawrence Callahan | Son | — | 7 | ~1933 |
| Catherine Callahan | Daughter | — | 4 | ~1936 |
| Marguerite Callahan | Daughter | — | 9 | ~1931 |
| Margaret Callahan | Spouse | — | 31 | ~1909 |
Census Appearances
1930
Middlesex, Massachusetts
Spouse, age 21
Middlesex, Massachusetts · implied b. ~1909 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | Margaret M. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 19 |
| Father's Birthplace | New York |
| Mother's Birthplace | England |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 31
Middlesex-County, Massachusetts · implied b. ~1909 — 8 household members
| Surname | Callahan |
| Given Name | Margaret M. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | WINCHESTER |
| 1935 Residence (County) | MIDDLESEX |
| 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 Margaret Callahan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Margaret Callahan
Spouse · 1940 · age 31 · b. ~1909 · 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-t0627-01622-00005)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Christopher H. Powers | 36 | Head | Dealer | Massachusetts |
| 2 | Inez Powers | 27 | Wife | — | Massachusetts |
| 3 | Aline Powers | 5 | Daughter | — | Massachusetts |
| 4 | Christina Powers | 1 | Daughter | — | Massachusetts |
| 5 | David Meshell | 75 | Head | Gardener | Irish Free State |
| 6 | Julia T. Meshell | 43 | Daughter | Amusement | Massachusetts |
| 7 | John Joseph Callahan | 37 | Head | Traffic Officer | Massachusetts |
| 8 | Margaret M. Callahan THIS PERSON | 31 | Wife | — | Massachusetts |
| 9 | John Callahan | 10 | Son | — | Massachusetts |
| 10 | Marguerite Callahan | 9 | Daughter | — | Massachusetts |
| 11 | Lawrence Callahan | 7 | Son | — | Massachusetts |
| 12 | Paul Callahan | 5 | Son | — | Massachusetts |
| 13 | Catherine Callahan | 4 | Daughter | — | Massachusetts |
| 14 | Michael Callahan | 1 | Son | — | Massachusetts |
| 15 | Michael P. Murphy | 77 | Head | Painter | Irish Free State |
| 16 | Abbie M. Murphy | 60 | Wife | — | Irish Free State |
| 17 | Thomas Murphy | 25 | Son | Employee | Massachusetts |
| 18 | Robert Murphy | 24 | Son | Truck Driver | Massachusetts |
| 19 | Patrick Mcgowan | 75 | Head | Currier | Irish Free State |
| 20 | Sarah Mcgowan | 35 | Daughter | Cook | Massachusetts |
| 21 | Mary Mcgowan | 33 | Daughter | Waitress | Massachusetts |
| 22 | Catherine Downey | 28 | Daughter | — | Massachusetts |
| 23 | Edmund Downey | 32 | Son-in-law | Laborer | Massachusetts |
| 24 | Maureen Downey | 1 | Granddaughter | — | Massachusetts |
| 25 | John P. Mchugh | 39 | Head | Electrician | Massachusetts |
| 26 | Margaret E. Mchugh | 35 | Wife | — | Massachusetts |
| 27 | John Mchugh | 11 | Son | — | Massachusetts |
| 28 | Robert Mchugh | 10 | Son | — | Massachusetts |
| 29 | Elizabeth Mchugh | 7 | Daughter | — | Massachusetts |
| 30 | Margaret Mchugh | 4 | Daughter | — | Massachusetts |
| 31 | George C. Trotter | 31 | Head | Leather Worker | Massachusetts |
| 32 | Anna Trotter | 28 | Wife | — | Massachusetts |
| 33 | Virginia Trotter | 6 | Daughter | — | Massachusetts |
| 34 | George Jr. Trotter | 3 | Son | — | Massachusetts |
| 35 | William Bond | 58 | Head | Gardener | Massachusetts |
| 36 | Elizabeth Bond | 54 | Wife | — | Massachusetts |
| 37 | Mary Bond | 24 | Daughter | Laundress | Massachusetts |
| 38 | Herbert Bond | 22 | Son | Laborer | Massachusetts |
| 39 | Ruth Bond | 17 | Daughter | — | Massachusetts |
| 40 | Daniel Hayes | 25 | Head | Janitor | 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)