MC
Mary Callahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hillsborough-County, New Hampshire
Our Model Tree links this Mary Callahan across the 1930 and 1940 US Censuses in Hillsborough-County, New Hampshire (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 11-person household.
Age 19
b. ~1921
Female
Daughter
Born: New Hampshire
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hillsborough-County, New Hampshire |
| Surname | Callahan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Manchester |
| 1935 Residence (County) | Hillsborough |
| Additional Details | |
| Industry | 0 |
| Class of Worker | No |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
| Township / Ward | Manchester |
| Est. Birth Year | ~1921 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Hazel Callahan | Daughter | — | 18 | ~1922 |
| Mary Callahan | Daughter | — | 19 | ~1921 |
| Janice Callahan | Daughter | — | 3 | ~1937 |
| Helen Callahan | Daughter | — | 10 | ~1930 |
| Denis Callahan | Head | — | 48 | ~1892 |
| Clarence Callahan | Son | — | 6 | ~1934 |
| Walter Callahan | Son | — | 14 | ~1926 |
| Robert Callahan | Son | — | 12 | ~1928 |
| Gerald Callahan | Son | — | 22 | ~1918 |
| William Callahan | Son | — | 16 | ~1924 |
| Agnes Callahan | Spouse | — | 46 | ~1894 |
Census Appearances
1930
Hillsboro, New …
Other, age 9
Hillsboro, New Hampshire · implied b. ~1921 — 27 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | Mary |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| Father's Birthplace | New Hampshire |
| Mother's Birthplace | New Hampshire |
| Can Read/Write | Yes |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1940
Hillsborough-County, New …
Daughter, age 19
Hillsborough-County, New Hampshire · implied b. ~1921 — 11 household members
| Surname | Callahan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Manchester |
| 1935 Residence (County) | Hillsborough |
| Industry | 0 |
| Class of Worker | No |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
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 Mary Callahan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Callahan
Daughter · 1940 · age 19 · b. ~1921 · New Hampshire
★ You are viewing this record
Sibling
Walter Callahan
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hazel Callahan
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Callahan
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Callahan
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clarence Callahan
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Janice Callahan
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Callahan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gerald 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 — Hillsborough-County, New Hampshire
Open full size
1940 US Federal Census — Hillsborough-County, New Hampshire
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02292-00426)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edward Davis | 14 | Son | — | New Hampshire |
| 42 | Helen Davis | 10 | Daughter | — | New Hampshire |
| 43 | Annie Moquin | 70 | Head | — | New Hampshire |
| 44 | William Mason | 55 | Boarder | Laborer | Massachusetts |
| 45 | Gideon Gagnon | 56 | Head | Stone Mason | New Hampshire |
| 46 | Mary Gagnon | 57 | Wife | — | New Hampshire |
| 47 | William Costello | 40 | Head | — | Massachusetts |
| 48 | Rosana Costello | 46 | Wife | — | Canada-French |
| 49 | Rosana Costello | 8 | Daughter | — | New Hampshire |
| 50 | William G. Costello | 6 | Son | — | New Hampshire |
| 51 | Louise Costello | 5 | Daughter | — | New Hampshire |
| 52 | Napoleon Filteau | 43 | Head | Carpenter | Canada-French |
| 53 | Marie Filteau | 40 | Wife | — | Canada-French |
| 54 | Edward Filteau | 16 | Son | — | New Hampshire |
| 55 | Rita Filteau | 11 | Daughter | — | New Hampshire |
| 56 | Alice Blanchard | 55 | Head | — | Canada-French |
| 57 | Lionel Blanchard | 22 | Son | Clerk | New Hampshire |
| 58 | Lucien Blanchard | 20 | Son | Laborer | New Hampshire |
| 59 | Noel Blanchard | 18 | Son | Laborer | New Hampshire |
| 60 | Eugenie Trudel | 52 | Head | Seamstress | New Hampshire |
| 61 | Denis P. Callahan | 48 | Head | — | New Hampshire |
| 62 | Agnes Callahan | 46 | Wife | Seamstress | New Hampshire |
| 63 | Gerald Callahan | 22 | Son | Laborer | New Hampshire |
| 64 | Mary Callahan THIS PERSON | 19 | Daughter | — | New Hampshire |
| 65 | Hazel Callahan | 18 | Daughter | — | New Hampshire |
| 66 | William Callahan | 16 | Son | — | New Hampshire |
| 67 | Walter Callahan | 14 | Son | — | New Hampshire |
| 68 | Robert Callahan | 12 | Son | — | New Hampshire |
| 69 | Helen Callahan | 10 | Daughter | — | New Hampshire |
| 70 | Clarence Callahan | 6 | Son | — | New Hampshire |
| 71 | Janice Callahan | 3 | Daughter | — | New Hampshire |
| 72 | Philipp Labbe | 55 | Head | Carpenter | Canada-French |
| 73 | Mary Labbe | 53 | Wife | — | Canada-French |
| 74 | Laura Labbe | 20 | Daughter | Shoe Worker | New Hampshire |
| 75 | Thomas Cameron | 60 | Head | Loom Fixer | Canada-French |
| 76 | Adella Cameron | 54 | Wife | — | Canada-French |
| 77 | Omer Cameron | 45 | Son | Cleaner | New Hampshire |
| 78 | Edmond Dupuis | 57 | Head | Laborer | Canada-French |
| 79 | Lorenza Dupuis | 52 | Wife | — | Canada-French |
| 80 | Annita Dupuis | 20 | Daughter | Fancy Stitcher | Canada-French |
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)