MC
Mary Cahill — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Franklin-County, Massachusetts
Our Model Tree links this Mary Cahill across the 1930 and 1940 US Censuses in Franklin-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 7-person household.
Age 12
b. ~1928
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Franklin-County, Massachusetts |
| Surname | Cahill |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Greenfield |
| 1935 Residence (County) | Franklin |
| Additional Details | |
| Highest Grade | 6 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Greenfield |
| Est. Birth Year | ~1928 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Claire Cahill | Daughter | — | 17 | ~1923 |
| Thomas Cahill | Son | — | 5 | ~1935 |
| Frederick Cahill | Head | — | 46 | ~1894 |
| Mary Cahill | Daughter | — | 12 | ~1928 |
| John Cahill | Son | — | 14 | ~1926 |
| Mary Cahill | Spouse | — | 43 | ~1897 |
| James Cahill | Son | — | 18 | ~1922 |
Census Appearances
1930
Franklin, Massachusetts
Daughter, age 1
Franklin, Massachusetts · implied b. ~1929 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | Mary P. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Franklin-County, Massachusetts
Daughter, age 12
Franklin-County, Massachusetts · implied b. ~1928 — 7 household members
| Surname | Cahill |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Greenfield |
| 1935 Residence (County) | Franklin |
| Highest Grade | 6 |
| 1935 Residence | Same place |
| 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 Mary Cahill across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Cahill
Daughter · 1940 · age 12 · b. ~1928 · Massachusetts
★ You are viewing this record
Sibling
Claire Cahill
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Cahill
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Cahill
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Cahill
Sibling · 1940 · age 14
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 — Franklin-County, Massachusetts
Open full size
1940 US Federal Census — Franklin-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01592-00029)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frederick J. Cahill | 46 | Head | Clerk | Massachusetts |
| 2 | Mary Cahill | 43 | Wife | — | Massachusetts |
| 3 | James Cahill | 18 | Son | Clerk | Massachusetts |
| 4 | Claire Cahill | 17 | Daughter | — | Massachusetts |
| 5 | John Cahill | 14 | Son | — | Massachusetts |
| 6 | Mary Cahill THIS PERSON | 12 | Daughter | — | Massachusetts |
| 7 | Thomas Cahill | 5 | Son | — | Massachusetts |
| 8 | Chester A. Baker | 26 | Head | — | Massachusetts |
| 9 | Helene Baker | 23 | Wife | Recreation Instructor | Massachusetts |
| 10 | Richard Baker | 1 | Son | — | Massachusetts |
| 11 | Grace Morell | 72 | Head | — | New Hampshire |
| 12 | Albert Morell | 28 | Son | Finisher | Massachusetts |
| 13 | Eleanor Morell | 30 | Daughter-in-law | Sorter | Massachusetts |
| 14 | Wallace C. Bailey | 49 | Head | Inspector | Vermont |
| 15 | Zilpha Bailey | 49 | Wife | — | Vermont |
| 16 | Carolyn Bailey | 19 | Daughter | Dentist'S Assistant | Vermont |
| 17 | Harold Moore | 38 | Head | Machinist | Vermont |
| 18 | Mary Moore | 37 | Wife | — | Vermont |
| 19 | Frances Moore | 11 | Son | — | Massachusetts |
| 20 | Richard Moore | 8 | Son | — | Massachusetts |
| 21 | Frederick Girard | 59 | Head | Brakeman | Vermont |
| 22 | Anastasia Girard | 58 | Wife | — | Vermont |
| 23 | Mary L. Girard | 31 | Daughter | Teacher | Vermont |
| 24 | Helen P. Girard | 20 | Daughter | Playground Instructor | Massachusetts |
| 25 | Michael Stewart | 68 | Head | — | Ireland |
| 26 | Nance G. Stewart | 62 | Wife | — | Vermont |
| 27 | Agnes Rawlin | 36 | Housekeeper | Housekeeper | Vermont |
| 28 | Florence Graves | 63 | Head | Inspector | Massachusetts |
| 29 | Florence Graves | 53 | Wife | — | Vermont |
| 30 | Jennie Frink | 48 | Housekeeper | Housekeeper | Vermont |
| 31 | Harry M. Grave | 30 | Head | Laborer | Massachusetts |
| 32 | Jennie M. Grave | 25 | Wife | — | Vermont |
| 33 | Ronald A. Grave | 6 | Son | — | Massachusetts |
| 34 | William Rosemeisle | 30 | Head | Fireman | Massachusetts |
| 35 | Christine Rosemeisle | 24 | Wife | — | Massachusetts |
| 36 | Dona Lee Rosemeisle | 5 | Daughter | — | Massachusetts |
| 37 | Furber W. Dimond | 50 | Head | Janitor | New Hampshire |
| 38 | Helen Dimond | 42 | Wife | — | Massachusetts |
| 39 | Eleanor Dimond | 19 | Daughter | Waitress | New Hampshire |
| 40 | Mildred Dimond | 18 | Daughter | Housemaid | New Hampshire |
Related Census Records
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)