MC
Mary Cahill — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Norfolk-County, Massachusetts
Our Model Tree links this Mary Cahill across the 1920, 1930 and 1940 US Censuses in Norfolk-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1864), then head of a 7-person household.
Age 76
b. ~1864
Female
Head
Born: Massachusetts
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Norfolk-County, Massachusetts |
| Surname | Cahill |
| Given Name | Mary A. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 76 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Town of Braintree |
| 1935 Residence (County) | Norfolk |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Town Of Braintree |
| Est. Birth Year | ~1864 |
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 |
|---|---|---|---|---|
| Janet Pergamo | Other | — | 5 | ~1935 |
| Barbara Pergamo | Other | — | 10 | ~1930 |
| Charles Pergamo | Son | — | 33 | ~1907 |
| Charles Pergamo | Other | — | 13 | ~1927 |
| Mary Cahill | Head | — | 76 | ~1864 |
| Catherine Pergamo | Daughter | — | 31 | ~1909 |
| Joan Pergamo | Other | — | 11 | ~1929 |
Census Appearances
1920
Norfolk, Massachusetts
Head, age 53
Norfolk, Massachusetts · implied b. ~1867 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Nurse |
| Industry | Private Family |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Norfolk, Massachusetts
Head, age 63
Norfolk, Massachusetts · implied b. ~1867
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Cahill |
| Given Name | Mary A. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 63 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| Age at First Marriage | 20 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Nurse |
| Industry | Practical Nurse |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 4500 |
| Radio Set | R |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Norfolk-County, Massachusetts
Head, age 76
Norfolk-County, Massachusetts · implied b. ~1864 — 7 household members
| Surname | Cahill |
| Given Name | Mary A. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 76 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Town of Braintree |
| 1935 Residence (County) | Norfolk |
| Class of Worker | 0 |
| Highest Grade | H-4 |
| 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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Cahill
Head · 1940 · age 76 · b. ~1864 · 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 — Norfolk-County, Massachusetts
Open full size
1940 US Federal Census — Norfolk-County, Massachusetts
Page Contents
15 people indexed on this census page (nara:1940:m-t0627-01624-00264)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Marguerite M. Mccue | 49 | Wife | — | Massachusetts |
| 42 | Robert J. Mccue | 18 | Son | — | Massachusetts |
| 43 | Dorothy E. Mccue | 14 | Daughter | — | Massachusetts |
| 44 | Elizabeth Mccue | 12 | Daughter | — | Massachusetts |
| 45 | Mary J. Mccue | 9 | Daughter | — | Massachusetts |
| 46 | Mary A. Cahill THIS PERSON | 76 | Head | — | Massachusetts |
| 47 | Charles J. Pergamo | 33 | Son | Salesman | Massachusetts |
| 48 | Catherine Pergamo | 31 | Daughter | — | Massachusetts |
| 49 | Charles W. Pergamo | 13 | Grandson | — | Massachusetts |
| 50 | Joan L. Pergamo | 11 | Granddaughter | — | Massachusetts |
| 51 | Barbara Pergamo | 10 | Granddaughter | — | Massachusetts |
| 52 | Janet Pergamo | 5 | Granddaughter | — | Massachusetts |
| 53 | Carl F. Johnson | 47 | Head | Carpenter | Massachusetts |
| 54 | Lillian S. Johnson | 44 | Wife | — | Massachusetts |
| 55 | Barbara E. Johnson | 18 | Daughter | Stenographer | 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)