MC
Mary Cahill — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this Mary Cahill across the 1920, 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1866), then head of a 6-person household.
Age 74
b. ~1866
Female
Head
Born: Ireland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Cahill |
| Given Name | Mary J. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 74 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Saugus |
| 1935 Residence (County) | Essex |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | 8 |
| 1935 Residence | Same house |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Saugus |
| Est. Birth Year | ~1866 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Arthur Cahill | Son | — | 38 | ~1902 |
| Mary Cahill | Head | — | 74 | ~1866 |
| Leo Cahill | Son | — | 32 | ~1908 |
| Thomas Cahill | Son | — | 40 | ~1900 |
| John Cahill | Son | — | 46 | ~1894 |
| Mary Cahill | Daughter | — | 45 | ~1895 |
Census Appearances
1920
Middlesex, Massachusetts
Other, age 57
Middlesex, Massachusetts · implied b. ~1863 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | Mary A |
| Relationship to Head | mother-in-law |
| Sex | F |
| Color / Race | White |
| Age | 57 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Year of Immigration | 1885 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Year of Naturalization | 1892 |
| Birthplace (normalized) | ireland |
1930
Middlesex, Massachusetts
Other, age 65
Middlesex, Massachusetts · implied b. ~1865 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | Margaret |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1886 |
| Age at First Marriage | 21 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Essex-County, Massachusetts
Head, age 74
Essex-County, Massachusetts · implied b. ~1866 — 6 household members
| Surname | Cahill |
| Given Name | Mary J. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 74 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Saugus |
| 1935 Residence (County) | Essex |
| Naturalization Status | Naturalized |
| Highest Grade | 8 |
| 1935 Residence | Same house |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 74 · b. ~1866 · 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 — 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-t0627-01590-00274)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles W. Weld | 69 | Head | Mechanic | Massachusetts |
| 2 | Sarah Weld | 72 | Wife | — | Canada-Eng. |
| 3 | Richard A. Stromberg | 67 | Head | Machinist | Sweden |
| 4 | John E. Stromberg | 17 | Son | — | Massachusetts |
| 5 | Mary J. Cahill THIS PERSON | 74 | Head | — | Ireland |
| 6 | John J. Cahill | 46 | Son | Settle Hand | Massachusetts |
| 7 | Mary J. Cahill | 45 | Daughter | Winder | Massachusetts |
| 8 | Thomas F. Cahill | 40 | Son | Milk | Massachusetts |
| 9 | Arthur P. Cahill | 38 | Son | Master Mech. | Massachusetts |
| 10 | Leo Cahill | 32 | Son | Fireman | Massachusetts |
| 11 | August P. Eiskin | 81 | Head | — | Sweden |
| 12 | Ida C. Eiskin | 72 | Wife | — | Sweden |
| 13 | Carl H. Eiskin | 35 | Son | Retail Clerk | Massachusetts |
| 14 | Gladys M. Eiskin | 32 | Daughter in law | — | Massachusetts |
| 15 | Carol J. Eiskin | 6 | Neice | — | Massachusetts |
| 16 | Joseph A. Lambert | 65 | Head | — | New Hampshire |
| 17 | Annie M. Lambert | 60 | Wife | — | Canada-Eng. |
| 18 | Irene G. Lambert | 29 | Daughter | Clerk | Massachusetts |
| 19 | Johanna M. Lambert | 2 | Neice | — | Massachusetts |
| 20 | Charles T. Anderson | 69 | Head | Die-Maker | Sweden |
| 21 | Elizabeth H. Anderson | 66 | Wife | — | Sweden |
| 22 | Josephine Christmas | 19 | Lodger | New Worker | New York |
| 23 | William Mckenney | 56 | Head | Attendant | Massachusetts |
| 24 | Ida E. Mckenney | 54 | Wife | — | England |
| 25 | Ruth E. Mckenney | 21 | Daughter | Instrument Worker | Massachusetts |
| 26 | Edward F. Gallant | 39 | Head | Cabinet Maker | Massachusetts |
| 27 | Elizabeth M. Gallant | 35 | Wife | — | Massachusetts |
| 28 | Edward F. Gallant | 13 | Son | — | Massachusetts |
| 29 | Elizabeth J. Gallant | 10 | Daughter | — | Massachusetts |
| 30 | Ronald Gallant | 5 | Son | — | Massachusetts |
| 31 | Tillie J. Scott | 58 | Head | — | Poland |
| 32 | James E. O'Leary | 38 | Head | Toolmaker | Massachusetts |
| 33 | James E. Jr. O'Leary | 13 | Son | — | Massachusetts |
| 34 | Theresa O'Leary | 9 | Daughter | — | Massachusetts |
| 35 | Gertrude O'Leary | 10 | Daughter | — | Massachusetts |
| 36 | Timothy E. Twomey | 43 | Lodger | Assembler | Massachusetts |
| 37 | Violet E. Twomey | 43 | Lodger | — | Massachusetts |
| 38 | Timothy J. Twomey | 11 | Lodger | — | Massachusetts |
| 39 | Andrew G. Bloom | 66 | Head | Machinist | Sweden |
| 40 | Augusta M. Bloom | 62 | Wife | — | Sweden |
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)