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Mary Mcdonnell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this Mary Mcdonnell across the 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1901), then head of a 6-person household.
Age 39
b. ~1901
Female
Spouse
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | McDonnell |
| Given Name | Mary K. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lawrence City |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Hours Worked | 15 |
| Highest Grade | C 5 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Lawrence City |
| Est. Birth Year | ~1901 |
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 |
|---|---|---|---|---|
| Joan Mcdonnell | Daughter | — | 1 | ~1939 |
| Marie Mcdonnell | Daughter | — | 13 | ~1927 |
| James Mcdonnell | Son | — | 10 | ~1930 |
| Ellen Driscoll | Other | — | 79 | ~1861 |
| Mary Mcdonnell | Spouse | — | 39 | ~1901 |
| Joseph Mcdonnell | Head | — | 50 | ~1890 |
Census Appearances
1930
Essex, Massachusetts
Daughter, age 29
Essex, Massachusetts · implied b. ~1901 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Assembler |
| Industry | Elec. appl. factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Essex-County, Massachusetts
Spouse, age 39
Essex-County, Massachusetts · implied b. ~1901 — 6 household members
| Surname | McDonnell |
| Given Name | Mary K. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lawrence City |
| 1935 Residence (County) | Essex |
| Hours Worked | 15 |
| Highest Grade | C 5 |
| 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 Mary Mcdonnell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Mcdonnell
Spouse · 1940 · age 39 · b. ~1901 · 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
36 people indexed on this census page (nara:1940:m-t0627-01584-00060)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John Mcmahon | 66 | Head | — | Eire |
| 42 | Katherine Mcmahon | 36 | Daughter | School Teacher | Massachusetts |
| 43 | Marguerite Mcmahon | 32 | Daughter | School Teacher | Massachusetts |
| 44 | Claire Mcmahon | 17 | Daughter | — | Massachusetts |
| 46 | Daniel Hart | 39 | Head | Police | Massachusetts |
| 47 | Katherine Hart | 38 | Wife | Mender | Massachusetts |
| 48 | Claire Ann Hart | 13 | Daughter | — | Massachusetts |
| 49 | Mary Virginia Hart | 11 | Daughter | — | Massachusetts |
| 51 | Real Lavoie | 75 | Head | — | Canada-French |
| 52 | Delina Lavoie | 69 | Wife | — | Canada-French |
| 53 | Raymond Lavoie | 28 | Son | Clerk | Massachusetts |
| 54 | Lena Lavoie | 25 | Daughter | Maker | Massachusetts |
| 55 | John J. Roberts | 41 | Head | Dyer | Massachusetts |
| 56 | Mary Roberts | 42 | Wife | Mender | Massachusetts |
| 57 | Gerard Roberts | 18 | Son | Laborer | Massachusetts |
| 58 | Nellie Collins | 63 | Head | Police Matron | Eire |
| 59 | Mildred | Margaret Collins | 33 | Daughter | Mender | Massachusetts |
| 60 | Edward G. Leach | 56 | Head | Woolsorter | Massachusetts |
| 61 | Bertha Mcclelland | 41 | Lodger | Drawer | Massachusetts |
| 62 | Dorothy Mcclelland | 19 | Lodger | Domestic | Massachusetts |
| 63 | Georgina Robert | 74 | Lodger | — | Canada-French |
| 64 | Claire Mcclelland | 13 | Lodger | — | Massachusetts |
| 65 | Joseph Mcdonnell | 50 | Head | Machinist | Massachusetts |
| 66 | Mary K. Mcdonnell THIS PERSON | 39 | Wife | — | Massachusetts |
| 67 | Marie Mcdonnell | 13 | Daughter | — | Massachusetts |
| 68 | James Mcdonnell | 10 | Son | — | Massachusetts |
| 69 | Joan Mcdonnell | 1 | Daughter | — | Massachusetts |
| 70 | Ellen Driscoll | 79 | Mother-in-law | — | Eire |
| 71 | J. George Powers | 27 | Head | Laborer | Massachusetts |
| 72 | Grace Powers | 27 | Wife | Doffer | Massachusetts |
| 73 | Ruth Powers | 2 | Daughter | — | Massachusetts |
| 74 | Beatrice A. White | 36 | Wife | Winder | Massachusetts |
| 75 | Clifford Waite | 33 | Head | Doffer | England |
| 78 | Mary Decourcey | 55 | Head | — | Belgium |
| 79 | Margaret M. Decourcey | 25 | Daughter | Operative | Massachusetts |
| 80 | Marcelle Decourcey | 21 | Son | Operative | 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)