MC
Mary Coffey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this Mary Coffey across the 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1917), then head of a 7-person household.
Age 23
b. ~1917
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Coffey |
| Given Name | Mary E. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lawrence City |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Occupation | Rubber Worker |
| Industry | Rubber Company |
| Class of Worker | PW |
| Hours Worked | 2 |
| Income (1939) | 650 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Rubber Worker |
| Township / Ward | Lawrence City |
| Est. Birth Year | ~1917 |
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 |
|---|---|---|---|---|
| Phillip Coffey | Son | — | 25 | ~1915 |
| Mary Coffey | Spouse | — | 63 | ~1877 |
| Dennis Coffey | Son | — | 33 | ~1907 |
| Cornelius Coffey | Head | — | 58 | ~1882 |
| Julia Coffey | Daughter | — | 18 | ~1922 |
| Mary Coffey | Daughter | — | 23 | ~1917 |
| Katherine Coffey | Daughter | — | 20 | ~1920 |
Census Appearances
1930
Essex, Massachusetts
Daughter, age 13
Essex, Massachusetts · implied b. ~1917 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Coffey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | England |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Essex-County, Massachusetts
Daughter, age 23
Essex-County, Massachusetts · implied b. ~1917 — 7 household members
| Surname | Coffey |
| Given Name | Mary E. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lawrence City |
| 1935 Residence (County) | Essex |
| Occupation | Rubber Worker |
| Industry | Rubber Company |
| Class of Worker | PW |
| Hours Worked | 2 |
| Income (1939) | 650 |
| Highest Grade | Hs 4 |
| 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 Coffey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Coffey
Daughter · 1940 · age 23 · b. ~1917 · Massachusetts
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Sibling
Julia Coffey
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dennis Coffey
Sibling · 1940 · age 33
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Katherine Coffey
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Phillip Coffey
Sibling · 1940 · age 25
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 — 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-t0627-01584-00417)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Helen Gilchrist | 32 | wife | — | Massachusetts |
| 42 | Ronald Gilchrist | 0 | son | — | Massachusetts |
| 43 | John W. Gaudette | 27 | head | Chemist | Canada |
| 44 | Irene M. Gaudette | 22 | wife | — | Massachusetts |
| 45 | John J. Gaudette | 3 | son | — | Massachusetts |
| 46 | Alice M. Gaudette | 1 | daughter | — | Massachusetts |
| 47 | John Mercier | 25 | head | Doffer | Canada |
| 48 | Ida O. Mercier | 25 | wife | Cobb Winder | Massachusetts |
| 49 | Robert Mercier | 3 | son | — | Massachusetts |
| 50 | John J. Shulski | 27 | head | Weaver | Massachusetts |
| 51 | Mary Shulski | 23 | wife | — | Massachusetts |
| 52 | Born April 1 Shulski | 0 | son | — | Mass. |
| 53 | Helen Milne | 38 | head | Burler | Massachusetts |
| 54 | William Pearson | 30 | head | Roller Covering | Massachusetts |
| 55 | Alexia O. Pearson | 31 | wife | French Drawing | Massachusetts |
| 56 | William Pearson | 7 | son | — | Massachusetts |
| 57 | Ronald Pearson | 3 | son | — | Massachusetts |
| 58 | Mortimer Donohue | 31 | head | Bartender | Massachusetts |
| 59 | Dorothy G. Donohue | 28 | wife | — | Massachusetts |
| 60 | Donald Donohue | 7 | son | — | Massachusetts |
| 61 | Mortimer Donohue | 4 | son | — | Massachusetts |
| 62 | Charles W. Catt | 24 | head | Carding Room | Massachusetts |
| 63 | Thomas Catt | 24 | brother | Comber | Massachusetts |
| 64 | Walter Stewart | 27 | head | Baker | Scotland |
| 65 | Ruth R. Stewart | 24 | wife | French Drawing | Massachusetts |
| 66 | Richard Stewart | 2 | son | — | Massachusetts |
| 67 | John J. Wyman | 66 | head | — | Canada |
| 68 | Hazel Wyman | 44 | daughter-in-law | — | Massachusetts |
| 69 | Ruth Wyman | 5 | granddaughter | — | Massachusetts |
| 70 | Mark W. Wyman | 44 | son | Production Manager | Massachusetts |
| 71 | End Of Block 617 | None | — | — | — |
| 72 | Cornelius Coffey | 58 | head | Stationary Fireman | England |
| 73 | Mary O. Coffey | 63 | wife | — | Ireland |
| 74 | Dennis Coffey | 33 | son | Stationary Fireman | Massachusetts |
| 75 | Phillip J. Coffey | 25 | son | Comber | Massachusetts |
| 76 | Mary E. Coffey THIS PERSON | 23 | daughter | Rubber Worker | Massachusetts |
| 77 | Katherine Coffey | 20 | daughter | — | Massachusetts |
| 78 | Julia Coffey | 18 | daughter | — | Massachusetts |
| 79 | Artemise Marquis | 59 | head | — | Canada |
| 80 | Alice Marquis | 35 | daughter | Mender | 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)