MC
Mary Coffey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Coffey across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 9-person household.
Age 10
b. ~1930
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Coffey |
| Given Name | Mary C |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Concord |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | G 4 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Concord |
| Est. Birth Year | ~1930 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Joseph Coffey | Son | — | 12 | ~1928 |
| Albert Coffey | Son | — | 14 | ~1926 |
| Albert Coffey | Head | — | 40 | ~1900 |
| Mary Coffey | Daughter | — | 10 | ~1930 |
| Ellen Coffey | Daughter | — | 5 | ~1935 |
| Margaret Coffey | Daughter | — | 8 | ~1932 |
| John Coffey | Son | — | 13 | ~1927 |
| Elizabeth Coffey | Spouse | — | 39 | ~1901 |
| David Coffey | Son | — | 1 | ~1939 |
Census Appearances
1930
Middlesex, Massachusetts
Other, age
Middlesex, Massachusetts · implied b. ~1930 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Coffey |
| Given Name | Mary F. |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Canada-English |
| Mother's Birthplace | Canada-English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 10
Middlesex-County, Massachusetts · implied b. ~1930 — 9 household members
| Surname | Coffey |
| Given Name | Mary C |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Concord |
| 1935 Residence (County) | Middlesex |
| Hours Worked | 0 |
| Highest Grade | G 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.
Show:
This person
Anchor record
Mary Coffey
Daughter · 1940 · age 10 · b. ~1930 · Massachusetts
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Sibling
Margaret Coffey
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ellen Coffey
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Coffey
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Coffey
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Coffey
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Albert Coffey
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01603-01054)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John A Finegan | 65 | Head | — | Massachusetts |
| 2 | Martin J Finegan | 62 | Brother | — | Massachusetts |
| 3 | Mary Finegan | 58 | Sister | — | Massachusetts |
| 4 | Casper Jr Jenney | 39 | Head | Contractor | Massachusetts |
| 5 | Eleanor Jenney | 41 | Wife | — | Massachusetts |
| 6 | Edward Jr Kervin | 36 | Head | Police Officer | Massachusetts |
| 7 | Julia T Kervin | 35 | Wife | — | Massachusetts |
| 8 | Richard M Kervin | 9 | Son | — | Massachusetts |
| 9 | James E Kervin | 8 | Son | — | Massachusetts |
| 10 | John W Kervin | 6 | Son | — | Massachusetts |
| 11 | Constance M Kervin | 5 | Daughter | — | Massachusetts |
| 12 | Arthur J Duggan | 36 | Head | Credit Man | Massachusetts |
| 13 | Mary Duggan | 33 | Wife | — | Massachusetts |
| 14 | Arthur J Jr Duggan | 3 | Son | — | Massachusetts |
| 15 | Nancy Duggan | 0 | Daughter | — | Massachusetts |
| 16 | Charles F Marsh | 48 | Head | — | Massachusetts |
| 17 | Thera Marsh | 45 | Wife | — | Massachusetts |
| 18 | Edna Keith | 46 | Lodger | Bookkeeper | New York |
| 19 | Raymond Sims | 49 | Head | Merchant | Massachusetts |
| 20 | Gertrude Sims | 43 | Wife | — | Massachusetts |
| 21 | Raymond Jr Sims | 15 | Son | — | Massachusetts |
| 22 | Virginia Sims | 11 | Daughter | — | Massachusetts |
| 23 | Albert M Coffey | 40 | Head | Plumber & Steamfitter | Massachusetts |
| 24 | Elizabeth L Coffey | 39 | Wife | — | Massachusetts |
| 25 | Albert M Jr Coffey | 14 | Son | — | Massachusetts |
| 26 | John B Coffey | 13 | Son | — | Massachusetts |
| 27 | Joseph L Coffey | 12 | Son | — | Massachusetts |
| 28 | Mary C Coffey THIS PERSON | 10 | Daughter | — | Massachusetts |
| 29 | Margaret F Coffey | 8 | Daughter | — | Massachusetts |
| 30 | Ellen Coffey | 5 | Daughter | — | Massachusetts |
| 31 | David Coffey | 1 | Son | — | Massachusetts |
| 32 | Esther Macdonald | 55 | Head | — | Canada |
| 33 | Julia Fay | 29 | Niece | Secretary | Massachusetts |
| 34 | Alexander Macleod | 61 | Head | Electrical Contractor | Canada |
| 35 | Mary I Macleod | 54 | Wife | — | Massachusetts |
| 36 | Alexander Jr Macleod | 23 | Son | Electrician | Massachusetts |
| 37 | Evelena Cross | 71 | Head | — | Massachusetts |
| 38 | Charles H Miner | 83 | Head | — | Massachusetts |
| 39 | Jane A M Miner | 75 | Wife | — | Canada |
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)