MH
Mary Healey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Healey across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1924), then head of a 7-person household.
Age 16
b. ~1924
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Healey |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Medford City |
| Est. Birth Year | ~1924 |
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 |
|---|---|---|---|---|
| John Healey | Head | — | 45 | ~1895 |
| Mary Healey | Daughter | — | 16 | ~1924 |
| William Healey | Son | — | 9 | ~1931 |
| John Healey | Son | — | 12 | ~1928 |
| Nora Healey | Spouse | — | 45 | ~1895 |
| Constance Healey | Daughter | — | 14 | ~1926 |
| Richard Healey | Son | — | 5 | ~1935 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 7
Middlesex, Massachusetts · implied b. ~1923 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Healey |
| Given Name | Mary M |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 16
Middlesex-County, Massachusetts · implied b. ~1924 — 7 household members
| Surname | Healey |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Class of Worker | 0 |
| Highest Grade | H-2 |
| 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 Healey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Healey
Daughter · 1940 · age 16 · b. ~1924 · Massachusetts
★ You are viewing this record
Sibling
John Healey
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Healey
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Constance Healey
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Healey
Sibling · 1940 · age 9
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
40 people indexed on this census page (nara:1940:m-t0627-01612-00761)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Bertha J. Anderson | 57 | Wife | Clerk | Massachusetts |
| 2 | Henry G. Jr. Anderson | 11 | Son | — | Massachusetts |
| 3 | William E. Anderson | 9 | Son | — | Massachusetts |
| 4 | Lois Anderson | 8 | Daughter | — | Massachusetts |
| 5 | Karl H. Perkins | 50 | Head | Foreman | Massachusetts |
| 6 | Florence C. Perkins | 49 | Wife | — | Massachusetts |
| 7 | Arthur E. Perkins | 24 | Son | Shipper | Massachusetts |
| 8 | Paul H. Perkins | 22 | Son | Loader | Massachusetts |
| 9 | Doris E. Perkins | 18 | Daughter | Stenographer | Massachusetts |
| 10 | Marjorie A. Perkins | 14 | Daughter | — | Massachusetts |
| 11 | Florence L. Perkins | 12 | Daughter | — | Massachusetts |
| 12 | Priscilla M. Perkins | 3 | Daughter | — | Massachusetts |
| 13 | Alice M. Haas | 51 | Sister | Stationary | Massachusetts |
| 14 | John H. Healey | 45 | Head | Garden | Massachusetts |
| 15 | Nora A. Healey | 45 | Wife | Domestic | Eire |
| 16 | Mary M. Healey THIS PERSON | 16 | Daughter | — | Massachusetts |
| 17 | Constance T. Healey | 14 | Daughter | — | Massachusetts |
| 18 | John J. Healey | 12 | Son | — | Massachusetts |
| 19 | William D. Healey | 9 | Son | — | Massachusetts |
| 20 | Richard Healey | 5 | Son | — | Massachusetts |
| 21 | Margaret B. Sinclair | 46 | Head | Librarian | Maine |
| 22 | Marion Sinclair | 44 | Sister | Stenographer | Massachusetts |
| 23 | Marion J. Magown | 50 | Head | Registered Nurse | Massachusetts |
| 24 | Herbert B. Magown | 20 | Son | — | Massachusetts |
| 25 | Dorothy J. Magown | 13 | Daughter | — | Massachusetts |
| 26 | Everett F. Upton | 71 | Head | — | New Hampshire |
| 27 | Voris, Roger M. Upton | 70 | Son in law | Portrait Artist | England |
| 28 | Frances P. Upton | 36 | Wife | — | Canada |
| 29 | Phoebe M. Upton | 9 | Daughter | — | Massachusetts |
| 30 | Worthin R. Arthur | 33 | Head | Printing Pressman | Massachusetts |
| 31 | Helen M. Arthur | 30 | Wife | Book-Keeper | Massachusetts |
| 32 | Ann L. Arthur | 8 | Daughter | — | Massachusetts |
| 33 | Richard L. Arthur | 10 | Son | — | Massachusetts |
| 34 | Robert E. Arthur | 5 | Son | — | Massachusetts |
| 35 | George L. Arthur | 28 | Brother | Saxophonist | Massachusetts |
| 36 | John J. Holland | 52 | Head | Sanitary Laborer | Eire |
| 37 | Mary Holland | 44 | Wife | Domestic | Eire |
| 38 | Mary P. Holland | 20 | Daughter | Bread Wrapper | Massachusetts |
| 39 | Catherine Holland | 18 | Daughter | — | Massachusetts |
| 40 | Gertrude B. Holland | 15 | Daughter | — | Massachusetts |
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)