MK
Mary Kelley — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Kelley across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents John & Mary — first a spouse (b.~1915), then head of a 4-person household.
Age 25
b. ~1915
Female
Spouse
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Kelley |
| Given Name | Mary R. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1915 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Rita Kelley | Daughter | — | 1 | ~1939 |
| William Kelley | Head | — | 26 | ~1914 |
| Margaret Doonan | Other | — | 65 | ~1875 |
| Mary Kelley | Spouse | — | 25 | ~1915 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 2
Middlesex, Massachusetts · implied b. ~1918 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Killey |
| Given Name | Mary R |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 13
Middlesex, Massachusetts · implied b. ~1917 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kelley |
| Given Name | Mary R. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 25
Middlesex-County, Massachusetts · implied b. ~1915 — 4 household members
| Surname | Kelley |
| Given Name | Mary R. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Highest Grade | H-4 |
| 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 Kelley across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Kelley (~0.92 confidence) and mother Mary Kelley (~0.92 confidence) and father Augustine Killey (~0.92 confidence) and mother Mary Killey (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Kelley
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Mary Kelley
b. ~1894
Source mother
● Household
· direct · ~0.92
Father
Augustine Killey
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Mary Killey
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Kelley
Spouse · 1940 · age 25 · b. ~1915 · Massachusetts
★ You are viewing this record
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-t0627-01703-00377)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Daniel Pantano | 38 | Head | Presser | Italy |
| 2 | Frances Pantano | 32 | Wife | — | Massachusetts |
| 3 | Gilda Pantano | 11 | Daughter | — | Massachusetts |
| 4 | Beatrice Pantano | 8 | Daughter | — | Massachusetts |
| 5 | Conetta Marchitelli | 52 | Mother in law | — | Italy |
| 6 | John P. Bennon | 40 | Head | Dress Maker | Irish Free State |
| 7 | Mary A. Bennon | 39 | Wife | Shipper | Irish Free State |
| 8 | John A. Bennon | 5 | Son | — | Massachusetts |
| 9 | Mary A. Bennon | 0 | Daughter | — | Massachusetts |
| 10 | William J. Egan | 37 | Head | Assistant Manager | Massachusetts |
| 11 | Anna F. Egan | 36 | Wife | — | Massachusetts |
| 12 | Virginia M. Egan | 14 | Daughter | — | Massachusetts |
| 13 | William Egan | 72 | Father | Rental Agent | Massachusetts |
| 14 | Frank J. Gaffery | 51 | Head | Hoisting Engineer | Massachusetts |
| 15 | Elizabeth C. Gaffery | 52 | Wife | — | Canada-English |
| 16 | Arthur Brennan | 36 | Son | Clerk | Massachusetts |
| 17 | Dorothy M. Brennan | 33 | Daughter | — | Massachusetts |
| 18 | Margaret Brennan | 85 | Mother in law | — | Canada-English |
| 19 | Cecil L. Pingree | 42 | Head | Bank Clerk | Massachusetts |
| 20 | Bernice M. Pingree | 40 | Wife | — | Massachusetts |
| 21 | Robert L. Pingree | 21 | Son | Attendant | Massachusetts |
| 22 | Walter J. Pingree | 14 | Son | — | Massachusetts |
| 23 | Arline M. Pingree | 3 | Daughter | — | Massachusetts |
| 24 | David Mahood | 44 | Head | Fireman | Massachusetts |
| 25 | Christina Mahood | 45 | Wife | — | Canada-English |
| 26 | Walter J. Quinn | 32 | Head | Salesman | Massachusetts |
| 27 | Isabelle Quinn | 31 | Wife | — | Massachusetts |
| 28 | Ann Quinn | 3 | Daughter | — | Massachusetts |
| 29 | Joan Quinn | 3 | Daughter | — | Massachusetts |
| 30 | Ellsworth Brazier | 38 | Head | Car Loader & Sorter | Maine |
| 31 | Ellen Brazier | 30 | Wife | — | South Carolina |
| 32 | Walter Brazier | 69 | Father | Platform Sorter | Maine |
| 33 | Fred H. Roche | 27 | Head | Chauffeur | Massachusetts |
| 34 | June H. Roche | 25 | Wife | — | Massachusetts |
| 35 | Robert Roche | 4 | Son | — | Massachusetts |
| 36 | William L. Kelley | 26 | Head | Finance Clerk | Massachusetts |
| 37 | Mary R. Kelley THIS PERSON | 25 | Wife | — | Massachusetts |
| 38 | Rita M. Kelley | 1 | Daughter | — | Massachusetts |
| 39 | Margaret E. Doonan | 65 | Mother in law | — | Irish Free State |
| 40 | Joseph A. Thomas | 37 | Head | Compositor | Massachusetts |
Pedigree Summary
Mary
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)