MK
Mary Kenny — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Kenny across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 6-person household.
Age 18
b. ~1922
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Kenny |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Industry | No |
| Highest Grade | No 9 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1922 |
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 |
|---|---|---|---|---|
| Kathleen O'Connor | Daughter | — | 12 | ~1928 |
| John O'Connor | Head | — | 42 | ~1898 |
| Angelina O'Connor | Daughter | — | 21 | ~1919 |
| Helen O'Connor | Daughter | — | 14 | ~1926 |
| Mary O'Connor | Spouse | — | 38 | ~1902 |
| Mary Kenny | Daughter | — | 18 | ~1922 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 8
Suffolk, Massachusetts · implied b. ~1922 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kenney |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | New Hampshire |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 18
Suffolk-County, Massachusetts · implied b. ~1922 — 6 household members
| Surname | Kenny |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Industry | No |
| Highest Grade | No 9 |
| 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 Kenny across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Kenny
Daughter · 1940 · age 18 · b. ~1922 · Massachusetts
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Sibling
Helen O'Connor
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Angelina O'Connor
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathleen O'Connor
Sibling · 1940 · age 12
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01659-00347)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ida M. Geswell | 49 | Sister | Restaurant | Massachusetts |
| 2 | Catherine F. Boyd | 18 | Lodger | New Worker | Massachusetts |
| 3 | William J. Mccauley | 44 | Head | Electrician | Massachusetts |
| 4 | Winifred L. Mccauley | 45 | Wife | — | Massachusetts |
| 5 | William J. Jr. Mccauley | 16 | Son | — | Massachusetts |
| 6 | Dorothy Mccauley | 5 | Daughter | — | Massachusetts |
| 7 | John F. Mcdonough | 41 | Head | Laborer | Massachusetts |
| 8 | Grace I. Mcdonough | 36 | Wife | — | Nova Scotia |
| 9 | Francis M. Mcdonough | 10 | Son | — | Massachusetts |
| 10 | Lawrence Mcdonough | 9 | Son | — | Massachusetts |
| 11 | William Mcdonough | 8 | Son | — | Massachusetts |
| 12 | Rubin Osofsky | 37 | Head | Music Teacher | Massachusetts |
| 13 | Elizabeth A. Osofsky | 31 | Wife | — | Massachusetts |
| 14 | Irene I. Osofsky | 14 | Daughter | — | Massachusetts |
| 15 | Gilbert H. Evans | 19 | Step-son | — | Massachusetts |
| 16 | Thomas P. Breslin | 53 | Head | Laborer | Northern Ireland |
| 17 | Frank H. Breslin | 52 | Brother | Express Agent | Massachusetts |
| 18 | Edward P. Tobin | 72 | Head | — | Canada-English |
| 19 | Ann M. Tobin | 65 | Wife | — | Nova Scotia |
| 20 | Patrick J. Joyce | 40 | Head | Freight Handler | Eire |
| 21 | Elizabeth L. Joyce | 35 | Wife | — | Eire |
| 22 | Mary Stearns | 55 | Head | Seamstress | Massachusetts |
| 23 | Richard Parker | 67 | Head | — | Eire |
| 24 | Catherine Parker | 68 | Wife | — | Eire |
| 25 | Anne J. Parker | 32 | Daughter | Factory Worker | Massachusetts |
| 26 | Mary M. Parker | 30 | Daughter | Factory Worker | Massachusetts |
| 27 | James Kerwin | 75 | Head | — | Eire |
| 28 | Mary C. Kerwin | 76 | Wife | — | Eire |
| 29 | Margaret Kerwin | 32 | Daughter | Seamstress | Massachusetts |
| 30 | Ellen Kerwin | 30 | Daughter | Filing Clerk | Massachusetts |
| 31 | Lawrence J. Kerwin | 28 | Son | Laborer | Massachusetts |
| 32 | Timothy J. O'Brien | 37 | Head | Shipfitters Helper | Massachusetts |
| 33 | Mary M. O'Brien | 33 | Wife | — | Massachusetts |
| 34 | Theresa M. O'Brien | 10 | Daughter | — | Massachusetts |
| 35 | John O'Connor | 42 | Head | Checker | Eire |
| 36 | Mary V. O'Connor | 38 | Wife | — | New Hampshire |
| 37 | Angelina A. O'Connor | 21 | Daughter | Bookbinder | New Hampshire |
| 38 | Helen J. O'Connor | 14 | Daughter | — | Massachusetts |
| 39 | Kathleen E. O'Connor | 12 | Daughter | — | Massachusetts |
| 40 | Mary Kenny THIS PERSON | 18 | Daughter | — | 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)