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Mary Mckinney — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Mckinney across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 9-person household.
Age 14
b. ~1926
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | McKinney |
| Given Name | Mary J. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | S 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1926 |
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 |
|---|---|---|---|---|
| Alice Mckinney | Daughter | — | 13 | ~1927 |
| Bernice Mckinney | Daughter | — | 8 | ~1932 |
| Evelyn Mckinney | Daughter | — | 16 | ~1924 |
| William Mckinney | Son | — | 7 | ~1933 |
| Sheila Mckinney | Daughter | — | 2 | ~1938 |
| Mary Mckinney | Daughter | — | 14 | ~1926 |
| Alice Mckinney | Spouse | — | 42 | ~1898 |
| Russell Mckinney | Son | — | 4 | ~1936 |
| William Mckinney | Head | — | 41 | ~1899 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 4
Middlesex, Massachusetts · implied b. ~1926 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McKenney |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Age at First Marriage | 4 |
| Father's Birthplace | Canada-English |
| Mother's Birthplace | Canada-English |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 14
Middlesex-County, Massachusetts · implied b. ~1926 — 9 household members
| Surname | McKinney |
| Given Name | Mary J. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Income (1939) | 0 |
| Highest Grade | S 8 |
| 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 Mckinney across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mckinney
Daughter · 1940 · age 14 · b. ~1926 · Massachusetts
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Sibling
Bernice Mckinney
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mckinney
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Evelyn Mckinney
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sheila Mckinney
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Russell Mckinney
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Mckinney
Sibling · 1940 · age 13
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-t0627-01702-00669)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | George E O'Loughlin | 13 | son | — | Massachusetts |
| 42 | Marian O'Loughlin | 12 | daughter | — | Massachusetts |
| 43 | Gertrude O'Loughlin | 10 | daughter | — | Massachusetts |
| 44 | Doris O'Loughlin | 9 | daughter | — | Massachusetts |
| 45 | Rita E. O'Loughlin | 7 | daughter | — | Massachusetts |
| 46 | Margaret J. O'Loughlin | 6 | daughter | — | Indiana |
| 47 | Claire O'Loughlin | 5 | daughter | — | Indiana |
| 48 | Joseph O'Loughlin | 3 | son | — | Indiana |
| 49 | Russell F. O'Loughlin | 1 | son | — | Massachusetts |
| 50 | Robert H. O'Loughlin | 0 | son | — | Massachusetts |
| 51 | William J. Bayley | 75 | uncle | — | Canada-Eng |
| 52 | William A. Mckinney | 41 | head | Carrier | Massachusetts |
| 53 | Alice G. Mckinney | 42 | wife | — | Massachusetts |
| 54 | Evelyn C. Mckinney | 16 | daughter | — | Massachusetts |
| 55 | Mary J. Mckinney THIS PERSON | 14 | daughter | — | Massachusetts |
| 56 | Alice G. Mckinney | 13 | daughter | — | Massachusetts |
| 57 | Bernice M. Mckinney | 8 | daughter | — | Massachusetts |
| 58 | William A. Mckinney | 7 | son | — | Massachusetts |
| 59 | Russell G. Mckinney | 4 | son | — | Massachusetts |
| 60 | Sheila A. Mckinney | 2 | daughter | — | Massachusetts |
| 61 | Joseph Denaro | 58 | head | Proprietor | Italy |
| 62 | Mary Q. Denaro | 44 | wife | — | Massachusetts |
| 63 | Rosaria Denaro | 27 | daughter | Operates Sewing Machine | Massachusetts |
| 64 | Mary J. Denaro | 3 | daughter | — | Massachusetts |
| 65 | Dominic J. Denaro | 20 | son | Waiter | Massachusetts |
| 66 | Joseph Denaro | 19 | son | Installer | Massachusetts |
| 67 | Louise Denaro | 17 | daughter | — | Massachusetts |
| 68 | Antoinette Denaro | 15 | daughter | — | Massachusetts |
| 69 | Ruth J. Lane | 35 | head | — | Maine |
| 70 | James E. Lane | 13 | son | — | Massachusetts |
| 71 | Patricia R. Lane | 12 | daughter | — | Massachusetts |
| 72 | Thomas J. Phelan | 27 | head | Salesman | Massachusetts |
| 73 | Mary E. Phelan | 28 | wife | — | Massachusetts |
| 74 | Annie L. Dowley | 62 | head | Bookkeeper | Massachusetts |
| 75 | Minnie Dowley | 75 | aunt | — | England |
| 76 | Emma Walford | 93 | head | — | England |
| 77 | Mary A. Kelley | 55 | head | — | Massachusetts |
| 78 | Lawrence J. Larkin | 44 | nephew | Foreman | Massachusetts |
| 79 | Daniel P. Cunningham | 66 | head | Janitor | Massachusetts |
| 80 | Jennie T. Cunningham | 57 | sister | — | 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)