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Mary Mckay — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Essex, Massachusetts
Our Model Tree links this Mary Mckay across the 1930 and 1940 US Censuses in Essex, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 6-person household.
Age 0
b. ~1930
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Essex, Massachusetts |
| Surname | McKay |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Additional Details | |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Salem City Of |
| 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.
6 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mckay | Daughter | — | ~1930 | |
| Lillian Mckay | Daughter | — | 3 | ~1927 |
| Catherine Mckay | Other | — | 32 | ~1898 |
| James Mckay | Son | — | 6 | ~1924 |
| Catherine Mckay | Daughter | — | 7 | ~1923 |
| James Mckay | Head | — | 34 | ~1896 |
Census Appearances
1930
Essex, Massachusetts
Daughter, age
Essex, Massachusetts · implied b. ~1930 — 6 household members
| Surname | McKay |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Essex-County, Massachusetts
Daughter, age 10
Essex-County, Massachusetts · implied b. ~1930 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | M'Kay |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Salem City |
| Highest Grade | No 4 |
| 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 Mckay across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mckay
Daughter · 1930 · age 0 · b. ~1930 · Massachusetts
★ You are viewing this record
Sibling
Catherine Mckay
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lillian Mckay
Sibling · 1930 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mckay
Sibling · 1930 · age 6
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
1930 US Federal Census — Essex, Massachusetts
Open full size
1930 US Federal Census — Essex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:massachusettscensus00reel903:0323)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Rita R Powers | 7 | Daughter | — | Massachusetts |
| 2 | Francis J Powers | 1 | Son | — | Massachusetts |
| 3 | Ralph W Robinson | 38 | Head | Laborer | Massachusetts |
| 4 | Grace R Robinson | 27 | Wife-H | Salesman | England |
| 5 | Marion G Robinson | 17 | Daughter | — | Massachusetts |
| 6 | Charles E Robinson | 15 | Son | Servant | Massachusetts |
| 7 | Gladys L Robinson | 13 | Daughter | — | Massachusetts |
| 8 | Dorothy E Robinson | 11 | Daughter | — | Massachusetts |
| 9 | Ralph W Jr Robinson | 9 | Son | — | Massachusetts |
| 10 | Ruth R Robinson | 7 | Daughter | — | Massachusetts |
| 11 | Arthur M Robinson | 5 | Daughter | — | Massachusetts |
| 12 | George R Robinson | 3 | Son | — | Massachusetts |
| 13 | Edward J Gaynor | 31 | Head | Stationary Engineer | Massachusetts |
| 14 | Esther J Gaynor | 33 | Wife-H | — | Massachusetts |
| 15 | Edward G Gaynor | 8 | Son | — | Massachusetts |
| 16 | Gertrude L Gaynor | 2 | Daughter | — | Massachusetts |
| 17 | John J Lewis | 70 | Head | Carpenter | Canada English |
| 18 | Clara E Lewis | 66 | Wife-H | — | New Hampshire |
| 19 | Laura P Lewis | 32 | Daughter | Secretary | New Hampshire |
| 20 | William A Ellison | 39 | Head | Draughtsman | Massachusetts |
| 21 | Laura M Ellison | 36 | Wife-H | — | Massachusetts |
| 22 | Arthur G Ellison | 14 | Son | — | Massachusetts |
| 23 | George P Ellison | 13 | Son | — | Massachusetts |
| 24 | Laura J Ellison | 3 | Daughter | — | Massachusetts |
| 25 | William J Manning | 32 | Head | Worker | Massachusetts |
| 26 | Alice M Manning | 33 | Wife-H | — | Massachusetts |
| 27 | Alice M Manning | 11 | Daughter | — | Massachusetts |
| 28 | Dorothy M Manning | 10 | Daughter | — | Massachusetts |
| 29 | Peter J Manning | 6 | Daughter | — | Massachusetts |
| 30 | James Mckay | 34 | Head | Machinist | Irish Free State |
| 31 | Catherine E Mckay | 32 | Wife-H | — | Irish Free State |
| 32 | Catherine E Mckay | 7 | Daughter | — | Massachusetts |
| 33 | James H Mckay | 6 | Son | — | Massachusetts |
| 34 | Lillian M Mckay | 3 | Daughter | — | Massachusetts |
| 35 | Mary Mckay THIS PERSON | 0 | Daughter | — | Massachusetts |
| 36 | Theodore Prologis | 44 | Head | Proprietor | Greece |
| 37 | Katherine S Prologis | 43 | Wife-H | — | Greece |
| 38 | Anastasia Prologis | 17 | Daughter | — | New Hampshire |
| 39 | Christine Prologis | 15 | Daughter | — | New Hampshire |
| 40 | Athena Prologis | 12 | Daughter | — | New Hampshire |
| 41 | Paul Prologis | 9 | Son | — | New Hampshire |
| 42 | Constantine Prologis | 7 | Son | — | Massachusetts |
| 43 | John S Zubiel | 53 | Head | Machinist | Massachusetts |
| 44 | Josephine Zubiel | 57 | Wife-H | — | Massachusetts |
| 45 | Marguerite Zubiel | 21 | Daughter | — | Massachusetts |
| 46 | Thomas J Broughton | 44 | Head | Salesman | Massachusetts |
| 47 | Alice E Broughton | 44 | Wife-H | — | Massachusetts |
| 48 | Sally B Broughton | 12 | Daughter | — | Massachusetts |
| 49 | Nellie V Larrabee | 58 | Head-H | — | Massachusetts |
| 50 | Helen G Larrabee | 28 | Daughter | Stenographer | Massachusetts |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)