MK
Mary Kirk — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Mary Kirk across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1863), then head of a 7-person household.
Age 77
b. ~1863
Female
Head
Born: Pennsylvania
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | Kirk |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 77 |
| Marital Status | Widowed |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1863 |
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 |
|---|---|---|---|---|
| Catherine Kirk | Daughter | — | 43 | ~1897 |
| Leo Kirk | Son | — | 47 | ~1893 |
| Mary Kirk | Head | — | 77 | ~1863 |
| William Kirk | Son | — | 55 | ~1885 |
| James Kirk | Son | — | 38 | ~1902 |
| Frank Kirk | Son | — | 53 | ~1887 |
| May Kirk | Daughter | — | 49 | ~1891 |
Census Appearances
1930
Philadelphia, Pennsylvania
Other, age 65
Philadelphia, Pennsylvania · implied b. ~1865 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kirk |
| Given Name | Mary |
| Relationship to Head | Lodger |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | New Jersey |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Philadelphia-County, Pennsylvania
Head, age 77
Philadelphia-County, Pennsylvania · implied b. ~1863 — 7 household members
| Surname | Kirk |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 77 |
| Marital Status | Widowed |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Hours Worked | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Kirk across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Kirk
Head · 1940 · age 77 · b. ~1863 · Pennsylvania
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03715-00577)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Sudwino Seon | 41 | Wife | — | Austria |
| 2 | Tedus Seon | 22 | Son | Window Cleaner | Pennsylvania |
| 3 | Stella Plonski | 49 | Head | Dressmaker | Poland |
| 4 | Tedus Plonski | 25 | Son | New Worker | Pennsylvania |
| 5 | Peter Komar | 55 | Head | Window Cleaner | Poland |
| 6 | Elizabeth Komar | 44 | Wife | Bldg Cleaner | Poland |
| 7 | Stanley Komar | 20 | Son | Locker Boy | Pennsylvania |
| 8 | Leon Komar | 18 | Son | — | Pennsylvania |
| 9 | Helen Komar | 16 | Daughter | — | Pennsylvania |
| 10 | Anna Schwitzu | 63 | Head | — | Pennsylvania |
| 11 | Elmer Schwitzu | 30 | Son | Clerk | Pennsylvania |
| 12 | Anna Schwitzu | 28 | Daughter | Instructor | Pennsylvania |
| 13 | Frederick Schwitzu | 25 | Son | Cashier | Pennsylvania |
| 14 | Elizabeth Beck | 60 | Head | Machine Operator | Pennsylvania |
| 15 | David B. Dunlop | 33 | Head | Loader | N. Ireland |
| 16 | Margaret Dunlop | 39 | Wife | Laundry Dept | Irish Free State |
| 17 | Bernard O'Donnell | 30 | Head | Clerical | Scotland |
| 18 | Marie O'Donnell | 31 | Wife | — | Pennsylvania |
| 19 | Marlene O'Donnell | 1 | Daughter | — | Pennsylvania |
| 20 | Josephine Yetter | 37 | Head | Stenographer | Pennsylvania |
| 21 | Mary D. Yetter | 17 | Daughter | — | Pennsylvania |
| 22 | Jane Yetter | 19 | Daughter | Clerk | Pennsylvania |
| 23 | Harry H. Ross | 30 | Head | Salesman | Pennsylvania |
| 24 | Evelyn Ross | 29 | Wife | — | Pennsylvania |
| 25 | Nesta Ross | 56 | Mother in law | — | Pennsylvania |
| 26 | Homer Ross | 26 | Brother in law | — | Pennsylvania |
| 27 | Mary Kirk THIS PERSON | 77 | Head | — | Pennsylvania |
| 28 | William Kirk | 55 | Son | Shoe Finisher | Pennsylvania |
| 29 | Frank Kirk | 53 | Son | Salesman | Pennsylvania |
| 30 | May Kirk | 49 | Daughter | Secretary | Pennsylvania |
| 31 | Leo Kirk | 47 | Son | Director | Pennsylvania |
| 32 | Catherine Kirk | 43 | Daughter | — | Pennsylvania |
| 33 | James Kirk | 38 | Son | Stevedore | Pennsylvania |
| 34 | David Robb | 22 | Head | White Washing | Pennsylvania |
| 35 | Katherine Robb | 21 | Wife | — | Pennsylvania |
| 36 | Elizabeth Robb | 0 | Daughter | — | Pennsylvania |
| 37 | John J. Mcclary | 49 | Head | Steam Fitter | Pennsylvania |
| 38 | Mary Ann Mcclary | 50 | Wife | General Utility | Pennsylvania |
| 39 | Florina S. Dean | 29 | Head | Mender | Pennsylvania |
| 40 | William Dean | 5 | Son | — | Pennsylvania |
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)