MK
Mary Kirby — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Mary Kirby across the 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1880), then head of a 9-person household.
Age 60
b. ~1880
Female
Head
Born: Irish Free State
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Kirby |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 60 |
| Marital Status | Widowed |
| Birthplace | Irish Free State |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Naturalization Status | Naturalized |
| Additional Details | |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birthplace (normalized) | irish free state |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1880 |
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 |
|---|---|---|---|---|
| Joseph Kirby | Other | — | 22 | ~1918 |
| Hannah Kirby | Daughter | — | 30 | ~1910 |
| Mary Kirby | Daughter | — | 28 | ~1912 |
| Ellen Kirby | Daughter | — | 20 | ~1920 |
| Katherine Kirby | Daughter | — | 23 | ~1917 |
| James Kirby | Son | — | 15 | ~1925 |
| Nora Kirby | Daughter | — | 26 | ~1914 |
| Mary Kirby | Head | — | 60 | ~1880 |
| John Kirby | Son | — | 32 | ~1908 |
Census Appearances
1930
Allegheny, Pennsylvania
Other, age 50
Allegheny, Pennsylvania · implied b. ~1880 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kirby |
| Given Name | Mary |
| Relationship to Head | Mother |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Widowed |
| Birthplace | Irish Free State |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | 1930 |
| Class of Worker | Yes |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birthplace (normalized) | irish free state |
1940
Allegheny-County, Pennsylvania
Head, age 60
Allegheny-County, Pennsylvania · implied b. ~1880 — 9 household members
| Surname | Kirby |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 60 |
| Marital Status | Widowed |
| Birthplace | Irish Free State |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Naturalization Status | Naturalized |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birthplace (normalized) | irish free state |
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 Kirby across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Kirby
Head · 1940 · age 60 · b. ~1880 · Pennsylvania
★ 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 — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03657-00216)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Sophie Sanetha | 47 | Wife | — | Poland |
| 42 | Jane Sanetha | 19 | Daughter | New Worker | Pennsylvania |
| 43 | Stanley Pawlicki | 26 | Head | Chipper | Pennsylvania |
| 44 | Estelle Pawlicki | 25 | Wife | — | Pennsylvania |
| 45 | Stanley Pawlicki | 5 | Son | — | Pennsylvania |
| 46 | Patricia Pawlicki | 4 | Daughter | — | Pennsylvania |
| 47 | Mary Kirby THIS PERSON | 60 | Head | — | Irish Free State |
| 48 | John Kirby | 32 | Son | Weighter | Pennsylvania |
| 49 | Hannah Kirby | 30 | Daughter | Clerk | Pennsylvania |
| 50 | Mary Kirby | 28 | Daughter | Clerk | Pennsylvania |
| 51 | Nora Kirby | 26 | Daughter | Page | Pennsylvania |
| 52 | Katherine Kirby | 23 | Daughter | Packer | Pennsylvania |
| 53 | Ellen Kirby | 20 | Daughter | Sales-Clerk | Pennsylvania |
| 54 | James Kirby | 15 | Son | — | Pennsylvania |
| 55 | Joseph Kirby | 22 | Nephew | New Worker | Pennsylvania |
| 56 | Robert Hutchinson | 57 | Head | Patrol Inspector | Pennsylvania |
| 57 | Edna Hutchinson | 53 | Wife | — | Pennsylvania |
| 58 | Margaret Hutchinson | 24 | Daughter | Clerk | Pennsylvania |
| 59 | Grace Hutchinson | 18 | Daughter | — | Pennsylvania |
| 60 | Harry Carson | 68 | Head | — | Pennsylvania |
| 61 | Agnes Carson | 65 | Wife | — | Pennsylvania |
| 62 | Grace Carson | 28 | Daughter | File Clerk | Pennsylvania |
| 63 | Frank F. Knabl | 58 | Head | Brakeman | Pennsylvania |
| 64 | Marie Knabl | 45 | Wife | — | Germany |
| 65 | Robert Pyle | 24 | Boarder | Handyman | Ohio |
| 66 | Henry Linn | 24 | Head | Paint Mixer | Pennsylvania |
| 67 | Gertrude Linn | 21 | Wife | — | Pennsylvania |
| 68 | Dolores Linn | 2 | Daughter | — | Pennsylvania |
| 69 | Patricia Linn | 1 | Daughter | — | Pennsylvania |
| 70 | Jennie Lewandowsky | 20 | Sister-in-law | Housework | Pennsylvania |
| 71 | Joseph Aracin | 41 | Head | Steel Dipper | Poland |
| 72 | Veronica Aracin | 37 | Wife | — | Pennsylvania |
| 73 | Eugenia Aracin | 10 | Daughter | — | Pennsylvania |
| 74 | Joan Aracin | 9 | Daughter | — | Pennsylvania |
| 75 | Charles Fanning | 32 | Head | Shipping Clerk | Pennsylvania |
| 76 | Marie Fanning | 25 | Wife | — | Pennsylvania |
| 77 | Herbert Fanning | 6 | Son | — | Pennsylvania |
| 78 | Anthony Swiderski | 62 | Head | Handyman | Poland |
| 79 | Helen Swiderski | 57 | Wife | — | Poland |
| 80 | Edmond Swiderski | 22 | Son | Salesman | Pennsylvania |
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)