MF
Mary Finn — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Mary Finn across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 10-person household.
Age 11
b. ~1929
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | Finn |
| Given Name | Mary T |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Philadelphia |
| Est. Birth Year | ~1929 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| John Finn | Son | — | 13 | ~1927 |
| Joseph Finn | Son | — | 5 | ~1935 |
| Julia Finn | Spouse | — | 38 | ~1902 |
| Bernard Finn | Son | — | 17 | ~1923 |
| James Finn | Son | — | 8 | ~1932 |
| Kathrine Finn | Daughter | — | 2 | ~1938 |
| Mary Finn | Daughter | — | 11 | ~1929 |
| Patrick Finn | Head | — | 49 | ~1891 |
| Margaret Finn | Daughter | — | 15 | ~1925 |
| Thomas Finn | Son | — | 6 | ~1934 |
Census Appearances
1930
Philadelphia, Pennsylvania
Daughter, age 1
Philadelphia, Pennsylvania · implied b. ~1929 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Finn |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Age at First Marriage | 1 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Philadelphia-County, Pennsylvania
Daughter, age 11
Philadelphia-County, Pennsylvania · implied b. ~1929 — 10 household members
| Surname | Finn |
| Given Name | Mary T |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Highest Grade | No 4 |
| 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 Finn across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Finn
Daughter · 1940 · age 11 · b. ~1929 · Pennsylvania
★ You are viewing this record
Sibling
Bernard Finn
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Finn
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Finn
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Finn
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Finn
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Finn
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathrine Finn
Sibling · 1940 · age 2
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 — 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-t0627-03732-00987)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Sylvester Morgan | 75 | Step Father | Watchman | Pennsylvania |
| 2 | Patrick Finn | 49 | Head | Laborer | Irish Free State |
| 3 | Julia Finn | 38 | Wife | — | Irish Free State |
| 4 | Bernard Finn | 17 | Son | New Worker | Pennsylvania |
| 5 | Margaret Finn | 15 | Daughter | — | Pennsylvania |
| 6 | John Finn | 13 | Son | — | Pennsylvania |
| 7 | Mary T Finn THIS PERSON | 11 | Daughter | — | Pennsylvania |
| 8 | James H Finn | 8 | Son | — | Pennsylvania |
| 9 | Thomas F Finn | 6 | Son | — | Pennsylvania |
| 10 | Joseph Finn | 5 | Son | — | Pennsylvania |
| 11 | Kathrine Finn | 2 | Daughter | — | Pennsylvania |
| 12 | Hugh O'Conner | 61 | Head | Laborer | Irish Free State |
| 13 | Margaret O'Conner | 47 | Wife | — | Irish Free State |
| 14 | Elisabeth O'Conner | 25 | Daughter | Packer | Pennsylvania |
| 15 | Rosanna O'Conner | 19 | Daughter | Assembler | Pennsylvania |
| 16 | Mary O'Conner | 16 | Daughter | — | Pennsylvania |
| 17 | Charles O'Conner | 12 | Son | — | Pennsylvania |
| 18 | Hugh O'Conner | 10 | Son | — | Pennsylvania |
| 19 | Thomas Madden | 56 | Head | Watchman | Irish Free State |
| 20 | Joseph Madden | 31 | Son | Driver | Pennsylvania |
| 21 | Francis Madden | 24 | Son | Laborer | Pennsylvania |
| 22 | William Mullen | 31 | Son in Law | Painter | Pennsylvania |
| 23 | Mary Mullen | 32 | Daughter | — | Pennsylvania |
| 24 | William Mullen | 3 | Grandson | — | Pennsylvania |
| 25 | Gustaf Richard | 31 | Head | Heddle Maker | Pennsylvania |
| 26 | Annamae Richard | 31 | Wife | — | Pennsylvania |
| 27 | Gustaf Richard | 6 | Son | — | Pennsylvania |
| 28 | Maria Richard | 3 | Daughter | — | Pennsylvania |
| 29 | Maria Gillmartin | 63 | Mother in Law | Sheeter | Irish Free State |
| 30 | George Ashby | 67 | Head | Laborer | New Jersey |
| 31 | Gertrude Ashby | 53 | Wife | — | District of Columbia |
| 32 | John Ashby | 28 | Son | Cook | District of Columbia |
| 33 | Madison Ashby | 20 | Son | Clerk | District of Columbia |
| 34 | William Jackson | 1 | Grandson | — | New York |
| 35 | Edgar Davis | 47 | Head | Laborer | Alabama |
| 36 | Ella Davis | 44 | Wife | — | Alabama |
| 37 | James Trotter | 19 | Nephew | New Worker | Alabama |
| 38 | George Huntley | 37 | Head | — | N. Carolina |
| 39 | Sahra Huntley | 37 | Wife | — | N. Carolina |
| 40 | Morris Barkley | 31 | Head | Blacksmith | Virginia |
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)