MB
Mary Blair — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Philadelphia, Pennsylvania
Our Model Tree links this Mary Blair across the 1920 and 1930 US Censuses in Philadelphia, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1912), then head of a 10-person household.
Age 18
b. ~1912
Female
Daughter
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Philadelphia, Pennsylvania |
| Surname | Blair |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Additional Details | |
| Occupation | Operator |
| Industry | Mill |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Operator |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1912 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Ellen Blair | Daughter | — | 22 | ~1908 |
| Elizabeth Blair | Daughter | — | 11 | ~1919 |
| Mary Blair | Daughter | — | 18 | ~1912 |
| Catherine Blair | Daughter | — | 20 | ~1910 |
| Lavinnia Blair | Daughter | — | 13 | ~1917 |
| Lavinnia Blair | Head | — | 47 | ~1883 |
| David Blair | Son | — | 9 | ~1921 |
| Cornelius Blair | Son | — | 24 | ~1906 |
| Robert Blair | Son | — | 5 | ~1925 |
| Robert Blair | Spouse | — | 44 | ~1886 |
Census Appearances
1920
Philadelphia, Pennsylvania
Daughter, age 8
Philadelphia, Pennsylvania · implied b. ~1912 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blair |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Philadelphia, Pennsylvania
Daughter, age 18
Philadelphia, Pennsylvania · implied b. ~1912 — 10 household members
| Surname | Blair |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Operator |
| Industry | Mill |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 Blair across 2 US Census years (1920 and 1930) in Philadelphia, Pennsylvania, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Blair
Daughter · 1930 · age 18 · b. ~1912 · Pennsylvania
★ You are viewing this record
Sibling
Ellen Blair
Sibling · 1930 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Blair
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Blair
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Blair
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lavinnia Blair
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cornelius Blair
Sibling · 1930 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Blair
Sibling · 1930 · age 20
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 — Philadelphia, Pennsylvania
Open full size
1930 US Federal Census — Philadelphia, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel2124:1066)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Emil P. Kempter | 43 | Head | Bookkeeper | Germany |
| 52 | Florence Kempter | 37 | Wife | — | Pennsylvania |
| 53 | Florence W. Kempter | 18 | Daughter | — | Pennsylvania |
| 54 | Phillip J. Kempter | 17 | Son | — | Pennsylvania |
| 55 | Herbert Harmon | 38 | Head | Salesman | New York |
| 56 | Mamie Harmon | 35 | Wife | Operator | Virginia |
| 57 | Jennie Houser | 50 | Head | — | Pennsylvania |
| 58 | John A. Houser | 50 | Husband | Blacksmith | Pennsylvania |
| 59 | William Goodman | 28 | Nephew | Electrician | Pennsylvania |
| 60 | Mary C. Bonner | 47 | Head | Dressmaker | Pennsylvania |
| 61 | Anna Bonner | 72 | Mother | — | Pennsylvania |
| 62 | Thomas Hurst | 30 | Roomer | Chauffeur | Pennsylvania |
| 63 | C. Hurst | 58 | Roomer | Saleswoman | Pennsylvania |
| 64 | Emma Jolley | 74 | Head | — | Virginia |
| 65 | Mary A. Kuhl | 65 | Sister | Dressmaker | Virginia |
| 66 | Lloyd Eisenhart | 35 | Head | Plumber | Pennsylvania |
| 67 | Lillian Eisenhart | 36 | Wife | — | Pennsylvania |
| 68 | George Eisenhart | 9 | Son | — | Pennsylvania |
| 69 | Marie Eisenhart | 8 | Daughter | — | Pennsylvania |
| 70 | Kathryn Eisenhart | 5 | Daughter | — | Pennsylvania |
| 71 | William Ficken | 65 | Head | Foreman | Pennsylvania |
| 72 | Anna Ficken | 50 | Wife | — | France |
| 73 | Andrew Neels | 26 | Head | Salesman | Pennsylvania |
| 74 | Ellen Neels | 28 | Wife | — | Northern Ireland |
| 75 | Andrew Neels | 15 | Son | — | Pennsylvania |
| 76 | Margaret Neels | 8 | Daughter | — | Pennsylvania |
| 77 | Hubert Ernestine | 50 | Roomer | Cabinet Maker | Germany |
| 78 | James Hall | 55 | Roomer | Floor Supt. | Virginia |
| 79 | Clara Kafty | 62 | Head | Carpet Winder | Germany |
| 80 | Harry Kafty | 62 | Husband | — | Pennsylvania |
| 81 | Magdalena Hannings | 59 | Head | — | Pennsylvania |
| 82 | Joseph N. Hannings | 65 | Husband | Engineer | Pennsylvania |
| 83 | Candelario Vigil | 32 | Husband | Engraver | Colorado |
| 84 | Edna Vigil | 30 | Wife | — | Pennsylvania |
| 85 | Lavinnia Blair | 47 | Head | — | Scotland |
| 86 | Robert Blair | 44 | Husband | Operator | Scotland |
| 87 | Cornelius Blair | 24 | Son | Plumber | Pennsylvania |
| 88 | Ellen S. Blair | 22 | Daughter | — | Pennsylvania |
| 89 | Catherine Blair | 20 | Daughter | Operator | Pennsylvania |
| 90 | Mary Blair THIS PERSON | 18 | Daughter | Operator | Pennsylvania |
| 91 | Lavinnia Blair | 13 | Daughter | — | Pennsylvania |
| 92 | Elizabeth Blair | 11 | Daughter | — | Pennsylvania |
| 93 | David Blair | 9 | Son | — | Pennsylvania |
| 94 | Robert Blair | 5 | Son | — | Pennsylvania |
| 95 | Arthur Wiley | 41 | Head | Engineer | Pennsylvania |
| 96 | Inez Calab | 41 | Boarder | Operator | Delaware |
| 97 | Margaret Strasser | 47 | Roomer | Saleslady | Pennsylvania |
| 98 | William Shaughnessy | 46 | Head | — | Pennsylvania |
| 99 | James Shaughnessy | 48 | Husband | Metal Worker | New York |
| 100 | Jeanetta Shaughnessy | 22 | Daughter | Operator | Pennsylvania |
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)