MC
Mary Clifford — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Allegheny, Pennsylvania
Our Model Tree links this Mary Clifford across the 1920 and 1930 US Censuses in Allegheny, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1912), then head of a 7-person household.
Age 18
b. ~1912
Female
Daughter
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Allegheny, Pennsylvania |
| Surname | Clifford |
| Given Name | Mary J. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Pittsburgh 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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Francis Clifford | Son | — | 11 | ~1919 |
| Helen Clifford | Daughter | — | 21 | ~1909 |
| Ella Adams | Other | — | 87 | ~1843 |
| Joseph Clifford | Son | — | 13 | ~1917 |
| Mary Clifford | Daughter | — | 18 | ~1912 |
| Frances Clifford | Spouse | — | 51 | ~1879 |
| Joseph Clifford | Head | — | 57 | ~1873 |
Census Appearances
1920
Allegheny, Pennsylvania
Daughter, age 7
Allegheny, Pennsylvania · implied b. ~1913 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clifford |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Daughter, age 18
Allegheny, Pennsylvania · implied b. ~1912 — 7 household members
| Surname | Clifford |
| Given Name | Mary J. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| 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 Clifford across 2 US Census years (1920 and 1930) in Allegheny, Pennsylvania, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Clifford
Daughter · 1930 · age 18 · b. ~1912 · Pennsylvania
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Sibling
Joseph Clifford
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Clifford
Sibling · 1930 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Clifford
Sibling · 1930 · age 11
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 — Allegheny, Pennsylvania
Open full size
1930 US Federal Census — Allegheny, Pennsylvania
Page Contents
38 people indexed on this census page (ia:1930:fifteenthcensus00reel1974:0864)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Virginia Killian | 15 | daughter | — | Pennsylvania |
| 52 | Marcella Killian | 13 | daughter | — | Pennsylvania |
| 53 | John Killian | 11 | son | — | Pennsylvania |
| 54 | Julia Killian | 73 | mother | — | Ireland |
| 55 | Herman H. Missner | 34 | head | — | Pennsylvania |
| 56 | Bertha Missner | 32 | wife | — | Pennsylvania |
| 57 | Emma Missner | 11 | daughter | — | Pennsylvania |
| 58 | Thomas Killian | 51 | head | — | Pennsylvania |
| 59 | Josephine Killian | 57 | wife | — | Ireland |
| 60 | Thaddeus Killian | 25 | son | — | Pennsylvania |
| 61 | Eugene Killian | 22 | son | — | Pennsylvania |
| 62 | Francis Killian | 18 | son | — | Pennsylvania |
| 63 | Ignatius Dziopoziel | 43 | head | — | Poland |
| 64 | Sophie Dziopoziel | 41 | wife | — | Poland |
| 65 | Helen Dziopoziel | 18 | daughter | — | Pennsylvania |
| 66 | Sophie Dziopoziel | 15 | daughter | — | Pennsylvania |
| 67 | Patrick Berlin | 41 | head | — | Irish Free State |
| 68 | Rose Berlin | 38 | wife | — | Irish Free State |
| 69 | Thomas Hunton | 30 | head | — | Pennsylvania |
| 70 | Florence Hunton | 28 | wife | — | Pennsylvania |
| 71 | Thomas Jr. Hunton | 4 | son | — | Pennsylvania |
| 72 | Vera Hunton | 2 | daughter | — | Pennsylvania |
| 73 | Catherine Mccoy | 65 | lodger | — | Pennsylvania |
| 74 | Ellen Mckibben | 57 | head | — | Irish Free State |
| 75 | Joseph Clifford | 57 | head | Chauffeur | Pennsylvania |
| 76 | Frances Clifford | 51 | wife | — | Pennsylvania |
| 77 | Helen Clifford | 21 | daughter | — | Pennsylvania |
| 78 | Mary J. Clifford THIS PERSON | 18 | daughter | — | Pennsylvania |
| 79 | Joseph Jr. Clifford | 13 | son | — | Pennsylvania |
| 80 | Francis Clifford | 11 | son | — | Pennsylvania |
| 81 | Ella Adams | 87 | mother-in-law | — | England |
| 82 | Bessie Sowa | 45 | head | — | Poland |
| 83 | Michael Sowa | 23 | son | — | Pennsylvania |
| 84 | Anna Sowa | 21 | daughter | — | Pennsylvania |
| 85 | Mary Sowa | 17 | daughter | — | Pennsylvania |
| 86 | Margaret Evans | 44 | head | — | Pennsylvania |
| 87 | Donald Evans | 12 | son | — | Pennsylvania |
| 88 | Charlotte Wontrowski | 21 | daughter | — | 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)