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James Mcdermott — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Allegheny, Pennsylvania
Our Model Tree links this James Mcdermott across the 1930 and 1940 US Censuses in Allegheny, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1901), then head of a 9-person household.
Age 29
b. ~1901
Male
Son
Born: Pennsylvania
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Allegheny, Pennsylvania |
| Surname | McDermott |
| Given Name | James J. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 20 |
| Father's Birthplace | Irish Free States |
| Mother's Birthplace | New York |
| Additional Details | |
| Occupation | Jobber |
| Industry | construction Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Jobber |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1901 |
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 1930 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Nancy Mcdermott | Daughter | — | 29 | ~1901 |
| Margaret Mcdermott | Daughter | — | 21 | ~1909 |
| Mary Mcdermott | Daughter | — | 34 | ~1896 |
| Ella Mcdermott | Daughter | — | 36 | ~1894 |
| James Mcdermott | Head | — | 71 | ~1859 |
| Alice Mcdermott | Other | — | 62 | ~1868 |
| Dennis Mcdermott | Son | — | 32 | ~1898 |
| James Mcdermott | Son | — | 29 | ~1901 |
| James Mcdermott | Son | — | 8 | ~1922 |
Census Appearances
1930
Allegheny, Pennsylvania
Son, age 29
Allegheny, Pennsylvania · implied b. ~1901 — 9 household members
| Surname | McDermott |
| Given Name | James J. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 20 |
| Father's Birthplace | Irish Free States |
| Mother's Birthplace | New York |
| Occupation | Jobber |
| Industry | construction Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Other, age 39
Allegheny-County, Pennsylvania · implied b. ~1901 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermot |
| Given Name | James J. |
| Relationship to Head | lodger |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh City |
| 1935 Residence (County) | Allegheny |
| Class of Worker | 0 |
| Highest Grade | H 2 |
| 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 James Mcdermott across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Mcdermott
Son · 1930 · age 29 · b. ~1901 · Pennsylvania
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Sibling
Ella Mcdermott
Sibling · 1930 · age 36
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nancy Mcdermott
Sibling · 1930 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mcdermott
Sibling · 1930 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dennis Mcdermott
Sibling · 1930 · age 32
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mcdermott
Sibling · 1930 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mcdermott
Sibling · 1930 · age 8
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
12 people indexed on this census page (ia:1930:fifteenthcensus00reel1971:1141)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ralph Luby | 27 | Head | Mechanic | Pennsylvania |
| 2 | Milla Luby | 24 | Wife-H | None | Pennsylvania |
| 3 | Milla Jr. Luby | 1 | daughter | None | Pennsylvania |
| 4 | James A. Mcdermott | 71 | Head | None | Irish Free States |
| 5 | Alice James Mcdermott | 62 | Wife-H | None | New York |
| 6 | Ella Mcdermott | 36 | daughter | Clerk | Pennsylvania |
| 7 | Mary Mcdermott | 34 | daughter | Teacher | Pennsylvania |
| 8 | Dennis Mcdermott | 32 | son | Dispatcher | Pennsylvania |
| 9 | James J. Mcdermott THIS PERSON | 29 | son | Jobber | Pennsylvania |
| 10 | Nancy J. Mcdermott | 29 | daughter | Stenographer | Pennsylvania |
| 11 | Margaret Mcdermott | 21 | daughter | Stenographer | Pennsylvania |
| 12 | James A. Jr. Mcdermott | 8 | son | None | 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)