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James Duncan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this James Duncan across the 1910, 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1877), then head of a 4-person household.
Age 63
b. ~1877
Male
Head
Born: Scotland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Duncan |
| Given Name | James T |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | McKeesport City |
| 1935 Residence (County) | Allegheny |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Plumber |
| Industry | Private business |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 2000 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Occupation | Plumber |
| Township / Ward | Mckeesport City |
| Est. Birth Year | ~1877 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| James Duncan | Head | — | 63 | ~1877 |
| Isabelle Torrence | Other | — | 18 | ~1922 |
| Neil Duncan | Son | — | 29 | ~1911 |
| Isabelle Duncan | Spouse | — | 60 | ~1880 |
Census Appearances
1910
Allegheny, Pennsylvania
Head, age 33
Allegheny, Pennsylvania · implied b. ~1877 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Scotland |
| Years Married | 5 |
| Year of Immigration | 1906 |
| Naturalization Status | Alien |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Plumber |
| Industry | Tube Works |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1920
Allegheny, Pennsylvania
Head, age 44
Allegheny, Pennsylvania · implied b. ~1876 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | James D |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Scotland |
| Year of Immigration | 1904 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Laborer |
| Industry | Steel mill |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Scotch |
| Home Owned/Rented | R |
| Birth Country | Scotland |
| Year of Naturalization | 1912 |
| Birthplace (normalized) | scotland |
1930
Allegheny, Pennsylvania
Head, age 53
Allegheny, Pennsylvania · implied b. ~1877 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | James T |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1907 |
| Age at First Marriage | 27 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Plumber |
| Industry | Plumbing Shop |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 5000 |
| Radio Set | R |
| Veteran | No |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Allegheny-County, Pennsylvania
Head, age 63
Allegheny-County, Pennsylvania · implied b. ~1877 — 4 household members
| Surname | Duncan |
| Given Name | James T |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | McKeesport City |
| 1935 Residence (County) | Allegheny |
| Naturalization Status | Naturalized |
| Occupation | Plumber |
| Industry | Private business |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 2000 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 Duncan across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
James Duncan
Head · 1940 · age 63 · b. ~1877 · 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-t0627-03409-00204)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | James F Mellinger | 2 | son | — | Pennsylvania |
| 42 | John Kirk | 45 | head | Laborer | Pennsylvania |
| 43 | Loretta Kirk | 40 | wife | — | Pennsylvania |
| 44 | Mary E Kirk | 14 | daughter | — | Pennsylvania |
| 45 | John Kirk | 10 | son | — | Pennsylvania |
| 46 | Herman Fairbaugh | 38 | head | Foreman | Pennsylvania |
| 47 | Naomi A Fairbaugh | 37 | wife | — | Pennsylvania |
| 48 | Ruth Fairbaugh | 15 | daughter | — | Pennsylvania |
| 49 | Doris Fairbaugh | 13 | daughter | — | Pennsylvania |
| 50 | Betty Fairbaugh | 12 | daughter | — | Pennsylvania |
| 51 | Robert Fairbaugh | 7 | son | — | Pennsylvania |
| 52 | Ernest Orman | 61 | head | Laborer | Sweden |
| 53 | Cecilia A Orman | 56 | wife | — | Sweden |
| 54 | Charles M Parke | 44 | head | Teacher | Illinois |
| 55 | Alice Mae Parke | 30 | wife | — | Pennsylvania |
| 56 | Robert H Parke | 9 | son | — | Pennsylvania |
| 57 | Clara R Parke | 65 | mother | — | New Hampshire |
| 58 | Blank Blank | None | BLANK | Blank | BLANK |
| 59 | Charles J Stewart | 45 | head | Millwright | Scotland |
| 60 | Margaret A Stewart | 40 | wife | Sales Clerk | Scotland |
| 61 | James T Duncan THIS PERSON | 63 | head | Plumber | Scotland |
| 62 | Isabelle C Duncan | 60 | wife | — | Scotland |
| 63 | Neil B Duncan | 29 | son | Metallurgist | Scotland |
| 64 | Isabelle Torrence | 18 | niece | Stenographer | Scotland |
| 65 | Fred Downs | 60 | head | Carpenter | Pennsylvania |
| 66 | Marjorie Downs | 51 | wife | — | Pennsylvania |
| 67 | Ernest Downs | 23 | son | Machinist | Maryland |
| 68 | Marian Downs | 22 | daughter | Stenographer | Maryland |
| 69 | Ivan Downs | 18 | son | — | Maryland |
| 70 | James A Mcsidey | 43 | head | Foreman | Hungary |
| 71 | Anna Mcsidey | 40 | wife | — | Hungary |
| 72 | Thomas M Dugan | 60 | head | Foreman | Pennsylvania |
| 73 | Anna Dugan | 58 | wife | — | Pennsylvania |
| 74 | Mary Dugan | 32 | daughter | — | Pennsylvania |
| 75 | Helen Dugan | 28 | daughter | Clerk | Pennsylvania |
| 76 | Catherine Dugan | 24 | daughter | — | Pennsylvania |
| 77 | Thomas Dugan | 20 | son | Laborer | Pennsylvania |
| 78 | John Dugan | 17 | son | — | Pennsylvania |
| 79 | Elizabeth Dugan | 15 | daughter | — | Pennsylvania |
| 80 | Joseph H Bechtel | 40 | head | Laborer | Pennsylvania |
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)