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John Duncan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Armstrong-County, Pennsylvania
Our Model Tree links this John Duncan across the 1920, 1930 and 1940 US Censuses in Armstrong-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents John — first a head (b.~1903), then head of a 6-person household.
Age 37
b. ~1903
Male
Head
Born: Pennsylvania
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Armstrong-County, Pennsylvania |
| Surname | Duncan |
| Given Name | John C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Cadogan Twp |
| 1935 Residence (County) | Armstrong |
| Additional Details | |
| Occupation | Cutter |
| Industry | Coal mine |
| Class of Worker | PW |
| Hours Worked | 21 |
| Income (1939) | 602 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Cutter |
| Township / Ward | Cadogan Twp |
| Est. Birth Year | ~1903 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Audrey Duncan | Daughter | — | 14 | ~1926 |
| John Duncan | Head | — | 37 | ~1903 |
| Edward Duncan | Son | — | 15 | ~1925 |
| John Duncan | Son | — | 9 | ~1931 |
| Harry Duncan | Son | — | 12 | ~1928 |
| Clara Duncan | Spouse | — | 33 | ~1907 |
Census Appearances
1920
Armstrong, Pennsylvania
Son, age 17
Armstrong, Pennsylvania · implied b. ~1903 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | John C |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Miner |
| Industry | Coal mine |
| Class of Worker | W |
| Can Read | No |
| Can Write | No |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Armstrong, Pennsylvania
Head, age 27
Armstrong, Pennsylvania · implied b. ~1903 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | John C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 21 |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Miner |
| Industry | Coal Mines |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | $6 |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Armstrong-County, Pennsylvania
Head, age 37
Armstrong-County, Pennsylvania · implied b. ~1903 — 6 household members
| Surname | Duncan |
| Given Name | John C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Cadogan Twp |
| 1935 Residence (County) | Armstrong |
| Occupation | Cutter |
| Industry | Coal mine |
| Class of Worker | PW |
| Hours Worked | 21 |
| Income (1939) | 602 |
| Highest Grade | No 6 |
| 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 John Duncan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Duncan (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Duncan
b. ~1862
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Duncan
Head · 1940 · age 37 · b. ~1903 · 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 — Armstrong-County, Pennsylvania
Open full size
1940 US Federal Census — Armstrong-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03422-00244)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Robert E. Stover | 55 | Head | Coal Miner | Pennsylvania |
| 42 | Dora B. Stover | 49 | Wife | — | Pennsylvania |
| 43 | Earl Stover | 25 | Son | Cutter | Pennsylvania |
| 44 | Margaret Stover | 15 | Daughter | — | Pennsylvania |
| 45 | Robert A. Stover | 13 | Son | — | Pennsylvania |
| 46 | William K. Stover | 9 | Son | — | Pennsylvania |
| 47 | Jesse R. Holdenville | 40 | Head | Cutter | Iowa |
| 48 | M. Stella Holdenville | 41 | Wife | — | Pennsylvania |
| 49 | Harry S. Holdenville | 23 | Son | Loader | Pennsylvania |
| 50 | Grant E. Holdenville | 18 | Son | New Worker | Pennsylvania |
| 51 | John H. Holdenville | 15 | Son | — | Pennsylvania |
| 52 | Merle E. Holdenville | 14 | Son | — | Pennsylvania |
| 53 | Caroline E. Holdenville | 12 | Daughter | — | Pennsylvania |
| 54 | Oscar B. Holdenville | 10 | Son | — | Pennsylvania |
| 55 | Mable L. Holdenville | 9 | Daughter | — | Pennsylvania |
| 56 | Althea M. Holdenville | 6 | Daughter | — | Pennsylvania |
| 57 | Chauncey R. Holdenville | 4 | Son | — | Pennsylvania |
| 58 | Jean Marie Holdenville | 2 | Daughter | — | Pennsylvania |
| 59 | Charles D. Runhard | 37 | Head | Loader | Pennsylvania |
| 60 | Patricia Runhard | 6 | Daughter | — | Pennsylvania |
| 61 | John C. Duncan THIS PERSON | 37 | Head | Cutter | Pennsylvania |
| 62 | Clara D. Duncan | 33 | Wife | — | Pennsylvania |
| 63 | Edward M. Duncan | 15 | Son | — | Pennsylvania |
| 64 | Audrey Duncan | 14 | Daughter | — | Pennsylvania |
| 65 | Harry C. Duncan | 12 | Son | — | Pennsylvania |
| 66 | John R. Duncan | 9 | Son | — | Pennsylvania |
| 67 | Joseph Rounds | 61 | Head | Assistant Foreman | England |
| 68 | Alice Rounds | 60 | Wife | — | England |
| 69 | Samuel Rounds | 22 | Son | Clerk | Pennsylvania |
| 70 | Harry S. Rounds | 18 | Son | Delivery Boy | Pennsylvania |
| 71 | Harold L. Ryan | 41 | Head | Track Layer | Pennsylvania |
| 72 | June Ryan | 39 | Wife | — | Pennsylvania |
| 73 | James Ryan | 15 | Son | — | Pennsylvania |
| 74 | Frances Jean Ryan | 14 | Daughter | — | Pennsylvania |
| 75 | John Ryan | 12 | Son | — | Pennsylvania |
| 76 | Maureen Ryan | 10 | Daughter | — | Pennsylvania |
| 77 | Anne Ryan | 8 | Daughter | — | Pennsylvania |
| 78 | William Ryan | 5 | Son | — | Pennsylvania |
| 79 | Nick A. De Barry | 54 | Head | Section Foreman | Italy |
| 80 | Mary D. De Barry | 52 | Wife | — | Italy |
Pedigree Summary
John
Gen 1 · 1 parents
~0.92
Max depth 4 (1900–1950 window)
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)