JD
James Duncan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Rock-Island-County, Illinois
Our Model Tree links this James Duncan across the 1920, 1930 and 1940 US Censuses in Rock-Island-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1859), then head of a 3-person household.
Age 81
b. ~1859
Male
Head
Born: Illinois
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Rock-Island-County, Illinois |
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 81 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | Moline City |
| 1935 Residence (County) | Rock Island |
| Additional Details | |
| Highest Grade | No 1 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Moline City |
| Est. Birth Year | ~1859 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Armilla Duncan | Daughter | — | 48 | ~1892 |
| James Duncan | Head | — | 81 | ~1859 |
| Francis Schoonover | Other | — | 20 | ~1920 |
Census Appearances
1920
Rock Island, …
Head, age 61
Rock Island, Illinois · implied b. ~1859 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Captain |
| Industry | Steam boat |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Rock Island, …
Head, age 71
Rock Island, Illinois · implied b. ~1859 — 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 | 71 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 22 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | River Pilot |
| Industry | Steamship |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 10000 |
| Radio Set | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Rock-Island-County, Illinois
Head, age 81
Rock-Island-County, Illinois · implied b. ~1859 — 3 household members
| Surname | Duncan |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 81 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | Moline City |
| 1935 Residence (County) | Rock Island |
| Highest Grade | No 1 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
James Duncan
Head · 1940 · age 81 · b. ~1859 · Illinois
★ 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 — Rock-Island-County, Illinois
Open full size
1940 US Federal Census — Rock-Island-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00875-00264)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jacque C. La Raine | 54 | Head | Chef | Illinois |
| 2 | Doris B. La Raine | 52 | Wife | Laundress | Illinois |
| 3 | Lyle J. Kramer | 23 | Lodger | Mechanical Engineer | Illinois |
| 4 | Gustav H. Moores | 45 | Lodger | Machine Operator | Germany |
| 5 | Thomas B. Gervas | 46 | Lodger | Night Manager | Illinois |
| 6 | Edna B. Smith | 69 | Head | Center For Lodgers | Iowa |
| 7 | Don G. Seitz | 76 | Boarder | Helper With Poultry | Illinois |
| 8 | Lillian M. Harlowe | 30 | Lodger | Waitress | Iowa |
| 9 | James B. Six | 73 | Lodger | Editor | Illinois |
| 10 | Virgil J. Demeyer | 74 | Lodger | Truck Driver | Illinois |
| 11 | Truman Allen | 24 | Head | Handler (Steel) | Iowa |
| 12 | Beatrice M. Allen | 23 | Wife | Saleslady | Iowa |
| 13 | Dale Jensen | 41 | Lodger | Wrestling | Iowa |
| 14 | Frank V. Dufva | 75 | Head | Master Plumber | Illinois |
| 15 | Alberta C. Dufva | 71 | Wife | — | Illinois |
| 16 | Harriet Dufva | 36 | Daughter | — | Illinois |
| 17 | Norma Ferguson | 18 | Granddaughter | Housekeeper | Illinois |
| 18 | Wm. B. Brown | 68 | Head | — | Illinois |
| 19 | May H. Brown | 67 | Wife | Housework | Illinois |
| 20 | Marie H. Brown | 41 | Daughter | Librarian Clerk | Illinois |
| 21 | James Duncan THIS PERSON | 81 | Head | — | Illinois |
| 22 | Armilla Duncan | 48 | Daughter | Secretary W.A. | Illinois |
| 23 | Francis Schoonover | 20 | Granddaughter | Housekeeper | Iowa |
| 24 | Rose J. Bennett | 58 | Head | — | Illinois |
| 25 | Frances B. Bennett | 23 | Daughter | Stenographer | Illinois |
| 26 | John Wilson | 60 | Head | Janitor | Minnesota |
| 27 | Claude B. De Jarnatt | 75 | Lodger | Kernel Restaurant | Indiana |
| 28 | Henry A. Riedman | 65 | Lodger | Common Laborer | Illinois |
| 29 | John Queen | 59 | Head | Custodian | Scotland |
| 30 | Joseph G. Smith | 51 | Head | Fireman | Illinois |
| 31 | Della C. Smith | 49 | Wife | — | Illinois |
| 32 | Harry D. Davidson | 48 | Lodger | Electrician | Illinois |
| 33 | Nels C. Freundsen | 52 | Head | Pipe Inspector | Iowa |
| 34 | Anne B. Freundsen | 52 | Wife | — | Indiana |
| 35 | Emma V. Vallaert | 80 | Mother-in-law | — | Pennsylvania |
| 36 | Edna E. Stevens | 74 | Head | — | Illinois |
| 37 | Hanna M. Gustafson | 79 | Housekeeper | Housekeeper | Sweden |
| 38 | George A. Six | 56 | Head | Master Auditor | Denmark |
| 39 | Lilly H. Six | 52 | Wife | — | Denmark |
| 40 | Alice M. Wherrett | 66 | Head | Principal | Illinois |
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)