RD
Robert Duncan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Multnomah-County, Oregon
Our Model Tree links this Robert Duncan across the 1920, 1930 and 1940 US Censuses in Multnomah-County, Oregon (XGBoost, ~Confirmed), with identified parents Samuel & Annie — first a son (b.~1916), then head of a 5-person household.
Age 24
b. ~1916
Male
Son
Born: Oregon
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Multnomah-County, Oregon |
| Surname | Duncan |
| Given Name | Robert O. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Oregon |
| 1935 Residence (City) | Portland City |
| 1935 Residence (County) | Multnomah |
| Additional Details | |
| Occupation | Machine inspector |
| Industry | Tin can manufacture |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1350 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
| Occupation | Machine Inspector |
| Township / Ward | Portland City |
| Est. Birth Year | ~1916 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Robert Duncan | Other | — | 1 | ~1939 |
| Robert Duncan | Son | — | 24 | ~1916 |
| Marie Duncan | Spouse | — | 48 | ~1892 |
| Orval Duncan | Head | — | 52 | ~1888 |
| Dorothy Duncan | Daughter | — | 22 | ~1918 |
Census Appearances
1920
Multnomah, Oregon
Son, age 3
Multnomah, Oregon · implied b. ~1917 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Robert E |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Oregon |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
1930
Multnomah, Oregon
Son, age 13
Multnomah, Oregon · implied b. ~1917 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Robert A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Oregon |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read/Write | Yes |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
1940
Multnomah-County, Oregon
Son, age 24
Multnomah-County, Oregon · implied b. ~1916 — 5 household members
| Surname | Duncan |
| Given Name | Robert O. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Oregon |
| 1935 Residence (City) | Portland City |
| 1935 Residence (County) | Multnomah |
| Occupation | Machine inspector |
| Industry | Tin can manufacture |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1350 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
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 Robert Duncan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Samuel Duncan (~0.92 confidence) and mother Annie Duncan (~0.92 confidence) and father Orval Duncan (~0.92 confidence) and mother Marie Duncan (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Samuel Duncan
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Annie Duncan
b. ~1885
Source mother
● Household
· direct · ~0.92
Father
Orval Duncan
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Marie Duncan
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Duncan
Son · 1940 · age 24 · b. ~1916 · Oregon
★ You are viewing this record
Sibling
Dorothy Duncan
Sibling · 1940 · age 22
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
1940 US Federal Census — Multnomah-County, Oregon
Open full size
1940 US Federal Census — Multnomah-County, Oregon
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-03394-00322)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Tom Rictor | 58 | Head | Laborer | Illinois |
| 2 | Jessie F. Rictor | 50 | Wife | — | Nebraska |
| 3 | Anna B. Fox | 27 | Daughter | New Worker | Kansas |
| 4 | Fleetwood A. Fox | 3 | Grandson | — | Oregon |
| 5 | Henry H. Hines | 54 | Head | Automobile Mechanic | Wisconsin |
| 6 | Mary W. Hines | 56 | Wife | — | Wisconsin |
| 7 | James A. Hines | 20 | Son | New Worker | Oregon |
| 8 | Henry H. Hines | 15 | Son | — | Oregon |
| 9 | Harley L. Rictor | 28 | Head | Truck Driver | Kansas |
| 10 | Dorothy M. Rictor | 22 | Wife | — | Washington |
| 11 | Samuel F. Franz | 35 | Head | Longshoreman | Oklahoma |
| 12 | Geneva A. Franz | 31 | Wife | Laborer | Washington |
| 13 | Robert L. Franz | 11 | Son | — | Oregon |
| 14 | Charles M. Franz | 9 | Son | — | Oregon |
| 15 | Frances D. A. Franz | 3 | Daughter | — | Oregon |
| 16 | Susan D. Franz | 2 | Daughter | — | Oregon |
| 17 | Orval F. Duncan | 52 | Head | Longshoreman | Oregon |
| 18 | Marie E. Duncan | 48 | Wife | Laundress | Oregon |
| 19 | Robert O. Duncan THIS PERSON | 24 | Son | Machine Inspector | Oregon |
| 20 | Dorothy K. Duncan | 22 | Daughter | Secretary | Washington |
| 21 | Robert O. Duncan | 1 | Grandson | — | Oregon |
| 22 | Carl J. Larrick | 28 | Head | Attendant | Oregon |
| 23 | Sylvia Larrick | 20 | Wife | — | South Dakota |
| 24 | Henry W. Huralbright | 45 | Head | Proprietor | New York |
| 25 | Ruby R. Huralbright | 43 | Wife | Machine Operator | Kansas |
| 26 | Virginia L. Huralbright | 19 | Daughter | Machine Operator | Oregon |
| 27 | Mark Huralbright | 15 | Son | — | Oregon |
| 28 | John F. Montag | 56 | Head | Shipping Clerk | Illinois |
| 29 | Mabel Ab Montag | 48 | Wife | — | Illinois |
| 30 | Robert P. Montag | 20 | Son | — | Illinois |
| 31 | Anita K. Montag | 17 | Daughter | — | Oregon |
| 32 | Shirley M. Montag | 14 | Daughter | — | Oregon |
| 33 | Thomas H. Montag | 13 | Son | — | Oregon |
| 34 | Mickey C. Montag | 8 | Son | — | Oregon |
| 35 | Donna L. Montag | 5 | Daughter | — | Oregon |
| 36 | Lewis B. Heitz | 32 | Head | Meat Cutter | Washington |
| 37 | Agnes B. Heitz | 39 | Wife | — | Oregon |
| 38 | Gary L. Heitz | 2 | Son | — | Oregon |
Pedigree Summary
Robert + 1 sibling
Gen 1 · 4 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)