RD
Robert Duncan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Pondera, Montana
Our Model Tree links this Robert Duncan across the 1920 and 1930 US Censuses in Pondera, Montana (XGBoost, ~Confirmed) — first a son (b.~1918), then head of a 10-person household.
Age 12
b. ~1918
Male
Son
Born: Montana
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Pondera, Montana |
| Surname | Duncan |
| Given Name | Robert G |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Township / Ward | Coalridge School District 76 |
| Est. Birth Year | ~1918 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| David Duncan | Son | — | 8 | ~1922 |
| Robert Duncan | Son | — | 12 | ~1918 |
| William Duncan | Son | — | 17 | ~1913 |
| Dwight Duncan | Son | — | 14 | ~1916 |
| Lois Duncan | Daughter | — | 16 | ~1914 |
| Clara Duncan | Spouse | — | 48 | ~1882 |
| Eugene Farr | Other | — | 24 | ~1906 |
| Alice Duncan | Daughter | — | 10 | ~1920 |
| June Duncan | Daughter | — | 5 | ~1925 |
| Jean Lockwood | Daughter | — | 2 | ~1928 |
Census Appearances
1920
Pondera, Montana
Son, age 2
Pondera, Montana · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Robert O. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Illinois |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1930
Pondera, Montana
Son, age 12
Pondera, Montana · implied b. ~1918 — 10 household members
| Surname | Duncan |
| Given Name | Robert G |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
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 2 US Census years (1920 and 1930) in Pondera, Montana, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Duncan
Son · 1930 · age 12 · b. ~1918 · Montana
★ You are viewing this record
Sibling
Alice Duncan
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Duncan
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lois Duncan
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jean Lockwood
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dwight Duncan
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Duncan
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
June Duncan
Sibling · 1930 · age 5
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 — Pondera, Montana
Open full size
1930 US Federal Census — Pondera, Montana
Page Contents
22 people indexed on this census page (ia:1930:15thcensus1260unit:0387)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jean E Lockwood | 2 | daughter | None | Montana |
| 3 | Clara M Duncan | 48 | wife | None | Illinois |
| 4 | William J Duncan | 17 | son | None | Iowa |
| 5 | Lois E Duncan | 16 | daughter | None | Iowa |
| 6 | Dwight A Duncan | 14 | son | None | Iowa |
| 7 | Robert G Duncan THIS PERSON | 12 | son | None | Montana |
| 8 | Alice L Duncan | 10 | daughter | None | Montana |
| 9 | David G Duncan | 8 | son | None | Montana |
| 10 | June E Duncan | 5 | daughter | None | Montana |
| 11 | Eugene H Farr | 24 | help | Laborer | Kentucky |
| 12 | Jesse L Watkins | 51 | head | Farmerette | Nebraska |
| 13 | William R Watkins | 28 | son | Laborer | Illinois |
| 14 | Eva M Watkins | 21 | daughter | Nurse | So Dakota |
| 15 | Jesse R Watkins | 18 | son | Laborer | Nebraska |
| 16 | Alice Watkins | 5 | daughter | None | Montana |
| 17 | Frances L Watkins | 3 | daughter | None | Montana |
| 18 | Mike J Zajonc | 21 | partner | Laborer | Nebraska |
| 19 | Jacob Schumaker | 37 | head | Farmer | Russia |
| 20 | Pauline Schumaker | 41 | wife | None | Russia |
| 21 | Catherine Musner | 14 | daughter | None | No Dakota |
| 22 | Martha Musner | 13 | daughter | None | No Dakota |
| 23 | Norman L Schumaker | 5 | son | None | Montana |
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)