MR
Mary Roberts — 1940 US Census Record
Model Tree available1940 United States Federal Census · Ada-County, Idaho
Our Model Tree links this Mary Roberts across the 1920, 1930 and 1940 US Censuses in Ada-County, Idaho (XGBoost, ~Confirmed), with identified parents Guy & Jack — first a daughter (b.~1919), then head of a 4-person household.
Age 21
b. ~1919
Female
Daughter
Born: Idaho
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Ada-County, Idaho |
| Surname | Roberts |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Idaho |
| 1935 Residence (City) | Ustick Precinct |
| 1935 Residence (County) | Ada |
| Additional Details | |
| Highest Grade | C 2 |
| 1935 Residence | Same House |
| Birth State | Idaho |
| Birth Country | United States |
| Birthplace (normalized) | idaho |
| Township / Ward | Ustick Precinct |
| Est. Birth Year | ~1919 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Roberts | Daughter | — | 21 | ~1919 |
| Jack Roberts | Head | — | 49 | ~1891 |
| Jack Roberts | Son | — | 17 | ~1923 |
| Ethel Roberts | Spouse | — | 49 | ~1891 |
Census Appearances
1920
Ada, Idaho
Daughter, age 1
Ada, Idaho · implied b. ~1919 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | ROBERTS |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Idaho |
| Father's Birthplace | Kansas |
| Mother's Birthplace | Idaho |
| Occupation | none |
| Birth State | Idaho |
| Birth Country | United States |
| Birthplace (normalized) | idaho |
1930
Ada, Idaho
Daughter, age 11
Ada, Idaho · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Roberts |
| Given Name | Mary L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Idaho |
| Father's Birthplace | Kansas |
| Mother's Birthplace | Idaho |
| Can Read/Write | Yes |
| Birth State | Idaho |
| Birth Country | United States |
| Birthplace (normalized) | idaho |
1940
Ada-County, Idaho
Daughter, age 21
Ada-County, Idaho · implied b. ~1919 — 4 household members
| Surname | Roberts |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Idaho |
| 1935 Residence (City) | Ustick Precinct |
| 1935 Residence (County) | Ada |
| Highest Grade | C 2 |
| 1935 Residence | Same House |
| Birth State | Idaho |
| Birth Country | United States |
| Birthplace (normalized) | idaho |
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 Mary Roberts across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Guy Roberts (~0.92 confidence) and father Jack Roberts (~0.92 confidence) and father Guy Roberts (~0.92 confidence) and mother Ethel Roberts (~0.92 confidence) and mother Ethel Roberts (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Guy Roberts
b. ~1890
Source father
● Household
· direct · ~0.92
Father
Jack Roberts
b. ~1891
Source father
● Household
· direct · ~0.92
Father
Guy Roberts
b. ~1892
Source father
● Household
· direct · ~0.92
Mother
Ethel Roberts
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Ethel Roberts
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Roberts
Daughter · 1940 · age 21 · b. ~1919 · Idaho
★ You are viewing this record
Sibling
Jack Roberts
Sibling · 1940 · age 17
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 — Ada-County, Idaho
Open full size
1940 US Federal Census — Ada-County, Idaho
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00736-00591)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Joan C. Officer | 9 | Daughter | — | Idaho |
| 2 | Donna M. Officer | 5 | Daughter | — | Montana |
| 3 | Alma A. Morris | 63 | Head | Farmer | Utah |
| 4 | Sarah A. Morris | 56 | Wife | — | New Zealand |
| 5 | Robert Morris | 17 | Son | — | Idaho |
| 6 | Whitney Morris | 11 | Son | — | Idaho |
| 7 | Margaret A. Perry | 32 | Daughter | — | Utah |
| 8 | Alma J. Smith | 58 | Head | — | Mississippi |
| 9 | Beatrice M. Smith | 38 | Daughter | School Teacher | Mississippi |
| 10 | Jasper H. Smith | 21 | Son | New Worker | Texas |
| 11 | Frank H. Smith | 18 | Son | — | Texas |
| 12 | H. Glenn Smith | 16 | Son | — | Texas |
| 13 | Nellie S. Thomason | 31 | Daughter | Sales Lady | Mississippi |
| 14 | Harriet J. Thomason | 5 | Daughter | — | Idaho |
| 15 | William D. Thrillkill | 74 | Head | Farmer | Iowa |
| 16 | Dell C. Thrillkill | 69 | Wife | — | Iowa |
| 17 | James W. Small | 49 | Head | Carpenter | Kansas |
| 18 | Ruby E. Small | 47 | Wife | — | Washington |
| 19 | Richard M. Small | 20 | Son | Radio Operator | Idaho |
| 20 | Esther M. Small | 14 | Daughter | — | Washington |
| 21 | William H. Briggs | 39 | Head | Stock Clerk | Iowa |
| 22 | Katherine C. Briggs | 35 | Wife | — | Idaho |
| 23 | Donna M. Briggs | 13 | Daughter | — | Idaho |
| 24 | Emily L. Briggs | 11 | Daughter | — | Idaho |
| 25 | Lyndell H. Briggs | 9 | Son | — | Idaho |
| 26 | Jack L. Roberts | 49 | Head | Manager | Kansas |
| 27 | Ethel M. Roberts | 49 | Wife | — | Idaho |
| 28 | Mary J. Roberts THIS PERSON | 21 | Daughter | — | Idaho |
| 29 | Jack L. Roberts | 17 | Son | Asst. Manager | Idaho |
| 30 | John O. Walter | 57 | Head | Farmer | Nebraska |
| 31 | Anna M. Walter | 44 | Wife | — | Oklahoma |
| 32 | Ruth D. Walter | 23 | Daughter | — | Idaho |
| 33 | Clella M. Thomason | 26 | Daughter | — | Idaho |
| 34 | Oris Thomason | 24 | Son | Auto Mechanic | — |
| 35 | Alice J. Howland | 79 | Head | — | Iowa |
| 36 | David W. Howland | 17 | Grand-son | — | Idaho |
| 37 | Henry J. Calhoun | 46 | Head | Farmer | Missouri |
| 38 | Virgie E. Calhoun | 46 | Wife | — | Missouri |
| 39 | Nola A. Calhoun | 15 | Daughter | — | Missouri |
| 40 | Norma L. Calhoun | 13 | Daughter | — | Missouri |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 5 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)