RM
Robert Mason — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Robert Mason across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1889), then head of a 3-person household.
Age 51
b. ~1889
Male
Head
Born: Scotland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Mason |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Wood Patternmaker |
| Industry | Wood Mfg. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 2010 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Occupation | Wood Patternmaker |
| Township / Ward | Chicago |
| Est. Birth Year | ~1889 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Roberta Mason | Daughter | — | 23 | ~1917 |
| Robert Mason | Head | — | 51 | ~1889 |
| Jane Mason | Spouse | — | 45 | ~1895 |
Census Appearances
1920
Cook, Illinois
Head, age 31
Cook, Illinois · implied b. ~1889 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Scotland |
| Year of Immigration | 1914 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Pattern Maker |
| Industry | Harvesting |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | Scotland |
| Year of Naturalization | 1919 |
| Birthplace (normalized) | scotland |
1930
Cook, Illinois
Head, age 41
Cook, Illinois · implied b. ~1889 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1911 |
| Age at First Marriage | 24 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Pattern Maker |
| Industry | Wood |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 5000 |
| Radio Set | R |
| Veteran | No |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Cook-County, Illinois
Head, age 51
Cook-County, Illinois · implied b. ~1889 — 3 household members
| Surname | Mason |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Occupation | Wood Patternmaker |
| Industry | Wood Mfg. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 2010 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 Mason across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Mason
Head · 1940 · age 51 · b. ~1889 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00997-00605)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Clarence Duplain | 38 | Head | Conductor | Wisconsin |
| 2 | Phyllis Ann Duplain | 15 | Daughter | — | Illinois |
| 3 | Dorothy Duplain | 11 | Daughter | — | Illinois |
| 4 | Arthur Zeplin | 44 | Head | Conductor | Germany |
| 5 | Mary Zeplin | 34 | Wife | — | Illinois |
| 6 | Arthur Jr. Zeplin | 11 | Son | — | Illinois |
| 7 | June Carol Zeplin | 5 | Daughter | — | Illinois |
| 8 | Walter Dugmal | 37 | Head | Salesman | Germany |
| 9 | Dorothy Dugmal | 33 | Wife | — | Illinois |
| 10 | Walter Jr. Dugmal | 12 | Son | — | Illinois |
| 11 | Mary Jane Dugmal | 8 | Daughter | — | Illinois |
| 12 | James Dugmal | 4 | Son | — | Illinois |
| 13 | William Johnson | 60 | Head | Engineer | Illinois |
| 14 | Millie Lapel | 56 | Lodger | — | Illinois |
| 15 | Ragnar H. Lundin | 41 | Head | Clerk | Sweden |
| 16 | Daisy Lundin | 34 | Wife | — | Iowa |
| 17 | Roger Lundin | 13 | Son | — | Illinois |
| 18 | Robert Mason THIS PERSON | 51 | Head | Wood Patternmaker | Scotland |
| 19 | Jane Mason | 45 | Wife | — | Scotland |
| 20 | Roberta Mason | 23 | Daughter | Stenographer | Illinois |
| 21 | Felix Kominski | 50 | Head | Photo Engraver | Illinois |
| 22 | Lillian Kominski | 45 | Wife | — | Illinois |
| 23 | Harold Kominski | 17 | Son | — | Illinois |
| 24 | Lillian G. Kominski | 16 | Daughter | — | Illinois |
| 25 | Berta Suphe | 78 | Head | — | Germany |
| 26 | William Suphe | 58 | Son | Barn Hand | Illinois |
| 27 | Louis Suphe | 52 | Son | Rag Man | Illinois |
| 28 | Fred Suphe | 47 | Son | — | Illinois |
| 29 | James Elliott | 57 | Head | Sub Station Oper | Illinois |
| 30 | Albertina Elliott | 57 | Wife | — | Illinois |
| 31 | Ralph Elliott | 24 | Son | Clerk | Illinois |
| 32 | Nellie Elliott | 86 | Mother | — | Ireland |
| 33 | Erich Kraaf | 38 | Head | Engraver | Germany |
| 34 | Clara Kraaf | 37 | Wife | — | Germany |
| 35 | Walter Kraaf | 14 | Son | — | Illinois |
| 36 | Senta Kraaf | 2 | Daughter | — | Illinois |
| 37 | Lee Langeland | 44 | Head | Salesman | South Dakota |
| 38 | Sara Langeland | 39 | Wife | — | Iowa |
| 39 | Gordon Langeland | 16 | Son | — | South Dakota |
| 40 | Wallace Langeland | 14 | Son | — | 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)