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Harry Mason — 1940 US Census Record
Model Tree available1940 United States Federal Census · Will-County, Illinois
Our Model Tree links this Harry Mason across the 1920, 1930 and 1940 US Censuses in Will-County, Illinois (XGBoost, ~Confirmed), with identified parents George & Martin — first a son (b.~1908), then head of a 6-person household.
Age 32
b. ~1908
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Will-County, Illinois |
| Surname | Mason |
| Given Name | Harry |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Joliet City |
| 1935 Residence (County) | Will |
| Additional Details | |
| Occupation | yard clerk |
| Industry | railroad |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1000 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Yard Clerk |
| Township / Ward | Joliet City |
| Est. Birth Year | ~1908 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harry | Age | Birth yr |
|---|---|---|---|---|
| Mae Carney | Other | — | 32 | ~1908 |
| Martin Mason | Son | — | 22 | ~1918 |
| Martin Mason | Head | — | 53 | ~1887 |
| Alice Mason | Spouse | — | 50 | ~1890 |
| Violet Mason | Daughter | — | 30 | ~1910 |
| Harry Mason | Son | — | 32 | ~1908 |
Census Appearances
1920
Will, Illinois
Son, age 10
Will, Illinois · implied b. ~1910 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Harold M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Will, Illinois
Son, age 21
Will, Illinois · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Roller-maker |
| Industry | Steel-mill |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Will-County, Illinois
Son, age 32
Will-County, Illinois · implied b. ~1908 — 6 household members
| Surname | Mason |
| Given Name | Harry |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Joliet City |
| 1935 Residence (County) | Will |
| Occupation | yard clerk |
| Industry | railroad |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1000 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| 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 Harry Mason across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father George Mason (~0.92 confidence) and father Martin Mason (~0.92 confidence) and mother Alice Mason (~0.92 confidence) and mother Mary Mason (~0.92 confidence) and mother Mary Mason (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
George Mason
b. ~1878
Source father
● Household
· direct · ~0.92
Father
Martin Mason
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Alice Mason
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Mary Mason
b. ~1881
Source mother
● Household
· direct · ~0.92
Mother
Mary Mason
b. ~1891
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harry Mason
Son · 1940 · age 32 · b. ~1908 · Illinois
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Sibling
Violet Mason
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martin Mason
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 — Will-County, Illinois
Open full size
1940 US Federal Census — Will-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00907-00946)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John T Brown | 25 | Head | Painter | Illinois |
| 42 | Dorothy M Brown | 20 | Wife | Teacher | Illinois |
| 43 | Betty M Seever | 15 | Daughter | None | Illinois |
| 44 | Bessie L Smith | 17 | Roomer | None | Illinois |
| 45 | Lyle Bafra | None | — | — | — |
| 46 | Lyle Bafra | None | — | — | — |
| 47 | William P Mccallum | 28 | Head | Mill Hand | Canada |
| 48 | Anna Mccallum | 26 | Wife | None | Illinois |
| 49 | Charles E Rogers | 37 | Head | Brakeman | Illinois |
| 50 | Mabel Rogers | 37 | Wife | None | Illinois |
| 51 | Lyle Lester | None | — | — | — |
| 52 | Edward Dinga | 28 | Head | Mechanic | Illinois |
| 53 | Bernice Dinga | 26 | Wife | None | Illinois |
| 54 | James Frank | 49 | Head | Proprietor | Poland |
| 55 | Rose Frank | 49 | Wife | None | Poland |
| 56 | James W Mcdougall | 61 | Head | Teller | Illinois |
| 57 | Mae Mcdougall | 59 | Wife | None | Sweden |
| 58 | Arthur Gustafson | 41 | Head | Planer | Illinois |
| 59 | Mildred Gustafson | 32 | Wife | Supervisor | Oklahoma |
| 60 | Samuel Bullock | 35 | Head | Gas Station Attendant | Illinois |
| 61 | Margaret Bullock | 28 | Wife | None | Illinois |
| 62 | James Bullock | 2 | Son | None | Illinois |
| 63 | Lawrence Warwick | 38 | Head | Clerk | Illinois |
| 64 | Margaret Warwick | 34 | Wife | None | Tennessee |
| 65 | Martin Mason | 53 | Head | Assistant Foreman | Illinois |
| 66 | Alice Mason | 50 | Wife | None | Illinois |
| 67 | Harry Mason THIS PERSON | 32 | Son | Yard Clerk | Illinois |
| 68 | Violet Mason | 30 | Daughter | Telephone Operator | Illinois |
| 69 | Martin Jr. Mason | 22 | Son | None | Indiana |
| 70 | Mae Carney | 32 | Roomer | Telephone Operator | Illinois |
| 71 | Margaret Mckinley | 60 | Head | None | Scotland |
| 72 | Gustav Miller | 42 | Head | Salesman | Wisconsin |
| 73 | Fanny Miller | 38 | Daughter | Secretary | Illinois |
| 74 | Anthony Camier | 51 | Head | Laborer | Italy |
| 75 | Angelina Camier | 47 | Wife | None | Italy |
| 76 | Daniel Bowen | 50 | Head | Boilermaker Helper | Illinois |
| 77 | Ruth Bowen | 47 | Wife | None | Illinois |
| 78 | Raymond Bowen | 19 | Son | Elevator Operator | Illinois |
| 79 | Joseph Mcdonald | 59 | Roomer | Switchman | Illinois |
| 80 | Andrew Stuart | 68 | Head | Splice Man | Illinois |
Pedigree Summary
Harry + 2 siblings
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)