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Harry Mason — 1940 US Census Record
Model Tree available1940 United States Federal Census · Madison-County, Illinois
Our Model Tree links this Harry Mason across the 1920, 1930 and 1940 US Censuses in Madison-County, Illinois (XGBoost, ~Confirmed), with identified parents Harvey & Ida — first a head (b.~1902), then head of a 4-person household.
Age 38
b. ~1902
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Madison-County, Illinois |
| Surname | Mason |
| Given Name | Harry |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Alton City |
| 1935 Residence (County) | Madison |
| Additional Details | |
| Occupation | Laborer |
| Industry | Mill Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 192 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Laborer |
| Township / Ward | Alton City |
| Est. Birth Year | ~1902 |
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 Harry | Age | Birth yr |
|---|---|---|---|---|
| Robert Mason | Son | — | 5 | ~1935 |
| Helen Mason | Spouse | — | 32 | ~1908 |
| Harry Mason | Head | — | 38 | ~1902 |
| William Mason | Son | — | 9 | ~1931 |
Census Appearances
1920
Madison, Illinois
Son, age 14
Madison, Illinois · implied b. ~1906 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Harry G. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Madison, Illinois
Son, age 23
Madison, Illinois · implied b. ~1907 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Harry D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Packer |
| Industry | Flour Mill |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Madison-County, Illinois
Head, age 38
Madison-County, Illinois · implied b. ~1902 — 4 household members
| Surname | Mason |
| Given Name | Harry |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Alton City |
| 1935 Residence (County) | Madison |
| Occupation | Laborer |
| Industry | Mill Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 192 |
| Highest Grade | Hs 4 |
| 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 Harvey Mason (~0.92 confidence) and mother Ida Mason (~0.92 confidence) and mother Ida Mason (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Harvey Mason
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Ida Mason
b. ~1881
Source mother
● Household
· direct · ~0.92
Mother
Ida Mason
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harry Mason
Head · 1940 · age 38 · b. ~1902 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Madison-County, Illinois
Open full size
1940 US Federal Census — Madison-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00848-00201)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Nellie Walters | 75 | Head | — | Illinois |
| 2 | Martin Decker | 59 | Head | Fireman | Illinois |
| 3 | Helen Case | 42 | Head | — | Michigan |
| 4 | Loyal Case | 17 | Son | — | Michigan |
| 5 | Warren Case | 16 | Son | — | Michigan |
| 6 | Junior Case | 14 | Son | — | Michigan |
| 7 | Paul Kokos | 45 | Head | Laborer | Austria |
| 8 | Mary Kokos | 39 | Wife | — | Austria |
| 9 | Kenneth Kokos | 16 | Son | — | Illinois |
| 10 | Helen Kokos | 14 | Daughter | — | Illinois |
| 11 | Marie Kokos | 10 | Daughter | — | Illinois |
| 12 | Mary Kokos | 67 | Mother | — | Austria |
| 13 | Harlan Duncan | 37 | Head | Laborer | Missouri |
| 14 | Vern May Burney | 38 | Lodger | Seamstress | Kentucky |
| 15 | William Welling | 23 | Lodger | Laborer | Missouri |
| 16 | Alice Welling | 17 | Lodger | — | Kentucky |
| 17 | Claud R Welling | 18 | Lodger | New Worker | Kentucky |
| 18 | Jerome Donenace | 78 | Head | — | Kentucky |
| 19 | Jerome Donenace | 18 | Grandson | New Worker | Illinois |
| 20 | Archie Edwards | 27 | Head | Porter | Missouri |
| 21 | Florine Edwards | 23 | Wife | — | Illinois |
| 22 | Archie Edwards | 3 | Son | — | Illinois |
| 23 | Charles Edwards | 1 | Son | — | Illinois |
| 24 | Frank Kennedy | 54 | Father in law | Wheel Brick | Illinois |
| 25 | Harry Mason THIS PERSON | 38 | Head | Laborer | Illinois |
| 26 | Helen Mason | 32 | Wife | Seamstress | Missouri |
| 27 | William Mason | 9 | Son | — | Indiana |
| 28 | Robert Mason | 5 | Son | — | Illinois |
| 29 | Lewis Goodyear | 31 | Head | Laborer | Illinois |
| 30 | Dolly Goodyear | 30 | Wife | Packer | Illinois |
| 31 | Miles Collier | 35 | Head | Laborer | Illinois |
| 32 | Olga Collier | 25 | Wife | — | Illinois |
| 33 | Delores Collier | 8 | Daughter | — | Illinois |
| 34 | Charles Collier | 5 | Son | — | Illinois |
| 35 | Walter Calvey | 47 | Head | — | Illinois |
| 36 | Mamie Calvey | 45 | Wife | — | Illinois |
| 37 | Cathleen Calvey | 25 | Daughter | Box Packer | Illinois |
| 38 | Walter Calvey | 14 | Son | Delivery Boy | Illinois |
| 39 | Betty Calvey | 19 | Daughter | New Worker | Illinois |
| 40 | Jack Calvey | 15 | Son | — | Illinois |
Pedigree Summary
Harry
Gen 1 · 3 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)