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Harry Mason — 1940 US Census Record
Model Tree available1940 United States Federal Census · Lake-County, Illinois
Our Model Tree links this Harry Mason across the 1920, 1930 and 1940 US Censuses in Lake-County, Illinois (XGBoost, ~Confirmed), with identified parents Cash & Cyrus — first a son (b.~1914), then head of a 5-person household.
Age 26
b. ~1914
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lake-County, Illinois |
| Surname | Mason |
| Given Name | Harry |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (County) | Lake |
| Additional Details | |
| Occupation | Asbestos |
| Industry | PW |
| Class of Worker | 1200 |
| Highest Grade | Hs 4 |
| 1935 Residence | 48 |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Asbestos |
| Township / Ward | Vernon Tp |
| Est. Birth Year | ~1914 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harry | Age | Birth yr |
|---|---|---|---|---|
| Cash Mason | Head | — | 70 | ~1870 |
| Vernon Mason | Daughter | — | 22 | ~1918 |
| Anna Mason | Spouse | — | 61 | ~1879 |
| Harry Mason | Son | — | 26 | ~1914 |
| Allen Mason | Daughter | — | 25 | ~1915 |
Census Appearances
1920
Lake, Illinois
Son, age 6
Lake, Illinois · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Harry J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | England |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Lake, Illinois
Son, age 16
Lake, Illinois · implied b. ~1914 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Harry J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | England |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Lake-County, Illinois
Son, age 26
Lake-County, Illinois · implied b. ~1914 — 5 household members
| Surname | Mason |
| Given Name | Harry |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (County) | Lake |
| Occupation | Asbestos |
| Industry | PW |
| Class of Worker | 1200 |
| Highest Grade | Hs 4 |
| 1935 Residence | 48 |
| 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 Cash Mason (~0.92 confidence) and father Cyrus Mason (~0.92 confidence) and mother Anna Mason (~0.92 confidence) and mother Emma Mason (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Cash Mason
b. ~1870
Source father
● Household
· direct · ~0.92
Father
Cyrus Mason
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Anna Mason
b. ~1879
Source mother
● Household
· direct · ~0.92
Mother
Emma Mason
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harry Mason
Son · 1940 · age 26 · b. ~1914 · Illinois
★ You are viewing this record
Sibling
Vernon Mason
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Allen Mason
Sibling · 1940 · age 25
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 — Lake-County, Illinois
Open full size
1940 US Federal Census — Lake-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00830-00385)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Louise Holst | 3 | daughter | — | Illinois |
| 2 | Nancy Holst | 0 | daughter | — | Illinois |
| 3 | Edward Alten | 33 | Head | Farmer | Illinois |
| 4 | Anna Alten | 34 | wife | H | Illinois |
| 5 | Anna May Alten | 6 | daughter | — | Illinois |
| 6 | Joseph Alten | 4 | son | — | Illinois |
| 7 | Martha Alten | 2 | daughter | — | Illinois |
| 8 | Emma Mills | 69 | Head | S | Illinois |
| 9 | George Heinsohn | 44 | Head | Farm | Illinois |
| 10 | Jenny M. Heinsohn | 40 | wife | S | Ireland |
| 11 | Anna Mae Heinsohn | 15 | daughter | — | Wisconsin |
| 12 | John Jay Heinsohn | 13 | son | — | Illinois |
| 13 | James W. Heinsohn | 10 | son | — | Illinois |
| 14 | Betty Lou Heinsohn | 8 | daughter | — | Illinois |
| 15 | Joseph Mosior | 61 | Head | Road Building | Poland |
| 16 | Mary Mosior | 57 | wife | S | Poland |
| 17 | Peter Mosior | 33 | son | U | Poland |
| 18 | Katie Kaoul | 85 | mother in law | U | Poland |
| 19 | Agnes Wilzin | 47 | Head | S | Poland |
| 20 | Stanley Wilzin | 21 | son | Farm | Illinois |
| 21 | Edward Wilzin | 20 | son | Farm | Illinois |
| 22 | Anton Wilzin | 17 | son | Farm | Illinois |
| 23 | Margaret Wilzin | 15 | daughter | — | Illinois |
| 24 | Joseph Wilzin | 14 | son | — | Illinois |
| 25 | Peter Wilzin | 13 | son | — | Illinois |
| 26 | Chester Wilzin | 8 | son | — | Illinois |
| 27 | William Poulton | 35 | Head | Farm | Illinois |
| 28 | Mildred Poulton | 25 | wife | S | Illinois |
| 29 | Norman Poulton | 5 | son | — | Illinois |
| 30 | Betty Ann Poulton | 1 | daughter | — | Illinois |
| 31 | Thadeus Ramsey | 40 | Head | Government | Maine |
| 32 | Florence Ramsey | 40 | wife | H | Illinois |
| 33 | Marian Ramsey | 16 | daughter | — | Illinois |
| 34 | Frank Ondo | 10 | step son | — | Illinois |
| 35 | Cash Jud Mason | 70 | Head | Farm | Illinois |
| 36 | Anna Mason | 61 | wife | S | England |
| 37 | Harry Mason THIS PERSON | 26 | son | Asbestos | Illinois |
| 38 | Allen M. Mason | 25 | daughter | Shirt Factory | Illinois |
| 39 | Vernon Mason | 22 | daughter | Nursery | Illinois |
| 40 | Charlton D. Nicholson | 27 | Head | Laborer | Wisconsin |
Pedigree Summary
Harry + 2 siblings
Gen 1 · 4 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)