JM
James Mason — 1940 US Census Record
Model Tree available1940 United States Federal Census · King-County, Washington
Our Model Tree links this James Mason across the 1920, 1930 and 1940 US Censuses in King-County, Washington (XGBoost, ~Confirmed), with identified parents John & Winifred — first a son (b.~1910), then head of a 3-person household.
Age 30
b. ~1910
Male
Son
Born: Washington
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | King-County, Washington |
| Surname | Mason |
| Given Name | James W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Leach City |
| 1935 Residence (County) | King |
| Additional Details | |
| Occupation | Packer |
| Industry | U.S. Government |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Occupation | Packer |
| Township / Ward | Leach City |
| Est. Birth Year | ~1910 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| John Mason | Head | — | 57 | ~1883 |
| James Mason | Son | — | 30 | ~1910 |
| Winifred Mason | Spouse | — | 51 | ~1889 |
Census Appearances
1920
King, Washington
Son, age 9
King, Washington · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | James W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1930
King, Washington
Son, age 19
King, Washington · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | James W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Truck Driver |
| Industry | Grocery Store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
King-County, Washington
Son, age 30
King-County, Washington · implied b. ~1910 — 3 household members
| Surname | Mason |
| Given Name | James W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Leach City |
| 1935 Residence (County) | King |
| Occupation | Packer |
| Industry | U.S. Government |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
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 James Mason across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Mason (~0.92 confidence) and mother Winifred Mason (~0.92 confidence) and mother Winifred Mason (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Mason
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Winifred Mason
b. ~1888
Source mother
● Household
· direct · ~0.92
Mother
Winifred Mason
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Mason
Son · 1940 · age 30 · b. ~1910 · Washington
★ 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 — King-County, Washington
Open full size
1940 US Federal Census — King-County, Washington
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04381-00620)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Birney Covell | 21 | Son | Laborer | Washington |
| 42 | Willis R. Heach | Leach | 33 | Head | Painter | Washington |
| 43 | Grace Heach | Leach | 33 | Wife | Clerk | Washington |
| 44 | Carl Northern | 35 | Head | Clerk | Washington |
| 45 | Mary Northern | 35 | Wife | — | Washington |
| 46 | Patricia Northern | 2 | Daughter | — | Washington |
| 47 | William Murphy | 76 | Head | Tinsmith | Canada |
| 48 | J. D. Slane | 53 | Head | Engineer | Illinois |
| 49 | Cecil Slane | 42 | Wife | Mother | Illinois |
| 50 | Bromcamp | 25 | Nephew | Upholstering | Illinois |
| 51 | John C. Mason | 57 | Head | Painter | Scotland |
| 52 | Winifred Mason | 51 | Wife | — | Scotland |
| 53 | James W. Mason THIS PERSON | 30 | Son | Packer | Washington |
| 54 | Warner Hibberd | 30 | Head | Iron | Washington |
| 55 | Jane Hibberd | 25 | Wife | — | Washington |
| 56 | Patricia Hibberd | 6 | Daughter | — | Washington |
| 57 | Richard Hibberd | 3 | Son | — | Washington |
| 58 | Paul Hibberd | 1 | Son | — | Washington |
| 59 | Claude R. Gayson | 48 | Head | Blacksmith | New York |
| 60 | Lillian M. Gayson | 40 | Wife | — | Canada |
| 61 | James Lundberg | 27 | Head | Riveter | Oregon |
| 62 | Roberta Lundberg | 30 | Wife | — | Washington |
| 63 | Louise Lundberg | 5 | Daughter | — | Washington |
| 64 | Jesse H. Griffin | 62 | Head | Foreman | Illinois |
| 65 | Margaret Griffin | 62 | Wife | — | Colorado |
| 66 | James Amos Cummings | 32 | Head | Service Station | Washington |
| 67 | Emily Cummings | 30 | Wife | — | Washington |
| 68 | Mitchell Mary Lou Cummings | 5 | Daughter | — | Washington |
| 69 | William Arthur | 64 | Head | Manager | Pennsylvania |
| 70 | Cora Arthur | 51 | Wife | — | West Virginia |
| 71 | Ralph Lellew | 45 | Head | Fireman | Montana |
| 72 | Alda Lellew | 40 | Wife | — | Austria |
| 73 | Mina Lellew | 19 | Daughter | House Maid | Washington |
| 74 | Bernie L. Mcbride | 48 | Head | Cook | Nebraska |
| 75 | Elizabeth Matson | 73 | Mother | — | Michigan |
| 76 | Phyllis Waggoner | 47 | Roomer | Practical Nurse | Washington |
| 77 | Raymond King | 19 | Roomer | Clerk | Washington |
| 78 | Arthur Elliott | 24 | Head | Radio Operator | Washington |
| 79 | Margaret Elliott | 22 | Wife | — | Oregon |
| 80 | Sharon Elliott | 1 | Daughter | — | Washington |
Pedigree Summary
James
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)