WM
William Mayer — 1940 US Census Record
Model Tree available1940 United States Federal Census · King-County, Washington
Our Model Tree links this William Mayer across the 1910, 1920, 1930 and 1940 US Censuses in King-County, Washington (XGBoost, ~Confirmed), with identified parents Katherine & Joseph — first a head (b.~1901), then head of a 6-person household.
Age 39
b. ~1901
Male
Head
Born: Washington
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | King-County, Washington |
| Surname | Mayer |
| Given Name | William H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Washington |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Additional Details | |
| Occupation | Shipping Clerk |
| Industry | Commercial Importing |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 1900 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Occupation | Shipping Clerk |
| Township / Ward | Seattle City |
| Est. Birth Year | ~1901 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Mary Mayer | Spouse | — | 40 | ~1900 |
| Marie Mayer | Daughter | — | 10 | ~1930 |
| William Mayer | Head | — | 39 | ~1901 |
| Catherine Mayer | Daughter | — | 17 | ~1923 |
| William Mayer | Son | — | 15 | ~1925 |
| Catherine Mayer | Other | — | 75 | ~1865 |
Census Appearances
1910
King, Washington
Son, age 9
King, Washington · implied b. ~1901 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mayer |
| Given Name | William E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | New York |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1920
King, Washington
Son, age 18
King, Washington · implied b. ~1902 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mayer |
| Given Name | William J. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | New York |
| Occupation | ship fitter |
| Industry | ship yard |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1930
King, Washington
Head, age 29
King, Washington · implied b. ~1901 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mayer |
| Given Name | William F. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Washington |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | New York |
| Occupation | Shipping clerk |
| Industry | Coffee importing |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 2700 |
| Radio Set | R |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
King-County, Washington
Head, age 39
King-County, Washington · implied b. ~1901 — 6 household members
| Surname | Mayer |
| Given Name | William H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Washington |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Occupation | Shipping Clerk |
| Industry | Commercial Importing |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 1900 |
| Highest Grade | H 2 |
| 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 William Mayer across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Katherine Mayer (~0.92 confidence) and father Joseph Mayer (~0.92 confidence) and mother Catherine Mayer (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Katherine Mayer
b. ~1861
Source mother
● Household
· direct · ~0.92
Father
Joseph Mayer
b. ~1865
Source father
● Household
· direct · ~0.92
Mother
Catherine Mayer
b. ~1868
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Mayer
Head · 1940 · age 39 · b. ~1901 · 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-t0627-04379-00588)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Isadore Brown | 53 | Head | Manager Owner | Latvia |
| 42 | Rose Brown | 51 | Wife | — | Latvia |
| 43 | Jesse Brown | 19 | Son | — | Washington |
| 44 | William H. Mayer THIS PERSON | 39 | Head | Shipping Clerk | Washington |
| 45 | Mary R. Mayer | 40 | Wife | — | Poland |
| 46 | Catherine Mayer | 17 | Daughter | — | Washington |
| 47 | William Mayer | 15 | Son | — | Washington |
| 48 | Marie Mayer | 10 | Daughter | — | Washington |
| 49 | Catherine Mayer | 75 | Mother | — | New York |
| 50 | George Schweitzer | 40 | Head | Cook | England |
| 51 | Esther Schweitzer | 39 | Wife | — | England |
| 52 | Charlotte Schweitzer | 10 | Daughter | — | Washington |
| 53 | Ralo Shimizu | 50 | Head | General Work | Japan |
| 54 | Kito Shimizu | 37 | Wife | — | Japan |
| 55 | Catherine Shimizu | 16 | Daughter | — | Washington |
| 56 | Paul Shimizu | 15 | Son | — | Washington |
| 57 | Rizo Hagihara | 59 | Head | Janitor | Japan |
| 58 | Tokujo Hagihara | 55 | Wife | Manager | Japan |
| 59 | George Hagihara | 25 | Son | Clerk | Washington |
| 60 | Flora B. Groat | 29 | Lodger | Teacher | Missouri |
| 61 | Ben Glazer | 35 | Head | Manager | Washington |
| 62 | Rae Glazer | 31 | Wife | Stenographer | Illinois |
| 63 | Ida Fischler | 64 | Mother in law | — | Austria |
| 64 | Ralph S. Ochi | 36 | Head | Photographer | Japan |
| 65 | Naka Ochi | 58 | Mother | — | Japan |
| 66 | Sachiko Ochi | 27 | Sister | Music Teacher | Washington |
| 67 | Sumiko Ochi | 25 | Sister | Secretary | Washington |
| 68 | John J. Grose | 82 | Head | — | Canada |
| 69 | Frances L. Grose | 80 | Wife | — | Wisconsin |
| 70 | Gilbert Leiendecker | 54 | Head | Patent Attorney | Iowa |
| 71 | Gertrude Leiendecker | 54 | Wife | — | Massachusetts |
| 72 | Henry Leiendecker | 30 | Son | Passenger Agent | Washington |
| 73 | Nathan Anchee | 58 | Head | Manager | Poland |
| 74 | Libby Anchee | 55 | Wife | — | Poland |
| 75 | Tosuka Inouye | 57 | Head | Florist | Japan |
| 76 | Hisa Inouye | 53 | Wife | Florist | Japan |
| 77 | Masako Inouye | 24 | Daughter | Florist | Japan |
| 78 | Miryo Inouye | 23 | Daughter | Florist | Japan |
| 79 | Fuku Inouye | 15 | Daughter | — | Washington |
| 80 | Mito Inouye | 12 | Daughter | — | Washington |
Related Census Records
Pedigree Summary
William
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)