WM
William Marsh — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Mateo-County, California
Our Model Tree links this William Marsh across the 1930 and 1940 US Censuses in San-Mateo-County, California (XGBoost, ~Confirmed) — first a son (b.~1919), then head of a 6-person household.
Age 21
b. ~1919
Male
Son
Born: Washington D.C.
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Mateo-County, California |
| Surname | Marsh |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Washington D.C. |
| 1935 Residence (City) | Burlingame City |
| 1935 Residence (County) | San Mateo |
| Additional Details | |
| Occupation | Clerk |
| Industry | Wholesale Plumbing |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 500 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | District of Columbia |
| Birth Country | United States |
| Birthplace (normalized) | washington dc |
| Occupation | Clerk |
| Township / Ward | Burlingame City |
| Est. Birth Year | ~1919 |
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 |
|---|---|---|---|---|
| William Marsh | Son | — | 21 | ~1919 |
| Anna Marsh | Spouse | — | 51 | ~1889 |
| George Marsh | Son | — | 26 | ~1914 |
| David Marsh | Head | — | 58 | ~1882 |
| Robert Marsh | Son | — | 24 | ~1916 |
| Paul Marsh | Son | — | 14 | ~1926 |
Census Appearances
1930
San Mateo, …
Son, age 11
San Mateo, California · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Marsh |
| Given Name | William H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Washington D.C. |
| Father's Birthplace | Rhode Island |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | District of Columbia |
| Birth Country | United States |
| Birthplace (normalized) | washington dc |
1940
San-Mateo-County, California
Son, age 21
San-Mateo-County, California · implied b. ~1919 — 6 household members
| Surname | Marsh |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Washington D.C. |
| 1935 Residence (City) | Burlingame City |
| 1935 Residence (County) | San Mateo |
| Occupation | Clerk |
| Industry | Wholesale Plumbing |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 500 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | District of Columbia |
| Birth Country | United States |
| Birthplace (normalized) | washington dc |
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 Marsh across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Marsh
Son · 1940 · age 21 · b. ~1919 · California
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Sibling
Paul Marsh
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Marsh
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Marsh
Sibling · 1940 · age 24
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 — San-Mateo-County, California
Open full size
1940 US Federal Census — San-Mateo-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00332-00263)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Barry E. Quinn | 54 | Head | Civil Engineer | California |
| 2 | Clara S. Quinn | 47 | Wife | — | California |
| 3 | Malcolm F. Mcnair | 38 | Head | Structural Engineer | Washington |
| 4 | Margaret Mcnair | 37 | Wife | — | Washington D.C. |
| 5 | Barbara Mcnair | 16 | Daughter | — | California |
| 6 | Ralph Rodgers | 41 | Head | Salesman | Ohio |
| 7 | Ellise Rodgers | 39 | Wife | — | Ohio |
| 8 | Robert Rodgers | 13 | Son | — | Ohio |
| 9 | Joseph Rodgers | 11 | Son | — | Ohio |
| 10 | Lloyd S. Thompson | 38 | Head | Factory Superintendent | California |
| 11 | Florence M. Thompson | 35 | Wife | — | California |
| 12 | Lloyd S. Jr. Thompson | 1 | Son | — | California |
| 13 | Harriett Allen | 55 | Head | — | Maine |
| 14 | Peter P. Sonders | 44 | Head | Lithographer | California |
| 15 | Lucille S. Sonders | 36 | Wife | — | California |
| 16 | Peter S. Jr. Sonders | 9 | Son | — | California |
| 17 | Raoul R. Moses | 65 | Head | — | Switzerland |
| 18 | Ida M. Moses | 67 | Wife | — | Ohio |
| 19 | Edward J. Dalton | 43 | Head | Manager | New York |
| 20 | Mary G. Dalton | 43 | Wife | — | New York |
| 21 | Dorothy Dalton | 23 | Daughter | Typist | New York |
| 22 | Virginia Dalton | 20 | Daughter | — | New York |
| 23 | Mary Dalton | 12 | Daughter | — | Los Angeles |
| 24 | George H. Protheroe | 46 | Head | Secretary | Wales |
| 25 | Dorothy Protheroe | 42 | Wife | — | Colorado |
| 26 | Mary Protheroe | 14 | Daughter | — | California |
| 27 | Enrich G. Cornell | 41 | Head | Salesman | South Dakota |
| 28 | Isabel Cornell | 50 | Wife | — | Scotland |
| 29 | Bernita Cornell | 17 | Daughter | — | Illinois |
| 30 | David G. Marsh | 58 | Head | Electrical Engineer | West Virginia |
| 31 | Anna C. Marsh | 51 | Wife | — | Maryland |
| 32 | George W. Marsh | 26 | Son | Civil Engineer | Pennsylvania |
| 33 | Robert Marsh | 24 | Son | Stock Clerk | Pennsylvania |
| 34 | William Marsh THIS PERSON | 21 | Son | Clerk | Washington D.C. |
| 35 | Paul Marsh | 14 | Son | — | California |
| 36 | Alexander W. Mckee | 40 | Head | Sales Manager | Massachusetts |
| 37 | Martha E. Mckee | 38 | Wife | — | Washington |
| 38 | Alexander C. Mckee | 1 | Son | — | California |
| 39 | Sachi Yaki | 22 | Maid | Maid | California |
| 40 | Delphia D. Howell | 46 | Head | Mechanical Engineer | California |
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)