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Mary Williamson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Alameda-County, California
Our Model Tree links this Mary Williamson across the 1920, 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed) — first a head (b.~1871), then head of a 4-person household.
Age 69
b. ~1871
Female
Head
Born: Michigan
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | Williamson |
| Given Name | Mary Jane |
| Relationship to Head | head |
| Sex | F |
| Color / Race | White |
| Age | 69 |
| Marital Status | Widowed |
| Birthplace | Michigan |
| 1935 Residence (City) | Berkeley |
| 1935 Residence (County) | Alameda |
| Additional Details | |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Township / Ward | Berkeley |
| Est. Birth Year | ~1871 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Lula Hanshaw | Daughter | — | 32 | ~1908 |
| Mary Williamson | Head | — | 69 | ~1871 |
| Guy Hanshaw | Other | — | 38 | ~1902 |
| Lester Williamson | Son | — | 45 | ~1895 |
Census Appearances
1920
Alameda, California
Head, age 49
Alameda, California · implied b. ~1871 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williamson |
| Given Name | Mary J |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Widowed |
| Birthplace | Michigan |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1930
Alameda, California
Head, age 59
Alameda, California · implied b. ~1871 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williamson |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 59 |
| Marital Status | Widowed |
| Birthplace | Michigan |
| Age at First Marriage | 21 |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 2000 |
| Radio Set | R |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Alameda-County, California
Head, age 69
Alameda-County, California · implied b. ~1871 — 4 household members
| Surname | Williamson |
| Given Name | Mary Jane |
| Relationship to Head | head |
| Sex | F |
| Color / Race | White |
| Age | 69 |
| Marital Status | Widowed |
| Birthplace | Michigan |
| 1935 Residence (City) | Berkeley |
| 1935 Residence (County) | Alameda |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 Mary Williamson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Williamson
Head · 1940 · age 69 · b. ~1871 · California
★ 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 — Alameda-County, California
Open full size
1940 US Federal Census — Alameda-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00187-00315)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Carl O. Lund | 50 | head | Machinist | Denmark |
| 2 | Susie Lund | 53 | wife | — | Arkansas |
| 3 | Philip S. Mcguire | 75 | head | — | Massachusetts |
| 4 | Jane S. Cowan | 56 | head | — | England |
| 5 | Dorothy Cowan | 17 | daughter | — | California |
| 6 | Nicholas S. Kivi | 51 | head | Painter | Russia |
| 7 | Josephine Kivi | 48 | wife | Housemaid | Finland |
| 8 | Elsie Mae Kivi | 21 | daughter | Filing | California |
| 9 | Henry Milton Burdick | 73 | head | — | California |
| 10 | Vernon D. Clark | 52 | head | Machinist | Ireland |
| 11 | William Thomas | 31 | head | Mechanic | California |
| 12 | Catherine Thomas | 26 | wife | — | California |
| 13 | Carol Thomas | 3 | daughter | — | California |
| 14 | William James Thomas | 1 | son | — | California |
| 15 | Franklin D. Fisher | 37 | head | Professor | Pennsylvania |
| 16 | Gladys R. Fisher | 41 | wife | — | Nebraska |
| 17 | Rex D. Irish | 49 | head | Dental Machinist | Michigan |
| 18 | Mae O. Irish | 35 | wife | — | Minnesota |
| 19 | Constance Irish | 11 | daughter | — | California |
| 20 | Norma Lee Irish | 9 | daughter | — | California |
| 21 | Mary E. S. Burns | 74 | head | — | Missouri |
| 22 | Ethel Ferris Burns | 50 | daughter | Power Sewing | California |
| 23 | Mary Jane Williamson THIS PERSON | 69 | head | — | Michigan |
| 24 | Lester L. Williamson | 45 | son | Secretary | California |
| 25 | Guy Hanshaw | 38 | son-in-law | Refrig. Service | Missouri |
| 26 | Lula S. Hanshaw | 32 | daughter | — | California |
| 27 | Jack S. Andrews | 36 | head | Door Installer | Kentucky |
| 28 | Blanche Andrews | 27 | wife | — | California |
| 29 | Franklin Andrews | 3 | son | — | California |
| 30 | Edward Drew | 38 | head | Tile Setter | California |
| 31 | Goldie R. Drew | 37 | wife | — | Ohio |
| 32 | Methe M. Wagner | 65 | head | Saleslady | California |
| 33 | Marie S. Thompson | 28 | head | Secretarial | California |
| 34 | William Thompson | 19 | brother | Apprentice | California |
| 35 | Lillian S. Fernley | 27 | head | Seamstress | California |
| 36 | — | None | — | — | — |
| 37 | George S. Hein | 56 | head | Truck Driver | Arkansas |
| 38 | Elizabeth Hein | 54 | wife | — | Arkansas |
| 39 | Howard Hein | 16 | son | — | Arkansas |
| 40 | Edward C. King | 34 | head | Salesman | 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)