MC
Mary Campbell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Alameda-County, California
Our Model Tree links this Mary Campbell across the 1920, 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed) — first a spouse (b.~1915), then head of a 3-person household.
Age 25
b. ~1915
Female
Spouse
Born: Oregon
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | Campbell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Oregon |
| 1935 Residence (City) | Oakland |
| 1935 Residence (County) | Alameda |
| Additional Details | |
| Occupation | Clerk |
| Industry | Telephone |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 700 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
| Occupation | Clerk |
| Township / Ward | Oakland |
| Est. Birth Year | ~1915 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Howard Campbell | Head | — | 31 | ~1909 |
| Richard Campbell | Son | — | 1 | ~1939 |
| Mary Campbell | Spouse | — | 25 | ~1915 |
Census Appearances
1920
Alameda, California
Other, age 4
Alameda, California · implied b. ~1916 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Myron |
| Relationship to Head | Grand Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Oregon |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Texas |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
1930
Alameda, California
Other, age 14
Alameda, California · implied b. ~1916 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Marjorie H. |
| Relationship to Head | Granddaughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Oregon |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Texas |
| Can Read/Write | Yes |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
1940
Alameda-County, California
Spouse, age 25
Alameda-County, California · implied b. ~1915 — 3 household members
| Surname | Campbell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Oregon |
| 1935 Residence (City) | Oakland |
| 1935 Residence (County) | Alameda |
| Occupation | Clerk |
| Industry | Telephone |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 700 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
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 Campbell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Campbell
Spouse · 1940 · age 25 · b. ~1915 · 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
39 people indexed on this census page (nara:1940:m-t0627-00433-00892)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Stanley Olsen | 4 | Head | — | California |
| 42 | Howard Thompson | 52 | Head | Foreman | Colorado |
| 43 | Elizabeth Thompson | 59 | Wife | — | Missouri |
| 44 | Howard Campbell | 31 | Head | Foreman | Virginia |
| 45 | Mary Campbell THIS PERSON | 25 | Wife | Clerk | Oregon |
| 46 | Richard Campbell | 1 | Son | — | California |
| 47 | Albert Leonhardt | 36 | Head | Mechanic | Germany |
| 48 | Josephine Leonhardt | 32 | Wife | — | Germany |
| 49 | Marguerite Roadman | 10 | Daughter | — | California |
| 50 | Elaine B. Leonhardt | 7 | Daughter | — | California |
| 51 | Elmer P. Schwang | 34 | Head | Flyer | Illinois |
| 52 | Eldra A. Schwang | 29 | Wife | — | Arkansas |
| 53 | Mary Ann Schwang | 1 | Daughter | — | California |
| 54 | Howard B. Rath | 44 | Head | Play Center | S. Dakota |
| 55 | Curtis Rath | 15 | Son | — | Oregon |
| 56 | Sarah Rath | 67 | Mother | — | Missouri |
| 57 | Frank A. Schoenmaker | 55 | Head | Clerical Deputy | Illinois |
| 58 | Wayne Schoenmaker | 51 | Wife | — | Texas |
| 59 | John W. Burton | 41 | Head | Heat Treater | England |
| 60 | Alice L. Burton | 44 | Wife | — | England |
| 61 | Tom Burton | 10 | Son | — | California |
| 62 | Kenneth A. Jackson | 27 | Head | Truck Driver | California |
| 63 | Lillian M. Jackson | 24 | Wife | — | New York |
| 64 | Kenneth Jr. Jackson | 0 | Son | — | California |
| 65 | Donald Gonzales | 22 | Head | Record Keeper | California |
| 66 | Gloria E. Gonzales | 20 | Wife | — | Utah |
| 67 | Frank Eaton | 23 | Head | Laborer | Oklahoma |
| 68 | Lidia Eaton | 23 | Wife | — | Italy |
| 69 | Herman Bojarsky | 40 | Head | Private Practice | Russia |
| 70 | Naomi Bojarsky | 30 | Wife | — | Connecticut |
| 71 | Benjamin W. Bojarsky | 5 | Son | — | California |
| 72 | Robert Finley | 40 | Head | Cashier | California |
| 73 | Alice Finley | 31 | Wife | — | California |
| 74 | Lynn Patricia Finley | 2 | Daughter | — | California |
| 75 | Albert Castro | 45 | Head | Warehouseman | California |
| 76 | Lida M. Castro | 35 | Wife | — | Colorado |
| 77 | George Perry | 32 | Head | Cabinet Maker | California |
| 78 | Mary Perry | 60 | Mother | — | Portugal |
| 79 | Boyd Piercy | 37 | Head | Clerk | 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)