MP
Mary Phelps — 1940 US Census Record
Model Tree available1940 United States Federal Census · Alameda-County, California
Our Model Tree links this Mary Phelps across the 1920, 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed), with identified parents George & Lulu — first a daughter (b.~1913), then head of a 3-person household.
Age 27
b. ~1913
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | Phelps |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Oakland |
| 1935 Residence (County) | Alameda |
| Additional Details | |
| Hours Worked | 65 |
| Highest Grade | C-3 |
| 1935 Residence | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Hayward |
| Est. Birth Year | ~1913 |
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 |
|---|---|---|---|---|
| Lulu Phelps | Spouse | — | 54 | ~1886 |
| Mary Phelps | Daughter | — | 27 | ~1913 |
| George Phelps | Head | — | 57 | ~1883 |
Census Appearances
1920
Alameda, California
Daughter, age 7
Alameda, California · implied b. ~1913 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Phelps |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Alameda, California
Daughter, age 17
Alameda, California · implied b. ~1913 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Phelps |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | 18 |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Alameda-County, California
Daughter, age 27
Alameda-County, California · implied b. ~1913 — 3 household members
| Surname | Phelps |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Oakland |
| 1935 Residence (County) | Alameda |
| Hours Worked | 65 |
| Highest Grade | C-3 |
| 1935 Residence | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 Phelps across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father George Phelps (~0.92 confidence) and mother Lulu Phelps (~0.92 confidence) and father George Phelps (~0.92 confidence) and mother Lulu Phelps (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
George Phelps
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Lulu Phelps
b. ~1886
Source mother
● Household
· direct · ~0.92
Father
George Phelps
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Lulu Phelps
b. ~1887
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Phelps
Daughter · 1940 · age 27 · b. ~1913 · 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-t0627-00184-00019)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | James C. Prowas | 43 | Head | Clerk | California |
| 42 | Gloria S. Prowas | 30 | Wife | — | California |
| 43 | James L. Prowas | 16 | Son | — | California |
| 44 | Donald L. Prowas | 14 | Son | — | California |
| 45 | Bradshaw Prowas | 4 | Son | — | California |
| 46 | John B. De Murr | 34 | Head | Lineman | Michigan |
| 47 | Belma A. De Murr | 26 | Wife | — | Michigan |
| 48 | Ronald De Murr | 8 | Son | — | California |
| 49 | Faith De Murr | 2 | Daughter | — | California |
| 50 | Charles P. Thorup | 32 | Head | Accountant | California |
| 51 | Anne M. Thorup | 29 | Wife | — | Montana |
| 52 | Marilyn Thorup | 5 | Daughter | — | California |
| 53 | Harold King | 23 | Lodger | Clerk | Kansas |
| 54 | Kenneth V. Bunce | 37 | Head | Executive | California |
| 55 | Edna L. Bunce | 36 | Wife | — | California |
| 56 | Donald R. Bunce | 4 | Son | — | California |
| 57 | Kenneth H. Frye | 36 | Head | Meter Reader & Clerk | California |
| 58 | Frances M. Frye | 31 | Wife | Order Writer | Washington |
| 59 | Robert K. Frye | 9 | Son | — | California |
| 60 | Extra Line Frye | None | — | — | — |
| 61 | Elwood L. Johnson | 32 | Head | Salesman | California |
| 62 | Elizabeth Johnson | 29 | Wife | — | California |
| 63 | James Lee Johnson | 5 | Son | — | California |
| 64 | Rance A. Grinols | 40 | Head | Salesman | North Dakota |
| 65 | Helen A. Grinols | 42 | Wife | — | Minnesota |
| 66 | Rance R. Grinols | 6 | Son | — | Minnesota |
| 67 | Haydn G. Davies | 41 | Head | Science Instructor | Wales |
| 68 | Lyle A. Davies | 40 | Wife | — | California |
| 69 | Clarence C. Alkire | 43 | Head | Supervising Foreman | Iowa |
| 70 | Lucille S. Alkire | 35 | Wife | — | Missouri |
| 71 | George R. Phelps | 57 | Head | Cashier | California |
| 72 | Lulu B. Phelps | 54 | Wife | — | California |
| 73 | Mary A. Phelps THIS PERSON | 27 | Daughter | — | California |
| 74 | Joseph L. Hollingshead | 48 | Head | Superintendent | California |
| 75 | Maybelle L. Hollingshead | 47 | Wife | — | California |
| 76 | Glenn H. Clegg | 20 | Son-in-law | Field Man | Utah |
| 77 | Virginia L. Clegg | 19 | Daughter | Saleslady | California |
| 78 | Harry H. Bradford | 53 | Head | Postal Clerk | California |
| 79 | Wilhelmina Bradford | 54 | Wife | — | California |
| 80 | Mary M. Hope | 71 | Head | — | Indiana |
Pedigree Summary
Mary
Gen 1 · 4 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)