MP
Mary Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · San-Diego-County, California
Our Model Tree links this Mary Peterson across the 1920, 1930 and 1940 US Censuses in San-Diego-County, California (XGBoost, ~Confirmed), with identified parents Mary & Mary — first a daughter (b.~1915), then head of a 5-person household.
Age 25
b. ~1915
Female
Daughter
Born: Colorado
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Diego-County, California |
| Surname | Peterson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | San Diego |
| 1935 Residence (County) | San Diego |
| Additional Details | |
| Occupation | Dress Alteration |
| Industry | Dept. Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 936 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Dress Alteration |
| Township / Ward | San Diego |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Peterson | Daughter | — | 25 | ~1915 |
| John Peterson | Head | — | 54 | ~1886 |
| Hannah Anderson | Other | — | 78 | ~1862 |
| Howard Peterson | Son | — | 28 | ~1912 |
| Mary Peterson | Spouse | — | 63 | ~1877 |
Census Appearances
1920
San Diego, …
Daughter, age 6
San Diego, California · implied b. ~1914 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | May M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Kansas |
| Mother's Birthplace | Kansas |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1930
San Diego, …
Daughter, age 16
San Diego, California · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Mary M. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Kansas |
| Mother's Birthplace | Kansas |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
San-Diego-County, California
Daughter, age 25
San-Diego-County, California · implied b. ~1915 — 5 household members
| Surname | Peterson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | San Diego |
| 1935 Residence (County) | San Diego |
| Occupation | Dress Alteration |
| Industry | Dept. Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 936 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 Peterson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Peterson (~0.92 confidence) and mother Mary Peterson (~0.92 confidence) and father John Peterson (~0.92 confidence) and father John Peterson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Peterson
b. ~1877
Source mother
● Household
· direct · ~0.92
Mother
Mary Peterson
b. ~1880
Source mother
● Household
· direct · ~0.92
Father
John Peterson
b. ~1882
Source father
● Household
· direct · ~0.92
Father
John Peterson
b. ~1886
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Peterson
Daughter · 1940 · age 25 · b. ~1915 · California
★ You are viewing this record
Sibling
Howard Peterson
Sibling · 1940 · age 28
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-Diego-County, California
Open full size
1940 US Federal Census — San-Diego-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00453-00077)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary Mccabe | 23 | Wife | Housework | Virginia |
| 42 | Frank Rieser | 56 | Head | Brewer | Austria |
| 43 | Blanche Rieser | 56 | Wife | — | Austria |
| 44 | John A. Higgins | 35 | Head | Cook | Louisiana |
| 45 | John A. Peterson | 54 | Head | Finishman | Kansas |
| 46 | Mary M. Peterson | 63 | Wife | — | Kansas |
| 47 | Howard J. Peterson | 28 | Son | Coffee Taster | Colorado |
| 48 | Mary Peterson THIS PERSON | 25 | Daughter | Dress Alteration | Colorado |
| 49 | Hannah Anderson | 78 | Mother-in-law | — | Sweden |
| 50 | Willard Staff | 30 | Head | Truck Driver | California |
| 51 | Alice M. Staff | 23 | Wife | — | Minnesota |
| 52 | Herbert E. Twiss | 30 | Head | Machinist M. | Arkansas |
| 53 | James Clark | 39 | Head | Glass Worker | Tennessee |
| 54 | Rigoberto Rodriguez | 49 | Head | Taxi Driver | Mexico |
| 55 | Grace Rodriguez | 32 | Wife | Packer | Mexico |
| 56 | Rigoberto Rodriguez | 16 | Son | — | California |
| 57 | Helen Rodriguez | 14 | Daughter | — | California |
| 58 | Jean Rodriguez | 13 | Daughter | — | California |
| 59 | Blanche Rodriguez | 12 | Daughter | — | California |
| 60 | Abelardo Rodriguez | 11 | Son | — | California |
| 61 | Yolanda Rodriguez | 8 | Daughter | — | California |
| 62 | Frances Rodriguez | 5 | Daughter | — | California |
| 63 | Raymond Rodriguez | 3 | Son | — | California |
| 64 | Benito Castillo | 55 | Head | Car Repairman | Mexico |
| 65 | Vicenta Castillo | 47 | Wife | — | Mexico |
| 66 | Albert Castillo | 23 | Son | Warehouseman | California |
| 67 | Tomasita Castillo | 19 | Daughter | Packer | California |
| 68 | Manuel Castillo | 18 | Son | New Worker | California |
| 69 | Simon Castillo | 12 | Son | — | California |
| 70 | Mary Castillo | 7 | Daughter | — | California |
| 71 | David Castillo | 6 | Son | — | California |
| 72 | Beatrice Castillo | 4 | Daughter | — | California |
| 73 | Phillip E. Cramer | 68 | Head | — | California |
| 74 | Ben Hostetter | 70 | Head | Night Watchman | Louisiana |
| 75 | Emily Hostetter | 68 | Wife | — | Washington |
| 76 | Nicola Marahne | 43 | Head | Proprietor | Italy |
| 77 | Valentine M. Dennis | 31 | Head | Machinist M. | Washington |
| 78 | Doris Dennis | 28 | Wife | — | Vermont |
| 79 | Cheshina Dennis | 9 | Daughter | — | New York |
| 80 | Robert L. Dennis | 8 | Son | — | New York |
Pedigree Summary
Mary + 1 sibling
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)