Mary Peters — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Alameda-County, California

Our Model Tree links this Mary Peters across the 1920, 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed) — first a head (b.~1880), then head of a 4-person household.

Age 60 b. ~1880 Female Head Born: Portugal Widowed

1940 Census Record Details

Census Year	1940
Location	Alameda-County, California
Surname	Peters
Given Name	Mary O
Relationship to Head	Head
Sex	F
Color / Race	White
Age	60
Marital Status	Widowed
Birthplace	Portugal
1935 Residence (City)	Livermore City
1935 Residence (County)	Alameda
Naturalization Status	Naturalized
Additional Details
Highest Grade	No 8
1935 Residence	Same place
Birth Country	Portugal
Birthplace (normalized)	portugal
Township / Ward	Livermore City
Est. Birth Year	~1880

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
Ellen Peters	Daughter	—	23	~1917
Mary Peters	Head	—	60	~1880
William Peters	Son	—	26	~1914
Anthony Peters	Son	—	21	~1919

Census Appearances

1920

Alameda, California

Head, age 41

Alameda, California · implied b. ~1879 — 7 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Peters
Given Name	Marie
Relationship to Head	Head
Sex	F
Color / Race	White
Age	41
Marital Status	Widowed
Birthplace	Portugal
Year of Immigration	1904
Naturalization Status	Alien
Father's Birthplace	Portugal
Mother's Birthplace	Portugal
Can Read	No
Can Write	No
Speaks English	No
Mother Tongue	Portuguese
Home Owned/Rented	O
Home Free/Mortgaged	F
Birth Country	Portugal
Birthplace (normalized)	portugal

1930

Alameda, California

Head, age 52

Alameda, California · implied b. ~1878 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Peters
Given Name	Mary
Relationship to Head	Head
Sex	F
Color / Race	White
Age	52
Marital Status	Widowed
Birthplace	Portugal
Naturalization Status	Alien
Year of Immigration	1904
Father's Birthplace	Portugal
Mother's Birthplace	Portugal
Can Read/Write	Yes
Mother Tongue	Portuguese
Home Owned/Rented	O
Home Value / Rent	500
Birth Country	Portugal
Birthplace (normalized)	portugal

1940

Alameda-County, California

Head, age 60

Alameda-County, California · implied b. ~1880 — 4 household members

Surname	Peters
Given Name	Mary O
Relationship to Head	Head
Sex	F
Color / Race	White
Age	60
Marital Status	Widowed
Birthplace	Portugal
1935 Residence (City)	Livermore City
1935 Residence (County)	Alameda
Naturalization Status	Naturalized
Highest Grade	No 8
1935 Residence	Same place
Birth Country	Portugal
Birthplace (normalized)	portugal

Model Tree

Linked across censuses

Our Model Tree links Mary Peters 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 Peters

Head · 1940 · age 60 · b. ~1880 · California

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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

Page Contents

31 people indexed on this census page (nara:1940:m-t0627-00186-00018)

Line	Name	Age	Relation	Occupation	Birthplace
1	Constance Mederas	10	daughter	—	California
2	August Mederas	15	son	—	California
3	Mary O Peters THIS PERSON	60	Head	—	Portugal
4	William Peters	26	son	Laborer	California
5	Ellen Peters	23	daughter	Laundress	California
6	Anthony Peters	21	son	Laborer	California
8	Frank A Worden	62	Head	Disabled Vet	Iowa
9	Gregg Selden Worden	51	Boarder	Disabled Vet	Arkansas
12	Hallie R Mcdougal	35	Head	Painter	Michigan
13	Melly Mcdougal	31	wife	—	Nebraska
14	Verna Mcdougal	13	daughter	—	Nebraska
15	Merton Davis	31	Guest	Painter	Nebraska
16	Isabella Breen	68	Head	—	Pennsylvania
18	Evangelina Pena	66	Head	—	Colombia S. Am
19	Rubin Pena	28	son	Laborer	California
20	Matt Matson	51	Head	Laborer	California
21	Etta Matson	45	wife	—	California
26	Mary Marsh	68	Head	—	California
27	George Marsh	11	Granddaughter	—	California
28	Frank Duley	46	Head	—	Missouri
29	Josephine Duley	43	wife	—	Switzerland
30	Jack Duley	11	son	—	California
31	Jim Duley	9	son	—	California
32	Bob Duley	8	son	—	California
33	Mary Duley	7	daughter	—	California
35	Loyd Mcconner	29	Head	Laborer	Missouri
36	Wanda Mcconner	30	wife	—	Missouri
37	Dixie Mcconner	9	daughter	—	Missouri
38	Patsy Mcconner	6	daughter	—	Missouri
39	Amelia Robinson	62	Head	—	California
40	Harry Robinson	32	son	—	California

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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)

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