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Mary Duncan — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Los-Angeles-County, California

Our Model Tree links this Mary Duncan across the 1920, 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed) — first a head (b.~1862), then head of a 2-person household.

Age 78 b. ~1862 Female Head Born: Iowa Widowed

1940 Census Record Details

Census Year1940
LocationLos-Angeles-County, California
SurnameDuncan
Given NameMary M.
Relationship to HeadHead
SexF
Color / RaceWhite
Age78
Marital StatusWidowed
BirthplaceIowa
1935 Residence (City)Los Angeles
1935 Residence (County)Los Angeles
Additional Details
Class of Worker0
Highest GradeHs 4
1935 ResidenceCalifornia
Birth StateIowa
Birth CountryUnited States
Birthplace (normalized)iowa
Township / WardWest Hollywood
Est. Birth Year~1862

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.

2 people recorded at the same address in the 1940 census.

Name Relation to head Relative to Mary Age Birth yr
Dorothy Pidge Daughter — 44 ~1896
Mary Duncan Head — 78 ~1862

Census Appearances

1920
Los Angeles, …
Head, age 57
Los Angeles, California · implied b. ~1863
●  Primary link · ~Confirmed · 1 source
XGBoost
Surname Duncan
Given Name Mary M
Relationship to Head Head
Sex F
Color / Race White
Age 57
Marital Status Widowed
Birthplace Iowa
Father's Birthplace Indiana
Mother's Birthplace Indiana
Can Read Yes
Can Write Yes
Speaks English Yes
Home Owned/Rented O
Home Free/Mortgaged M
Birth State Iowa
Birth Country United States
Birthplace (normalized) iowa
1930
Los Angeles, …
Head, age 68
Los Angeles, California · implied b. ~1862 — 3 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Duncan
Given Name Mary M.
Relationship to Head Head
Sex F
Color / Race White
Age 68
Marital Status Widowed
Birthplace Iowa
Father's Birthplace Indiana
Mother's Birthplace Indiana
Occupation none
Can Read/Write Yes
Home Owned/Rented O
Home Value / Rent 6500
Radio Set R
Birth State Iowa
Birth Country United States
Birthplace (normalized) iowa
1940
Los-Angeles-County, California
Head, age 78
Los-Angeles-County, California · implied b. ~1862 — 2 household members
Surname Duncan
Given Name Mary M.
Relationship to Head Head
Sex F
Color / Race White
Age 78
Marital Status Widowed
Birthplace Iowa
1935 Residence (City) Los Angeles
1935 Residence (County) Los Angeles
Class of Worker 0
Highest Grade Hs 4
1935 Residence California
Birth State Iowa
Birth Country United States
Birthplace (normalized) iowa

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.
Linked across censuses
Our Model Tree links Mary Duncan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Duncan
Head · 1940 · age 78 · b. ~1862 · 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 — Los-Angeles-County, California Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-00222-00467)

Line Name Age Relation Occupation Birthplace
1 Lillian Manuel 57 Head — Russia
2 Isadore Goren 55 Head Tailor Roumania
3 Pauline Goren 47 Wife Seamstress Roumania
4 Hattie Olson 60 Head Manager Minnesota
5 Ralph Olson 27 Son Welder Washington
6 Charles Root 33 Head Houseman Ohio
7 June Root 30 Wife — Illinois
8 Clarence Flint 66 Head Practitioner California
9 Nan Flint 48 Wife Vocal Music Teacher Scotland
10 Annie Kellie 76 Head — Ohio
11 Irene P. Kellie 46 Wife Secretary Minnesota
12 Warren Wilson 74 Head Director New Hampshire
13 Lucy Wilson 74 Wife — Massachusetts
14 Anna Wasserman 51 Head — New York
15 Howard Wasserman 21 Son Department Head - Salesman New York
16 Ernest Lewis 48 Head Investment Dealer South Dakota
17 Virginia Lewis 38 Wife — Illinois
18 Emanuel Lowenfeld 59 Head Corporation Executive Hungary
19 Mildred Lowenfeld 50 Wife Corporation Secretary Ohio
20 Florence Kessler 66 Head — Wisconsin
21 Helen Brautigan 39 Daughter — Colorado
22 Already Enumerated Anderson None Head — —
23 — None — — —
24 Charles Cramer 50 Head Director New York
25 Bonnie Cramer 44 Wife — Illinois
26 Charles Cramer 16 Son — Illinois
27 Wallace Eckenrode 39 Head New Business Representative Maryland
28 Marie Eckenrode 40 Wife — New York
29 George B. Burton 75 Head — Michigan
30 Marion B. Lott 47 Head — Wisconsin
31 Helen M. Lott 66 Daughter — Illinois
32 Agnes K. Birdsall 63 Daughter — Michigan
33 Mary M. Duncan THIS PERSON 78 Head — Iowa
34 Dorothy Pidge 44 Daughter Assistant Editor California
35 Alice Nelson 82 Head — Indiana
36 Frances Miller 44 Servant Maid Illinois
37 Helen Lewis 40 Head Film Editor Canada-English
38 Martha E. Mccaulley 89 Head — Delaware
39 Janet (Ab) Graham 52 Partner — New York
40 Dorothy York 53 Head — Illinois

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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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