Mary Duncan — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Cook-County, Illinois

Our Model Tree links this Mary Duncan across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1889), then head of a 6-person household.

Age 51 b. ~1889 Female Spouse Born: Scotland Married

1940 Census Record Details

Census Year	1940
Location	Cook-County, Illinois
Surname	Duncan
Given Name	Mary
Relationship to Head	wife
Sex	F
Color / Race	White
Age	51
Marital Status	Married
Birthplace	Scotland
1935 Residence (City)	Chicago City
1935 Residence (County)	Cook
Naturalization Status	First papers filed
Additional Details
Highest Grade	No 8
1935 Residence	Same place
Birth Country	Scotland
Birthplace (normalized)	scotland
Township / Ward	Chicago City
Est. Birth Year	~1889

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.

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

Name	Relation to head	Relative to Mary	Age	Birth yr
Elizabeth Lynch	Daughter	—	1	~1939
Percy Duncan	Head	—	53	~1887
William Cunningham	Other	—	50	~1890
John Lynch	Son	—	28	~1912
Mary Duncan	Spouse	—	51	~1889
Margaret Lynch	Spouse	—	23	~1917

Census Appearances

1920

Cook, Illinois

Spouse, age 36

Cook, Illinois · implied b. ~1884 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Duncan
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	36
Marital Status	Married
Birthplace	Scotland
Year of Immigration	1911
Naturalization Status	Naturalized
Father's Birthplace	Scotland
Mother's Birthplace	Scotland
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	English
Birth Country	Scotland
Birthplace (normalized)	scotland

1930

Cook, Illinois

Other, age 45

Cook, Illinois · implied b. ~1885 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Duncan
Given Name	Mary G.
Relationship to Head	Wife-H
Sex	F
Color / Race	White
Age	45
Marital Status	Married
Birthplace	Scotland
Naturalization Status	Naturalized
Year of Immigration	1911
Age at First Marriage	26
Father's Birthplace	Scotland
Mother's Birthplace	Scotland
Occupation	none
Can Read/Write	Yes
Mother Tongue	English
Birth Country	Scotland
Birthplace (normalized)	scotland

1940

Cook-County, Illinois

Spouse, age 51

Cook-County, Illinois · implied b. ~1889 — 6 household members

Surname	Duncan
Given Name	Mary
Relationship to Head	wife
Sex	F
Color / Race	White
Age	51
Marital Status	Married
Birthplace	Scotland
1935 Residence (City)	Chicago City
1935 Residence (County)	Cook
Naturalization Status	First papers filed
Highest Grade	No 8
1935 Residence	Same place
Birth Country	Scotland
Birthplace (normalized)	scotland

Model Tree

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.

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This person

Anchor record

Mary Duncan

Spouse · 1940 · age 51 · b. ~1889 · Illinois

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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 — Cook-County, Illinois Open full size

Page Contents

39 people indexed on this census page (nara:1940:m-t0627-00940-00319)

Line	Name	Age	Relation	Occupation	Birthplace
41	Peter Panetta	48	head	Baker	Italy
42	Caroline Panetta	43	wife	Clerk	Italy
43	Lea Panetta	21	daughter	—	Illinois
44	Gloria Panetta	12	daughter	—	Illinois
45	Amedeo Abatiferro	76	lodger	—	Italy
46	John Cravotto	40	lodger	Baker	Italy
47	Mary Vallero	68	lodger	—	Italy
48	Margaret Vallero	30	lodger	Seamstress	Illinois
49	Charles Vallero	34	lodger	Shipping Clerk	Indiana
50	Martin Jr. Cooney	67	head	Undertaker	Illinois
51	Dorothy Cooney	24	daughter	Stenographer	Illinois
52	Mary Cooney	22	daughter	—	Illinois
53	Emil Thelen	21	lodger	—	Nebraska
54	Percy Duncan	53	head	Janitor	Scotland
55	Mary Duncan THIS PERSON	51	wife	—	Scotland
56	John F. Lynch	28	son	Machinist	Illinois
57	Margaret Lynch	23	wife	Factory Worker	Scotland
58	Elizabeth Lynch	1	daughter	—	Illinois
59	William Cunningham	50	lodger	Carpenter	Holland
60	Lymon Elkerson	26	head	Operator	Missouri
61	Adeline Elkerson	23	wife	—	Illinois
62	Nadine Elkerson	2	daughter	—	Kansas City
64	Joseph Trimbanti	40	head	Peddler	Italy
65	Esther Trimbanti	36	wife	—	Italy
66	Rose Trimbanti	11	daughter	—	Illinois
67	Anthony Trimbanti	6	son	—	Illinois
68	John Trimbanti	4	son	—	Illinois
69	Bernard Rotella	44	head	Laborer	Italy
70	John Traivian	40	head	Salesman	Italy
71	Stella Traivian	35	wife	—	Poland
72	Stanley Traivian	7	son	—	Illinois
73	Marion Traivian	6	son	—	Illinois
74	Teresa Pudajiori	57	head	—	Italy
75	Angelina Pudajiori	27	daughter	Clerk	Illinois
76	Tony Dal Ponte	45	head	Laborer	Italy
77	Mary Dal Ponte	37	wife	—	Italy
78	Yolanda Dal Ponte	14	daughter	—	Illinois
79	Anne Dal Ponte	6	daughter	—	Illinois
80	Dante Dal Ponte	3	son	—	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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