Mary Duffy — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Buchanan-County, Iowa

Our Model Tree links this Mary Duffy across the 1920, 1930 and 1940 US Censuses in Buchanan-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1884), then head of a 5-person household.

Age 56 b. ~1884 Female Spouse Born: Iowa Married

1940 Census Record Details

Census Year	1940
Location	Buchanan-County, Iowa
Surname	Duffy
Given Name	Mary I
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	56
Marital Status	Married
Birthplace	Iowa
1935 Residence (City)	Bobbette
Additional Details
Industry	335
Highest Grade	Hs 1
1935 Residence	Nebraska
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa
Township / Ward	Fairbank Twp
Est. Birth Year	~1884

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
Verona Duffy	Daughter	—	14	~1926
Theresa Duffy	Daughter	—	11	~1929
Thomas Duffy	Head	—	57	~1883
Mark Duffy	Son	—	18	~1922
Mary Duffy	Spouse	—	56	~1884

Census Appearances

1920

Buchanan, Iowa

Spouse, age 36

Buchanan, Iowa · implied b. ~1884 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Duffy
Given Name	Mae
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	36
Marital Status	Married
Birthplace	Iowa
Father's Birthplace	Illinois
Mother's Birthplace	New York
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1930

Buchanan, Iowa

Spouse, age 46

Buchanan, Iowa · implied b. ~1884 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Duffey
Given Name	Mae D
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	46
Marital Status	Married
Birthplace	Iowa
Age at First Marriage	22
Father's Birthplace	Illinois
Mother's Birthplace	New York
Can Read/Write	Yes
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1940

Buchanan-County, Iowa

Spouse, age 56

Buchanan-County, Iowa · implied b. ~1884 — 5 household members

Surname	Duffy
Given Name	Mary I
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	56
Marital Status	Married
Birthplace	Iowa
1935 Residence (City)	Bobbette
Industry	335
Highest Grade	Hs 1
1935 Residence	Nebraska
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

Model Tree

Linked across censuses

Our Model Tree links Mary Duffy 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 Duffy

Spouse · 1940 · age 56 · b. ~1884 · Iowa

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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 — Buchanan-County, Iowa Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01142-00639)

Line	Name	Age	Relation	Occupation	Birthplace
1	Herman Fettkether	31	Head	Trucker	Iowa
2	Mary E Fettkether	29	Wife	—	N. Dakota
3	Joseph H Fettkether	6	Son	—	Iowa
4	Clyde Foster	52	Head	Tenant	Indiana
5	Matilda A Foster	39	Wife	—	Iowa
6	Marjorie P Foster	10	Daughter	—	Iowa
7	Melvin S Foster	6	Son	—	Iowa
8	Paul G Foster	4	Son	—	Iowa
9	Martin W Foster	2	Son	—	Iowa
10	Thomas J Duffy	57	Head	—	Iowa
11	Mary I Duffy THIS PERSON	56	Wife	—	Iowa
12	Mark J Duffy	18	Son	—	Nebraska
13	Verona A Duffy	14	Daughter	—	Nebraska
14	Theresa M Duffy	11	Daughter	—	Nebraska
15	Edward W Kerns	45	Head	Renter	Iowa
16	Lydia M Kerns	42	Wife	—	Iowa
17	Albert E Kerns	11	Son	—	Iowa
18	Elgar J Corcoran	42	Head	Owner	Iowa
19	Anna L Corcoran	42	Wife	—	Iowa
20	Beverly A Corcoran	14	Daughter	—	Iowa
21	Edgar J Corcoran	7	Son	—	Iowa
22	John R Corcoran	0	Son	—	Iowa
23	Frank Pettit	18	Hired Hand	Laborer	Iowa
24	Vernon J Bonnerman	35	Head	Renter	Iowa
25	Helena A Bonnerman	32	Wife	—	Iowa
26	Warren V Bonnerman	8	Son	—	Iowa
27	Roberta A Bonnerman	5	Daughter	—	Iowa
28	Maureen H Bonnerman	2	Daughter	—	Iowa
29	Wayne R Bonnerman	1	Son	—	Iowa
30	Robert L Singer	52	Head	Gardener	Iowa
31	Alice H Singer	52	Wife	—	S. Dakota
32	Aris L Singer	11	Daughter	—	Iowa
33	Thomas H Pleis	67	Head	Owner	Germany
34	Tracy Pleis	55	Wife	—	Iowa
35	Thomas Jr Pleis	23	Son	—	Iowa
36	Ethalene A Pleis	20	Daughter	—	Iowa
37	Maedene A Pleis	18	Daughter	—	Iowa
38	Jacob Pleis	16	Son	—	Iowa
39	John E Pleis	14	Son	—	Iowa
40	Delbert Haberkamp	39	Head	Owner	Iowa

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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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