Mary Henderson — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Cook-County, Illinois

Our Model Tree links this Mary Henderson across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1856), then head of a 4-person household.

Age 84 b. ~1856 Female Head Born: Sweden Widowed

1940 Census Record Details

Census Year	1940
Location	Cook-County, Illinois
Surname	Henderson
Given Name	Mary J.
Relationship to Head	Head
Sex	F
Color / Race	White
Age	84
Marital Status	Widowed
Birthplace	Sweden
1935 Residence (City)	Chicago
1935 Residence (County)	Cook
Naturalization Status	Naturalized
Additional Details
Industry	H
Class of Worker	0
Highest Grade	No 6
1935 Residence	Same House
Birth Country	Sweden
Birthplace (normalized)	sweden
Township / Ward	Chicago
Est. Birth Year	~1856

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
Helen Henderson	Daughter	—	45	~1895
Mary Henderson	Head	—	84	~1856
Henry Henderson	Son	—	58	~1882
Harry Henderson	Son	—	48	~1892

Census Appearances

1920

Cook, Illinois

Spouse, age 64

Cook, Illinois · implied b. ~1856 — 9 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Henderson
Given Name	Mary L
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	64
Marital Status	Married
Birthplace	Sweden
Year of Immigration	1879
Naturalization Status	Naturalized
Father's Birthplace	Sweden
Mother's Birthplace	Sweden
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	Swedish
Birth Country	Sweden
Birthplace (normalized)	sweden

1930

Cook, Illinois

Head, age 73

Cook, Illinois · implied b. ~1857 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Henderson
Given Name	Mary
Relationship to Head	Head
Sex	F
Color / Race	White
Age	73
Marital Status	Widowed
Birthplace	Sweden
Naturalization Status	Naturalized
Year of Immigration	1880
Age at First Marriage	19
Father's Birthplace	Sweden
Mother's Birthplace	Sweden
Can Read/Write	Yes
Mother Tongue	Swedish
Home Owned/Rented	O
Home Value / Rent	$4000
Radio Set	R
Birth Country	Sweden
Birthplace (normalized)	sweden

1940

Cook-County, Illinois

Head, age 84

Cook-County, Illinois · implied b. ~1856 — 4 household members

Surname	Henderson
Given Name	Mary J.
Relationship to Head	Head
Sex	F
Color / Race	White
Age	84
Marital Status	Widowed
Birthplace	Sweden
1935 Residence (City)	Chicago
1935 Residence (County)	Cook
Naturalization Status	Naturalized
Industry	H
Class of Worker	0
Highest Grade	No 6
1935 Residence	Same House
Birth Country	Sweden
Birthplace (normalized)	sweden

Model Tree

Linked across censuses

Our Model Tree links Mary Henderson 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 Henderson

Head · 1940 · age 84 · b. ~1856 · 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

40 people indexed on this census page (nara:1940:m-t0627-00943-00895)

Line	Name	Age	Relation	Occupation	Birthplace
1	Anne Sternal	25	Wife	—	Illinois
2	Frank Sternal	4	Son	—	Illinois
3	Mary Mchale	75	Head	—	Ireland
4	Margaret Barnett	78	Sister	—	Ireland
5	Harry V. Kalas	51	Head	Conductor	Illinois
6	Kattie M. Kalas	45	Wife	—	Germany
7	Joseph Kalas	18	Son	—	Illinois
8	Mary Kalas	16	Daughter	—	Illinois
9	Henry Kalas	15	Son	—	Illinois
10	Betty Kalas	6	Daughter	—	Illinois
11	Luke W. Grogan	44	Head	Police Man	Iowa
12	Mary Grogan	40	Wife	—	Illinois
13	William Grogan	18	Son	New Worker	Illinois
14	Robert Grogan	15	Son	—	Illinois
15	Luke Jr. Grogan	9	Son	—	Illinois
16	Joseph Leonard	73	Father in law	—	Ireland
17	Mary J. Henderson THIS PERSON	84	Head	—	Sweden
18	Henry Henderson	58	Son	—	Illinois
19	Harry Henderson	48	Son	Draftsman	Illinois
20	Helen Henderson	45	Daughter	File Clerk	Illinois
21	Albert Hudson	63	Head	—	Ohio
22	Lilly Hudson	63	Wife	—	Illinois
23	William Anderson	40	Head	Truck Driver	Illinois
24	Elizabeth Anderson	35	Wife	—	Illinois
25	William Jr. Anderson	15	Son	—	Illinois
26	Rita Anderson	9	Daughter	—	Illinois
27	Le Roy Anderson	1	Son	—	Illinois
28	Chas Felton	40	Head	Shipping Clerk	Illinois
29	Elizabeth Felton	32	Wife	—	Michigan
30	Gloria Felton	1	Daughter	—	Illinois
31	Thomas Murphy	37	Head	Watchman	Illinois
32	Mary E. Murphy	27	Wife	—	Illinois
33	Thomas Jr. Murphy	2	Son	—	Illinois
34	Richard Donohue	39	Head	Attendant	Illinois
35	Margaret B. Donohue	40	Wife	—	Illinois
36	Joseph Donohue	18	Son	New Worker	Illinois
37	Richard Donohue	16	Son	—	Illinois
38	Robert Wood	39	Head	Truck Driver	Michigan
39	Bernice Wood	40	Wife	—	Illinois
40	Frances Schmidt	65	Head	—	Germany

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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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