Mary Hess — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Cook-County, Illinois

Our Model Tree links this Mary Hess across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1881), then head of a 3-person household.

Age 59 b. ~1881 Female Head Born: Illinois Widowed

1940 Census Record Details

Census Year	1940
Location	Cook-County, Illinois
Surname	Hess
Given Name	Mary A.
Relationship to Head	Head
Sex	F
Color / Race	White
Age	59
Marital Status	Widowed
Birthplace	Illinois
1935 Residence (City)	Chicago
1935 Residence (County)	Cook
Additional Details
Highest Grade	No 8
1935 Residence	Same place
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois
Township / Ward	Chicago
Est. Birth Year	~1881

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.

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

Name	Relation to head	Relative to Mary	Age	Birth yr
Mary Hess	Head	—	59	~1881
Matthew Hess	Son	—	37	~1903
Raymond Hess	Son	—	40	~1900

Census Appearances

1920

Cook, Illinois

Head, age 41

Cook, Illinois · implied b. ~1879 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Hess
Given Name	Mary
Relationship to Head	Head
Sex	F
Color / Race	White
Age	41
Marital Status	Widowed
Birthplace	Illinois
Father's Birthplace	Luxemburg
Mother's Birthplace	Luxemburg
Occupation	none
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	English
Home Owned/Rented	R
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

1930

Cook, Illinois

Head, age 49

Cook, Illinois · implied b. ~1881 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Hess
Given Name	Mary
Relationship to Head	Head
Sex	F
Color / Race	White
Age	49
Marital Status	Widowed
Birthplace	Illinois
Father's Birthplace	Luxemburg
Mother's Birthplace	Wisconsin
Can Read/Write	Yes
Home Owned/Rented	O
Home Value / Rent	$15000
Radio Set	No
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

1940

Cook-County, Illinois

Head, age 59

Cook-County, Illinois · implied b. ~1881 — 3 household members

Surname	Hess
Given Name	Mary A.
Relationship to Head	Head
Sex	F
Color / Race	White
Age	59
Marital Status	Widowed
Birthplace	Illinois
1935 Residence (City)	Chicago
1935 Residence (County)	Cook
Highest Grade	No 8
1935 Residence	Same place
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

Model Tree

Linked across censuses

Our Model Tree links Mary Hess 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 Hess

Head · 1940 · age 59 · b. ~1881 · 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-t0627-01017-00291)

Line	Name	Age	Relation	Occupation	Birthplace
1	William Murphy	22	Son	Stenographer	Illinois
2	Mary Murphy	69	Mother	—	Ireland
3	Madge Holland	37	Sister-in-law	Stenographer	Michigan
4	Phyllis Purvis	52	Sister	Stenographer	Illinois
5	Robert Purvis	49	Brother	Textile Salesman	Illinois
6	Mary A. Hess THIS PERSON	59	Head	—	Illinois
7	Raymond Hess	40	Son	Jobber	Illinois
8	Matthew Hess	37	Son	Salesman	Illinois
9	Robert Stephen	35	Head	Grocery Clerk	Scotland
10	Winifred Stephen	31	Wife	Saleswoman	Scotland
11	Margaret Stephen	12	Daughter	—	Illinois
12	Reed Roll	64	Boarder	Housekeeper	Illinois
13	Carl Lundberg	54	Head	Janitor	Sweden
14	Hannie D. Lundberg	47	Wife	Baker Helper	Sweden
15	Harold Lundberg	21	Son	Porter	Illinois
16	Arthur Nord	19	Step-son	Baker Helper	Illinois
17	Michael Hennessey	55	Head	—	Wisconsin
18	Margaret Hennessey	18	Daughter	—	Illinois
19	John Hennessey	16	Son	Warehouse Laborer	Illinois
20	Thomas Hennessey	15	Son	—	Illinois
21	Robert Hennessey	13	Son	—	Illinois
22	Joseph Hennessey	12	Son	—	Illinois
23	Frank O'Hare	42	Head	Accountant	Illinois
24	Adelaide G. O'Hare	40	Wife	—	Illinois
25	Celine O'Hare	13	Daughter	—	Illinois
26	Phillip A. Sanders	45	Head	Auditor	Illinois
27	Louise Sanders	35	Wife	—	Illinois
28	Phillip Jr. Sanders	6	Son	—	Illinois
29	Caesar Dupont	49	Head	Janitor	Belgium
30	Catherine Dupont	41	Wife	—	Belgium
31	Alice Dupont	17	Daughter	—	Illinois
32	Mary Jane Dupont	11	Daughter	—	Illinois
33	Lorraine Dupont	5	Daughter	—	Illinois
34	John Wilmot	29	Head	Insurance Adjuster	Illinois
35	Margaret A. Wilmot	26	Wife	—	Illinois
36	Gail Wilmot	7	Daughter	—	Illinois
37	Adeline Wynn	49	Mother-in-law	Companion	Ohio
38	Julia D. Stafford	48	Head	Senior Clerk	Illinois
39	Thomas Stafford	61	Brother	—	Illinois
40	Margaret Dunphy	60	Aunt	—	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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