John Jacobs — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Cook-County, Illinois

Our Model Tree links this John Jacobs across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1891), then head of a 3-person household.

Age 49 b. ~1891 Male Head Born: Lithuania Widowed

1940 Census Record Details

Census Year	1940
Location	Cook-County, Illinois
Surname	Jacobs
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	49
Marital Status	Widowed
Birthplace	Lithuania
1935 Residence (City)	Chicago
1935 Residence (County)	Cook
Naturalization Status	Naturalized
Additional Details
Occupation	Proprietor
Industry	Grocery Store
Class of Worker	OA
Hours Worked	70
Income (1939)	520
Highest Grade	No 8
1935 Residence	Same place
Birth Country	Lithuania
Birthplace (normalized)	lithuania
Occupation	Proprietor
Township / Ward	Chicago
Est. Birth Year	~1891

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 John	Age	Birth yr
John Jacobs	Head	—	49	~1891
Albert Jacobs	Son	—	22	~1918
Peter Jacobs	Son	—	22	~1918

Census Appearances

1920

Cook, Illinois

Other, age 28

Cook, Illinois · implied b. ~1892 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Jacobs
Given Name	John
Relationship to Head	Roomer
Sex	M
Color / Race	White
Age	28
Marital Status	Single
Birthplace	Lithuania
Year of Immigration	1910
Naturalization Status	Naturalized
Father's Birthplace	Germany
Mother's Birthplace	Germany
Occupation	Vocational Training
Class of Worker	W
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	Lithuanian
Birth Country	Lithuania
Year of Naturalization	1919
Birthplace (normalized)	lithuania

1930

Cook, Illinois

Other, age 40

Cook, Illinois · implied b. ~1890 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Jacobs
Given Name	John M.
Relationship to Head	Boarder
Sex	M
Color / Race	White
Age	40
Marital Status	Single
Birthplace	Lithuania
Naturalization Status	Naturalized
Year of Immigration	1910
Father's Birthplace	Lithuania
Mother's Birthplace	Lithuania
Occupation	Laborer
Industry	Steel mill
Class of Worker	W
Can Read/Write	Yes
Mother Tongue	Lithuanian
Veteran	No
Birth Country	Lithuania
Birthplace (normalized)	lithuania

1940

Cook-County, Illinois

Head, age 49

Cook-County, Illinois · implied b. ~1891 — 3 household members

Surname	Jacobs
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	49
Marital Status	Widowed
Birthplace	Lithuania
1935 Residence (City)	Chicago
1935 Residence (County)	Cook
Naturalization Status	Naturalized
Occupation	Proprietor
Industry	Grocery Store
Class of Worker	OA
Hours Worked	70
Income (1939)	520
Highest Grade	No 8
1935 Residence	Same place
Birth Country	Lithuania
Birthplace (normalized)	lithuania

Model Tree

Linked across censuses

Our Model Tree links John Jacobs across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.

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This person

Anchor record

John Jacobs

Head · 1940 · age 49 · b. ~1891 · 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-t0627-00944-00550)

Line	Name	Age	Relation	Occupation	Birthplace
1	Carl Sr Heid	57	Head	Carpenter	Switzerland
2	Barbara Heid	54	Wife	—	Switzerland
3	Anthony J Baaste	65	Lodger	Barber	Illinois
4	John Jacobs THIS PERSON	49	Head	Proprietor	Lithuania
5	Peter Jacobs	22	Son	Truck Driver	Illinois
6	Albert Jacobs	22	Son	Truck Driver	Illinois
7	Anne O'Brien	63	Head	Janitress	New York
8	Robert O'Brien	31	Son	Clerk-Office	Illinois
9	Mary Joe O'Brien	25	Daughter	Teacher	Illinois
10	Ellen Mangan	32	Daughter	—	Illinois
11	Thomas Mangan	6	Son-in-law	—	Illinois
12	Dody Kelly	65	Sister	—	New York
13	Paul Cooper	29	Head	Proprietor	Illinois
14	Mae Cooper	38	Wife	Bartender	Missouri
15	James Vergnay	29	Head	Laborer	Illinois
16	Emily Vergnay	27	Wife	—	Indiana
17	—	None	—	—	—
18	—	None	—	—	—
19	Stanley Adams	65	Head	Proprietor	Lithuania
20	Jessie Adams	53	Wife	Waitress	Lithuania
21	Stella Adams	23	Daughter	Waitress	Illinois
22	Wanda Gestner	21	Daughter	Hat Checker	Illinois
23	Florence Halvorsen	24	Daughter	Laborer	Illinois
24	Joan Gestner	5	Granddaughter	—	Illinois
25	Joseph Gestner	3	Grandson	—	Illinois
26	Frank Brugis	36	Head	Painter	Lithuania
27	John Ambroshaitis	52	Lodger	Laborer	Lithuania
28	Edwin Strom	47	Head	Truck Driver	Illinois
29	Bernice Strom	44	Wife	—	Lithuania
30	Vincent Akermot	19	Step-son	Laborer	Illinois
31	Andrew Akermot	16	Step-son	—	Illinois
32	Robert Akermot	11	Step-son	—	Illinois
33	Henry Gralow	56	Head	Laborer	Wisconsin
34	Lottie Gralow	50	Wife	—	Missouri
35	James Burns	32	Lodger	Press-Feeder	Illinois
36	Michael Guini	68	Head	12	Latvia
37	Charles Standus	50	Lodger	Laborer	Russia
38	James Udvare	33	Head	Attendant	Illinois
39	Frances Udvare	22	Wife	—	Illinois
40	James Jr. Udvare	5	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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