John Hart — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Clark-County, Ohio

Our Model Tree links this John Hart across the 1920, 1930 and 1940 US Censuses in Clark-County, Ohio (XGBoost, ~Confirmed) — first a head (b.~1883), then head of a 3-person household.

Age 57 b. ~1883 Male Head Born: Ohio Married

1940 Census Record Details

Census Year	1940
Location	Clark-County, Ohio
Surname	Hart
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	57
Marital Status	Married
Birthplace	Ohio
1935 Residence (City)	Springfield
1935 Residence (County)	Clark
Additional Details
Occupation	Mechanic
Industry	Garage
Class of Worker	PW
Hours Worked	48
Income (1939)	1200
Highest Grade	8
1935 Residence	Same House
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio
Occupation	Mechanic
Township / Ward	Springfield
Est. Birth Year	~1883

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 Hart	Head	—	57	~1883
Kenneth Hart	Son	—	32	~1908
Hazel Hart	Spouse	—	53	~1887

Census Appearances

1920

Clark, Ohio

Head, age 37

Clark, Ohio · implied b. ~1883 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Hart
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	37
Marital Status	Married
Birthplace	Ohio
Father's Birthplace	Maryland
Mother's Birthplace	Ohio
Occupation	Mechanic
Industry	Automobile
Class of Worker	W
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Home Owned/Rented	O
Home Free/Mortgaged	F
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

1930

Clark, Ohio

Head, age 47

Clark, Ohio · implied b. ~1883 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Hart
Given Name	John H
Relationship to Head	Head
Sex	M
Color / Race	White
Age	47
Marital Status	Married
Birthplace	Ohio
Age at First Marriage	24
Father's Birthplace	Ohio
Mother's Birthplace	Ohio
Occupation	Mechanic
Industry	Automobile Garage
Class of Worker	W
Can Read/Write	Yes
Home Owned/Rented	O
Home Value / Rent	9000
Radio Set	R
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

1940

Clark-County, Ohio

Head, age 57

Clark-County, Ohio · implied b. ~1883 — 3 household members

Surname	Hart
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	57
Marital Status	Married
Birthplace	Ohio
1935 Residence (City)	Springfield
1935 Residence (County)	Clark
Occupation	Mechanic
Industry	Garage
Class of Worker	PW
Hours Worked	48
Income (1939)	1200
Highest Grade	8
1935 Residence	Same House
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

Model Tree

Linked across censuses

Our Model Tree links John Hart 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 Hart

Head · 1940 · age 57 · b. ~1883 · Ohio

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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 — Clark-County, Ohio Open full size

Page Contents

39 people indexed on this census page (nara:1940:m-t0627-03040-00270)

Line	Name	Age	Relation	Occupation	Birthplace
1	Jack Souther	20	Brother	Polisher	Ohio
2	Fred Haller	37	Head	Polisher	Germany
3	Margaret Haller	35	Wife	Seamstress	Germany
4	Harry Hawkins	49	Head	Baker	Ohio
5	Esther Hawkins	49	Wife	Florist	Ohio
6	Virgil Harris	33	Head	Frame Plater	Ohio
7	Irene Harris	27	Wife	—	Ohio
8	Virginia Harris	10	Daughter	—	Ohio
9	Catherine Harris	8	Daughter	—	Ohio
10	Phyllis Harris	7	Daughter	—	Ohio
11	William Harris	6	Son	—	Ohio
12	Barbara Harris	2	Daughter	—	Ohio
13	Ross Maxey	58	Father-in-law	Laborer	Ohio
14	D. Harold Berry	46	Head	Postal Clerk	Ohio
15	Floy Berry	51	Wife	—	Texas
16	Betty B. Berry	22	Daughter	Clerk	Ohio
17	Emaline Berry	17	Daughter	—	Ohio
18	Richard Berry	15	Son	—	Ohio
19	R. A. Yarlough	30	Head	—	Ohio
20	Catherine Fitzgerald	60	Head	—	Ohio
21	Mary Fitzgerald	22	Daughter	—	Ohio
22	F. J. Hatton	28	Head	Salesman	Ohio
23	Margaret Hatton	28	Wife	—	Ohio
24	Mary Louise Hatton	7	Daughter	—	Ohio
25	Chester Mccartney	47	Head	P. Dept	Ohio
26	Mae Mccartney	46	Wife	—	Ohio
27	John Hart THIS PERSON	57	Head	Mechanic	Ohio
28	Hazel Hart	53	Wife	—	Ohio
29	Kenneth Hart	32	Son	Clerk	Ohio
30	Paul C. Milhollin	44	Head	Pressman	Ohio
31	Hazel Milhollin	51	Wife	—	Ohio
32	Carblyn Miller	83	Mother-in-law	—	Ohio
33	George Austin	30	Head	Truck Driver	Ohio
34	Norma Austin	26	Wife	Presser	Ohio
35	Lee M. Kosiby	37	Head	Mgr.	New York
36	Thelma Kosiby	34	Wife	—	Pa
37	Charles J. Anderson	57	Head	Truck Driver	Ohio
38	Elizabeth Anderson	53	Wife	Proprietor	Ohio
39	Anna M. Zimmer	20	Servant	Maid	Ohio

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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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