Earl Clark — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Marion-County, Iowa

Our Model Tree links this Earl Clark across the 1920, 1930 and 1940 US Censuses in Marion-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1901), then head of a 4-person household.

Age 39 b. ~1901 Male Head Born: Nebraska Married

1940 Census Record Details

Census Year	1940
Location	Marion-County, Iowa
Surname	Clark
Given Name	Earl M
Relationship to Head	Head
Sex	M
Color / Race	White
Age	39
Marital Status	Married
Birthplace	Nebraska
1935 Residence (City)	Harvey Town
1935 Residence (County)	Marion
Additional Details
Occupation	Attendant
Industry	Oil Station
Class of Worker	OA
Highest Grade	No 8
1935 Residence	Same place
Birth State	Nebraska
Birth Country	United States
Birthplace (normalized)	nebraska
Occupation	Attendant
Township / Ward	Harvey Town
Est. Birth Year	~1901

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 Earl	Age	Birth yr
Richard Clark	Son	—	12	~1928
Earl Clark	Head	—	39	~1901
Mary Clark	Spouse	—	38	~1902
Donald Clark	Son	—	5	~1935

Census Appearances

1920

Marion, Iowa

Other, age 20

Marion, Iowa · implied b. ~1900 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Clark
Given Name	Earl
Relationship to Head	Step Son
Sex	M
Color / Race	White
Age	20
Marital Status	Single
Birthplace	Nebraska
Father's Birthplace	Nebraska
Mother's Birthplace	Missouri
Occupation	Laborer
Industry	Working Out
Class of Worker	W
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	Nebraska
Birth Country	United States
Birthplace (normalized)	nebraska

1930

Marion, Iowa

Head, age 29

Marion, Iowa · implied b. ~1901 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Clark
Given Name	Earl M
Relationship to Head	Head
Sex	M
Color / Race	White
Age	29
Marital Status	Married
Birthplace	Nebraska
Age at First Marriage	23
Father's Birthplace	Missouri
Mother's Birthplace	Missouri
Occupation	Farmer
Industry	General Farm
Class of Worker	O
Can Read/Write	Yes
Home Owned/Rented	R
Birth State	Nebraska
Birth Country	United States
Birthplace (normalized)	nebraska

1940

Marion-County, Iowa

Head, age 39

Marion-County, Iowa · implied b. ~1901 — 4 household members

Surname	Clark
Given Name	Earl M
Relationship to Head	Head
Sex	M
Color / Race	White
Age	39
Marital Status	Married
Birthplace	Nebraska
1935 Residence (City)	Harvey Town
1935 Residence (County)	Marion
Occupation	Attendant
Industry	Oil Station
Class of Worker	OA
Highest Grade	No 8
1935 Residence	Same place
Birth State	Nebraska
Birth Country	United States
Birthplace (normalized)	nebraska

Model Tree

Linked across censuses

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

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This person

Anchor record

Earl Clark

Head · 1940 · age 39 · b. ~1901 · 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 — Marion-County, Iowa Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01181-00012)

Line	Name	Age	Relation	Occupation	Birthplace
41	Leroy J Van Vark	23	Head	Assistant Cashier	Iowa
42	Jessie Van Vark	21	Wife	Housewife	Iowa
43	William L Bean	37	Head	Operator	Missouri
44	Harriette Bean	33	Wife	Housewife	Iowa
45	Harreld G Bean	4	Son	—	Iowa
46	William T Bean	2	Son	—	Iowa
47	Oral A Coleman	38	Head	Housewife	Iowa
48	Elmar N Coleman	19	Son	Laborer	Iowa
49	Mary E Coleman	17	Daughter	—	Iowa
50	Calvin J Coleman	9	Son	—	Iowa
51	Earl M Clark THIS PERSON	39	Head	Attendant	Nebraska
52	Mary J Clark	38	Wife	Housewife	Iowa
53	Richard G Clark	12	Son	—	Iowa
54	Donald E Clark	5	Son	—	Iowa
55	Walter R Runnells	42	Head	Laborer	Iowa
56	Edna R Runnells	41	Wife	Housewife	Iowa
57	Robert F Runnells	14	Son	—	Iowa
58	Joseph E Bryan	24	Head	Mining	Iowa
59	Catherine J Bryan	24	Wife	Housewife	Iowa
60	Evans Thomas L Bryan	6	Son	—	Iowa
61	Mary M Cox	81	Head	—	Ohio
62	Clarence G Bennett	49	Head	Mining	Illinois
63	Mable Bennett	48	Wife	Housewife	Iowa
64	Orpha M Bennett	18	Daughter	New Worker	Iowa
65	Harry L Duer	32	Head	Mining	Kansas
66	Pearl M Duer	30	Wife	Housewife	Kansas
67	Glenn R Duer	10	Son	—	Kansas
68	Clyde W Duer	8	Son	—	Kansas
69	Cleo E Duer	7	Son	—	Kansas
70	Raymond R Duer	21	Lodger	Mining	Kansas
71	Henry L Allen	22	Lodger	Mining	Kansas
72	Henry H Hersey	31	Head	Clerk	Iowa
73	Violet M Hersey	30	Wife	Housewife	Iowa
74	Olive M Millard	76	Head	—	Iowa
75	Beckey A Grove	36	Head	—	Iowa
76	William H Grove	19	Son	New Worker	Iowa
77	Robert C Grove	15	Son	—	Iowa
78	Martha A Dennis	81	Head	—	Indiana
79	Jennie M Redding	66	Head	—	Iowa
80	William M Guthrie	56	Head	Laborer	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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