John Carlson — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Cass-County, Iowa

Our Model Tree links this John Carlson across the 1920, 1930 and 1940 US Censuses in Cass-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1872), then head of a 7-person household.

Age 68 b. ~1872 Male Head Born: Iowa Married

1940 Census Record Details

Census Year	1940
Location	Cass-County, Iowa
Surname	Carlson
Given Name	John W.
Relationship to Head	Head
Sex	M
Color / Race	White
Age	68
Marital Status	Married
Birthplace	Iowa
1935 Residence (City)	Grove Township
1935 Residence (County)	Cass
Additional Details
Occupation	Farmer
Industry	Stock farm
Class of Worker	OA
Hours Worked	60
Income (1939)	0
Highest Grade	No 8
1935 Residence	Same house
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa
Occupation	Farmer
Township / Ward	Grove Township
Est. Birth Year	~1872

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.

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

Name	Relation to head	Relative to John	Age	Birth yr
Ruby Hansen	Daughter	—	31	~1909
John Carlson	Head	—	68	~1872
Wayne Blunk	Other	—	19	~1921
Harold Hansen	Other	—	7	~1933
Rosetta Hansen	Other	—	9	~1931
Ralph Carlson	Son	—	29	~1911
Caroline Carlson	Spouse	—	62	~1878

Census Appearances

1920

Cass, Iowa

Head, age 48

Cass, Iowa · implied b. ~1872 — 5 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Carlson
Given Name	John A.
Relationship to Head	Head
Sex	M
Color / Race	White
Age	48
Marital Status	Married
Birthplace	Iowa
Father's Birthplace	Sweden
Mother's Birthplace	Sweden
Occupation	General Farm
Industry	Farm
Class of Worker	OA
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Home Owned/Rented	O
Home Free/Mortgaged	F
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1930

Cass, Iowa

Head, age 58

Cass, Iowa · implied b. ~1872 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Carlson
Given Name	John M.
Relationship to Head	Head
Sex	M
Color / Race	White
Age	58
Marital Status	Married
Birthplace	Iowa
Age at First Marriage	33
Father's Birthplace	Sweden
Mother's Birthplace	Sweden
Occupation	Farmer
Industry	Farming
Class of Worker	VVVV
Can Read/Write	Yes
Home Owned/Rented	O
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1940

Cass-County, Iowa

Head, age 68

Cass-County, Iowa · implied b. ~1872 — 7 household members

Surname	Carlson
Given Name	John W.
Relationship to Head	Head
Sex	M
Color / Race	White
Age	68
Marital Status	Married
Birthplace	Iowa
1935 Residence (City)	Grove Township
1935 Residence (County)	Cass
Occupation	Farmer
Industry	Stock farm
Class of Worker	OA
Hours Worked	60
Income (1939)	0
Highest Grade	No 8
1935 Residence	Same house
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

Model Tree

Linked across censuses

Our Model Tree links John Carlson 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 Carlson

Head · 1940 · age 68 · b. ~1872 · 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 — Cass-County, Iowa Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01145-00370)

Line	Name	Age	Relation	Occupation	Birthplace
1	Henry R. Bell	41	Head	Farmer	Iowa
2	Mary Bell	41	Wife	—	Iowa
3	John Bell	7	Son	—	Iowa
4	John T. Humphrey	73	Father-in-law	—	Iowa
5	Rose T. Pollock	46	Head	Farmer	Iowa
6	Mary C. Pollock	76	Mother	—	Ohio
7	Emma S. Kearney	63	Maid	Servant	Iowa
8	Jess A. Camps	61	Head	Farmer	Iowa
9	Nettie Camps	71	Wife	—	Iowa
10	Pearl Carver	45	Step-daughter	—	Iowa
11	Elmer C. Camp	57	Brother	Steam Engineer	Iowa
12	Jackie A. Camp	5	Grandson	—	Iowa
13	Roy Carver	50	Head	Farmer	Iowa
14	Florence M. Carver	41	Wife	—	Iowa
15	Jeanette Carver	13	Daughter	—	Iowa
16	Wayne Carver	10	Son	—	Iowa
17	Leroy Vernon	53	Head	Farmer	Nebraska
18	Jennie Mae Vernon	43	Wife	—	Iowa
19	Eleanor M. Vernon	16	Daughter	—	Iowa
20	Doris Ann Vernon	4	Daughter	—	Iowa
21	Robert D. Vernon	2	Son	—	Iowa
22	Ralph M. Fancolly	44	Head	Farm Hand	Iowa
23	Esther R. Fancolly	46	Wife	—	Iowa
24	John W. Carlson THIS PERSON	68	Head	Farmer	Iowa
25	Caroline M. Carlson	62	Wife	—	Iowa
26	Ralph L. Carlson	29	Son	Farmer	Iowa
27	Ruby Hansen	31	Daughter	—	Iowa
28	Rosetta Hansen	9	Granddaughter	—	Iowa
29	Harold H. Hansen	7	Grandson	—	Iowa
30	Wayne Blunk	19	Hired hand	Farm Hand	Iowa
31	John Q. Wheatley	24	Head	Truck Driver	Iowa
32	Lena E. Wheatley	24	Wife	—	Iowa
33	Roy D. Wheatley	2	Son	—	Iowa
34	Lloyd J. Wheatley	0	Son	—	Iowa
35	Caleb A. Smith	61	Head	Farmer	Iowa
36	Sadie C. Smith	57	Wife	—	Iowa
37	Joe W. Blake	72	Head	Farmer	Illinois
38	Mildred R. Blake	40	Daughter	—	Iowa
39	Bee Blake	39	Daughter	—	Iowa
40	Kenneth Butler	18	Head	Farm Hand	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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