John Cahill — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Preble-County, Ohio

Our Model Tree links this John Cahill across the 1920, 1930 and 1940 US Censuses in Preble-County, Ohio (XGBoost, ~Confirmed) — first a head (b.~1880), then head of a 4-person household.

Age 60 b. ~1880 Male Head Born: Ohio Married

1940 Census Record Details

Census Year	1940
Location	Preble-County, Ohio
Surname	Cahill
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	60
Marital Status	Married
Birthplace	Ohio
1935 Residence (City)	Jefferson township
1935 Residence (County)	Preble
Additional Details
Occupation	Farmer
Industry	Farm
Class of Worker	OA
Hours Worked	75
Income (1939)	0
Highest Grade	H-2
1935 Residence	Same place
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio
Occupation	Farmer
Township / Ward	Jefferson Township
Est. Birth Year	~1880

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 John	Age	Birth yr
James Cahill	Son	—	20	~1920
Catherine Cahill	Spouse	—	55	~1885
Martha Cahill	Daughter	—	20	~1920
John Cahill	Head	—	60	~1880

Census Appearances

1920

Preble, Ohio

Head, age 39

Preble, Ohio · implied b. ~1881 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Cahill
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	39
Marital Status	Married
Birthplace	Ohio
Father's Birthplace	Ohio
Mother's Birthplace	Ohio
Occupation	Farmer
Industry	General farm
Class of Worker	OA
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Home Owned/Rented	O
Home Free/Mortgaged	M
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

1930

Preble, Ohio

Head, age 49

Preble, Ohio · implied b. ~1881 — 7 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Cahill
Given Name	John E.
Relationship to Head	Head
Sex	M
Color / Race	White
Age	49
Marital Status	Married
Birthplace	Ohio
Age at First Marriage	27
Father's Birthplace	Ohio
Mother's Birthplace	Ohio
Occupation	Farmer
Industry	General farm
Class of Worker	W
Can Read/Write	Yes
Home Owned/Rented	O
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

1940

Preble-County, Ohio

Head, age 60

Preble-County, Ohio · implied b. ~1880 — 4 household members

Surname	Cahill
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	60
Marital Status	Married
Birthplace	Ohio
1935 Residence (City)	Jefferson township
1935 Residence (County)	Preble
Occupation	Farmer
Industry	Farm
Class of Worker	OA
Hours Worked	75
Income (1939)	0
Highest Grade	H-2
1935 Residence	Same place
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

Model Tree

Linked across censuses

Our Model Tree links John Cahill 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 Cahill

Head · 1940 · age 60 · b. ~1880 · 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 — Preble-County, Ohio Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-03132-00291)

Line	Name	Age	Relation	Occupation	Birthplace
1	Omar D. Dine	27	Head	Farmer	Ohio
2	Lola Dine	27	Wife	—	Ohio
3	Floyd Nickolamy	42	Head	—	Ohio
4	Iretta Nickolamy	41	Wife	Proprietress	Ohio
5	Doris Nickolamy	19	Daughter	—	Indiana
6	Floyd Jr. Nickolamy	15	Son	—	Indiana
7	Mary Jane Nickolamy	10	Daughter	—	Ohio
8	Dr. E. E. Curry	77	Head	Medical Doctor	Ohio
9	Fannie Curry	77	Wife	—	Ohio
10	Edna Fudge	81	Head	Farmer	Ohio
11	Maggie Fudge	74	Wife	—	Indiana
12	John Cahill THIS PERSON	60	Head	Farmer	Ohio
13	Catherine Cahill	55	Wife	—	Ohio
14	James Cahill	20	Son	Farm Laborer	Ohio
15	Martha Cahill	20	Daughter	Beauty Operator	Ohio
16	Daniel Horrigan	55	Head	Farmer	Ohio
17	Caroline Horrigan	54	Wife	—	Ohio
18	Daniel Jr. Horrigan	16	Son	—	Ohio
19	John Young	43	Head	Farm Laborer	Ohio
20	Clara Young	40	Wife	—	Ohio
21	Margaret Young	17	Daughter	—	Ohio
22	P. G. Swerer	37	Head	Butcher	Ohio
23	Minnie Swerer	37	Wife	—	Ohio
24	Frank Marshall	40	Head	Farmer	Ohio
25	Marie Marshall	35	Wife	—	Pennsylvania
26	Robert Marshall	13	Son	—	Ohio
27	John Marshall	12	Son	—	Ohio
28	Pierce Markey	30	Head	Clerk	Ohio
29	Donna Markey	29	Wife	—	Ohio
30	Marlin Markey	5	Son	—	Indiana
31	Charlene Markey	3	Daughter	—	Ohio
32	Raymond Shelani	28	Head	Salesman	Indiana
33	Gertrude Shelani	25	Wife	—	Indiana
34	Phyllis Shelani	2	Daughter	—	Indiana
35	Fred Davis	58	Head	Farmer	Indiana
36	Ethel Davis	46	Wife	—	Indiana
37	D. J. Petty	35	Head	Farmer	Ohio
38	Anna Petty	32	Wife	—	Ohio
39	Lucille Petty	21	Daughter	—	Ohio
40	Daniel Jr. Petty	18	Son	Farm Laborer	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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