John Slater — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Middlesex-County, Massachusetts

Our Model Tree links this John Slater across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1901), then head of a 5-person household.

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

1940 Census Record Details

Census Year	1940
Location	Middlesex-County, Massachusetts
Surname	Slater
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	39
Marital Status	Married
Birthplace	Illinois
1935 Residence (City)	Cambridge City
1935 Residence (County)	Middlesex
Additional Details
Occupation	Professor
Industry	College
Class of Worker	PW
Hours Worked	48
Income (1939)	4000
Highest Grade	C-5
1935 Residence	Same place
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois
Occupation	Professor
Township / Ward	Cambridge City
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.

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

Name	Relation to head	Relative to John	Age	Birth yr
Frederick Slater	Son	—	3	~1937
John Slater	Head	—	39	~1901
Louise Slater	Daughter	—	6	~1934
Clarke Slater	Son	—		~1940
Helen Slater	Spouse	—	36	~1904

Census Appearances

1930

Middlesex, Massachusetts

Head, age 29

Middlesex, Massachusetts · implied b. ~1901 — 2 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Slater
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	29
Marital Status	Married
Birthplace	Illinois
Age at First Marriage	25
Father's Birthplace	Virginia
Mother's Birthplace	Kansas
Occupation	Professor
Industry	College
Class of Worker	W
Can Read/Write	Yes
Home Owned/Rented	R
Home Value / Rent	65
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

1940

Middlesex-County, Massachusetts

Head, age 39

Middlesex-County, Massachusetts · implied b. ~1901 — 5 household members

Surname	Slater
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	39
Marital Status	Married
Birthplace	Illinois
1935 Residence (City)	Cambridge City
1935 Residence (County)	Middlesex
Occupation	Professor
Industry	College
Class of Worker	PW
Hours Worked	48
Income (1939)	4000
Highest Grade	C-5
1935 Residence	Same place
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

Model Tree

Linked across censuses

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

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This person

Anchor record

John Slater

Head · 1940 · age 39 · b. ~1901 · Massachusetts

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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 — Middlesex-County, Massachusetts Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01685-00459)

Line	Name	Age	Relation	Occupation	Birthplace
1	Norman Henry	53	Head	Musician	Massachusetts
2	Virginia Henry	41	Wife	—	Massachusetts
3	Christina Clough	70	Mother-in-law	—	Nova Scotia
4	Nanette Henry	19	Daughter	—	Massachusetts
5	Claude Henry	18	Son	—	Michigan
6	Wendela De Jonge	17	Lodger	—	Holland
7	Rachel Josefowitz	15	Lodger	—	Lithuania
8	John Slater THIS PERSON	39	Head	Professor	Illinois
9	Helen Slater	36	Wife	—	Louisiana
10	Louise Slater	6	Daughter	—	Massachusetts
11	Frederick Slater	3	Son	—	Massachusetts
12	Clarke Slater	0	Son	—	Massachusetts
13	Charles Weatherby	64	Head	Professor	Massachusetts
14	Una P. Weatherby	60	Wife	—	Massachusetts
15	Celia Brooks	44	Maid	Maid	Maine
16	Francis Lazenby	61	Head	Horticulturist	Massachusetts
17	Francis Spaulding	43	Head	Associate Dean	Massachusetts
18	Susan Spaulding	42	Wife	—	Massachusetts
19	Margaret Spaulding	13	Daughter	—	Massachusetts
20	Joan Spaulding	12	Daughter	—	Massachusetts
21	Stuart Chapin	43	Head	Professor	Massachusetts
22	Ruth Chapin	42	Wife	—	New York
23	Lee Chapin	19	Daughter	—	England
24	Paula Chapin	12	Daughter	—	Massachusetts
25	Olga Petrovick	28	Maid	Maid	Serbia
26	Walter A. Rourke	62	Head	Men'S Furnishings	Massachusetts
27	Idanna Davis	63	Daughter	Housekeeper	Eire
28	Fritz J. Roethlisberger	41	Head	Professor	New York
29	Margaret Roethlisberger	33	Wife	—	Arkansas
30	Jean Roethlisberger	5	Daughter	—	Massachusetts
31	Benjamin Schattman	59	Head	Manager	New York
32	Denning Schattman	25	Son	—	New York
33	Samuel Schattman	57	Brother	Credit Clearance	New York
34	Bridie Leonard	35	Maid	Maid	Eire
35	John J. Doyle	59	Head	Manager	Massachusetts
36	Mary G. Doyle	57	Wife	—	Massachusetts
37	Elizabeth Johnstone	64	Head	—	Massachusetts
38	Thora Johnstone	33	Daughter	Teacher	Massachusetts
39	Barbara Johnstone	30	Daughter	Secretary	Massachusetts
40	George Jr. Johnstone	22	Son	—	Massachusetts

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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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