Sylvia Smith — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Alameda-County, California

Our Model Tree links this Sylvia Smith across the 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 5-person household.

Age 17 b. ~1923 Female Daughter Born: California Single

1940 Census Record Details

Census Year	1940
Location	Alameda-County, California
Surname	Smith
Given Name	Sylvia
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	17
Marital Status	Single
Birthplace	California
1935 Residence (City)	Alameda city
1935 Residence (County)	Alameda
Additional Details
Class of Worker	No
Hours Worked	0
Highest Grade	Hs 2
1935 Residence	Same Place
Birth State	California
Birth Country	United States
Birthplace (normalized)	california
Township / Ward	Alameda City
Est. Birth Year	~1923

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 Sylvia	Age	Birth yr
Carl Smith	Son	—	20	~1920
Carl Smith	Head	—	64	~1876
Agnes Smith	Spouse	—	45	~1895
Sylvia Smith	Daughter	—	17	~1923
Gertrude Smith	Daughter	—	21	~1919

Census Appearances

1930

Alameda, California

Other, age 7

Alameda, California · implied b. ~1923 — 5 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Smith
Given Name	Sylvia
Relationship to Head	Dau
Sex	F
Color / Race	White
Age	7
Marital Status	Single
Birthplace	California
Father's Birthplace	Illinois
Mother's Birthplace	Denmark
Can Read/Write	Yes
Birth State	California
Birth Country	United States
Birthplace (normalized)	california

1940

Alameda-County, California

Daughter, age 17

Alameda-County, California · implied b. ~1923 — 5 household members

Surname	Smith
Given Name	Sylvia
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	17
Marital Status	Single
Birthplace	California
1935 Residence (City)	Alameda city
1935 Residence (County)	Alameda
Class of Worker	No
Hours Worked	0
Highest Grade	Hs 2
1935 Residence	Same Place
Birth State	California
Birth Country	United States
Birthplace (normalized)	california

Model Tree

Linked across censuses

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

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This person

Anchor record

Sylvia Smith

Daughter · 1940 · age 17 · b. ~1923 · California

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Sibling

Gertrude Smith

Sibling · 1940 · age 21

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Carl Smith

Sibling · 1940 · age 20

Source co-child of head (derived)

● Co-child · derived · ~0.88

Confirmed / household (~0.90+) Probable / derived (~0.65–0.89) Candidate (<0.65, unverified)

Original Census Page

1940 US Federal Census — Alameda-County, California Open full size

Page Contents

39 people indexed on this census page (nara:1940:m-t0627-00183-00637)

Line	Name	Age	Relation	Occupation	Birthplace
1	Oscar F Catalone	30	Head	Claims Mgr	Connecticut
2	Percilla V Catalone	37	Wife	—	Connecticut
3	Robert V Catalone	0	Son	—	California
4	Willford Lion	41	Head	Oper Mgr	California
5	Kathryn Lion	31	Wife	—	California
6	Nancy Lion	4	Daughter	—	California
7	John M Byrne	42	Head	Credit Man	Tennessee
8	Juliet H Byrne	40	Wife	—	Hawaii
9	John M Byrne	19	Son	—	California
10	Ruth Byrne	17	Daughter	—	California
11	Geraldine Byrne	14	Daughter	—	Hawaii
12	Harvey Riley	36	Head	Deputy Collector	Canada-Eng
13	Elvin Riley	13	Son	—	California
14	Elva Riley	33	Wife	—	California
15	Lois Riley	4	Daughter	—	California
16	Francis E Allen	37	Head	Engineer	Iowa
17	Genevive Allen	38	Wife	—	Iowa
18	Mary Jean Allen	15	Daughter	—	Iowa
19	Joan Allen	13	Daughter	—	Iowa
20	Sidney Kennon	73	Father-in-law	—	Iowa
21	Block End	None	8	—	—
22	F. Lloyd Gregg	46	Head	Time-Keeper	California
23	Lorena Gregg	51	Wife	—	Ohio
24	Dorothy Mae Gregg	15	Daughter	—	California
25	Floyd Hans Gregg	11	Son	—	California
26	Elma F. Haws	82	Mother-in-law	—	Ohio
27	Frank Wickman	51	Head	Tailoring	Sweden
28	Elsa B Wickman	53	Wife	—	Sweden
29	L. Lloyd Joyce	31	Son-in-law	Clerk	California
30	Florence Joyce	30	Daughter	Comptometer	Illinois
31	Carl H Smith	64	Head	Painting	Illinois
32	Agnes L Smith	45	Wife	—	Denmark
33	Gertrude Smith	21	Daughter	Clerical	Minnesota
34	Carl Smith	20	Son	App. Machinist	Minnesota
35	Sylvia Smith THIS PERSON	17	Daughter	—	California
36	William Johnson	38	Head	Sargent	Wisconsin
37	Agnes L. Johnson	26	Wife	—	Massachusetts
38	John W. Johnson	15	Son	—	California
39	Lloyd R Johnson	6	Son	—	California

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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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