Mary Mckay — 1930 US Census Record

Linked across censuses

1930 United States Federal Census · Los Angeles, California

Our Model Tree links this Mary Mckay across the 1930 and 1940 US Censuses in Los Angeles, California (XGBoost, ~Confirmed) — first a daughter (b.~1916), then head of a 5-person household.

Age 14 b. ~1916 Female Daughter Born: California Single

1930 Census Record Details

Census Year	1930
Location	Los Angeles, California
Surname	McKay
Given Name	Mary G.
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	14
Marital Status	Single
Birthplace	California
Father's Birthplace	Scotland
Mother's Birthplace	Indiana
Additional Details
Can Read/Write	Yes
Birth State	California
Birth Country	United States
Birthplace (normalized)	california
Township / Ward	Pasadena City
Est. Birth Year	~1916

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 1930 census.

Name	Relation to head	Relative to Mary	Age	Birth yr
Mary Mckay	Daughter	—	14	~1916
Arthur Mckay	Head	—	56	~1874
Vernon Mckay	Son	—	25	~1905
Lena Mckay	Spouse	—	54	~1876
Gertrude Mckay	Daughter	—	23	~1907

Census Appearances

1930

Los Angeles, …

Daughter, age 14

Los Angeles, California · implied b. ~1916 — 5 household members

Surname	McKay
Given Name	Mary G.
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	14
Marital Status	Single
Birthplace	California
Father's Birthplace	Scotland
Mother's Birthplace	Indiana
Can Read/Write	Yes
Birth State	California
Birth Country	United States
Birthplace (normalized)	california

1940

Los-Angeles-County, California

Daughter, age 24

Los-Angeles-County, California · implied b. ~1916

● Primary link · ~Confirmed · 1 source

XGBoost

Surname	McKay
Given Name	Martha
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	24
Marital Status	Single
Birthplace	California
1935 Residence (City)	Los Angeles City
1935 Residence (County)	Los Angeles
Occupation	Cook
Industry	Oil Camp
Class of Worker	PW
Hours Worked	40
Income (1939)	720
Highest Grade	H 4
1935 Residence	Same place
Birth State	California
Birth Country	United States
Birthplace (normalized)	california

Model Tree

Linked across censuses

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

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This person

Anchor record

Mary Mckay

Daughter · 1930 · age 14 · b. ~1916 · California

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Sibling

Vernon Mckay

Sibling · 1930 · age 25

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Gertrude Mckay

Sibling · 1930 · age 23

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

1930 US Federal Census — Los Angeles, California Open full size

Page Contents

50 people indexed on this census page (ia:1930:californiacensus00reel169:0493)

Line	Name	Age	Relation	Occupation	Birthplace
51	Mary H. Bloedorn	71	Head	—	Illinois
52	Russell L. Biddle	26	Lodger	Teacher	Pennsylvania
53	John C. Nicoll	50	Head	Chauffeur	Canada-English
54	Johanna Nicoll	48	Wife	—	Iceland
55	Laura Nicoll	11	Daughter	—	California
56	John C. Jr. Nicoll	9	Son	—	California
57	Laura Nielsen	61	Sister-in-law	—	Iceland
58	Mary E. H. Jones	71	Head	—	New York
59	Sara K. Graham	20	Lodger	—	Texas
60	Arthur G. Sawyer	55	Head	Landscape Architect	New York
61	Theresa S. Sawyer	54	Wife	—	Sweden
62	Roger E. Sawyer	29	Son	Clerk	Massachusetts
63	Hattie M. Jones	59	Head	—	New York
64	Ella S. Hanson	60	Sister	—	New York
65	William R. Campbell	62	Head	Proprietor	England
66	Martha H. Campbell	42	Wife	—	Ohio
67	Neil Campbell	22	Son	Salesman	California
68	Wilbur S. Mcintyre	62	Head	Carpenter	Minnesota
69	Edith I. Mcintyre	39	Wife	—	Missouri
70	Warren D. Mcintyre	4	Son	—	California
71	Jason H. Garwood	75	Head	—	Pennsylvania
72	Ida F. Garwood	72	Wife	—	New York
73	James Matson	61	Head	Gardener	Irish Free State
74	Sarah J. Matson	59	Wife	—	Irish Free State
75	Eva M. Kendrick	40	Head	Proprietor	Iowa
76	Elizabeth J. Kendrick	84	Mother	—	Illinois
77	Veda M. Allen	48	Head	Designer	Massachusetts
78	Cora F. Esty	74	Mother	—	Maine
79	Albert Toy	59	Head	Manager	New York
80	Caroline C. Toy	53	Wife	—	New Jersey
81	Alice C. Toy	32	Daughter	Teacher	New York
82	Albert H. Toy	23	Son	Teacher	New York
83	Arthur J. Toy	21	Son	—	New York
84	Ruth E. Toy	19	Daughter	—	New York
85	Arthur W. Mckay	56	Head	Proprietor	Scotland
86	Lena A. Mckay	54	Wife	—	Indiana
87	Vernon W. Mckay	25	Son	Meat Cutter	New Jersey
88	Gertrude M. Mckay	23	Daughter	—	New Jersey
89	Mary G. Mckay THIS PERSON	14	Daughter	—	California
90	Alex C. Riddler	39	Head	Proprietor	Illinois
91	Lily A. Riddler	38	Wife	—	Nebraska
92	Bean T. Knight	38	Head	Fireman	Vermont
93	Mabel W. Knight	39	Wife	—	Canada-English
94	Curtis G. Knight	16	Son	—	California
95	Louise L. Knight	13	Daughter	—	California
96	Jackson Knight	9	Son	—	California
97	J. Elmer Van Duyne	55	Head	Salesman	New Jersey
98	Cora Van Duyne	55	Wife	—	New Jersey
99	J. Allen Toland	58	Head	Salesman	Illinois
100	Nellie K. Toland	57	Wife	—	Missouri

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About This Record & Model Tree

This record was independently indexed by YourRoots from the 1930 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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