John Kozlowski — 1920 US Census Record

Linked across censuses

1920 United States Federal Census · Mercer, New Jersey

Our Model Tree links this John Kozlowski across the 1920 and 1930 US Censuses in Mercer, New Jersey (XGBoost, ~Confirmed) — first a head (b.~1881), then head of a 7-person household.

Age 39 b. ~1881 Male Head Born: Lithuania Married

1920 Census Record Details

Census Year	1920
Location	Mercer, New Jersey
Surname	Kozlowski
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	39
Marital Status	Married
Birthplace	Lithuania
Year of Immigration	1910
Naturalization Status	Alien
Father's Birthplace	Lithuania
Mother's Birthplace	Lithuania
Additional Details
Occupation	Laborer
Industry	Pottery
Class of Worker	W
Can Read	Yes
Can Write	Yes
Speaks English	No
Mother Tongue	Lithuanian
Home Owned/Rented	R
Birth Country	Lithuania
Birthplace (normalized)	lithuania
Occupation	Laborer
Township / Ward	Trenton City
Est. Birth Year	~1881

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 1920 census.

Name	Relation to head	Relative to John	Age	Birth yr
Mary Kozlowski	Daughter	—	11	~1909
Alice Kozlowski	Daughter	—		~1920
Annie Kozlowski	Daughter	—	10	~1910
Edward Kozlowski	Son	—	5	~1915
John Kozlowski	Son	—	13	~1907
John Kozlowski	Head	—	39	~1881
Julia Kozlowski	Spouse	—	32	~1888

Census Appearances

1920

Mercer, New …

Head, age 39

Mercer, New Jersey · implied b. ~1881 — 7 household members

Surname	Kozlowski
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	39
Marital Status	Married
Birthplace	Lithuania
Year of Immigration	1910
Naturalization Status	Alien
Father's Birthplace	Lithuania
Mother's Birthplace	Lithuania
Occupation	Laborer
Industry	Pottery
Class of Worker	W
Can Read	Yes
Can Write	Yes
Speaks English	No
Mother Tongue	Lithuanian
Home Owned/Rented	R
Birth Country	Lithuania
Birthplace (normalized)	lithuania

1930

Lake, Indiana

Other, age 50

Lake, Indiana · implied b. ~1880 — 7 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Kozlowsky
Given Name	John
Relationship to Head	Roomer
Sex	M
Color / Race	White
Age	50
Marital Status	Widowed
Birthplace	Lithuania
Naturalization Status	First papers filed
Year of Immigration	1910
Age at First Marriage	28
Father's Birthplace	Lithuania
Mother's Birthplace	Lithuania
Occupation	Laborer
Industry	Foundry
Class of Worker	W
Can Read/Write	Yes
Mother Tongue	Lithuanian
Veteran	No
Birth Country	Lithuania
Birthplace (normalized)	lithuania

Model Tree

Linked across censuses

Our Model Tree links John Kozlowski across 2 US Census years (1920 and 1930) in 2 locations, using XGBoost record linkage.

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This person

Anchor record

John Kozlowski

Head · 1920 · age 39 · b. ~1881 · New Jersey

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

Original Census Page

1920 US Federal Census — Mercer, New Jersey Open full size

Page Contents

50 people indexed on this census page (ia:1920:14thcensusofpopu1052unit:0792)

Line	Name	Age	Relation	Occupation	Birthplace
51	John Kozlowski	46	Head	Laborer	Lithuania
52	Mary Kozlowski	28	Wife	Laborer	Lithuania
53	Frank Kozlowski	22	Son	Laborer	Lithuania
54	Blanche Kozlowski	19	Daughter	—	Lithuania
55	Mary Kozlowski	1	Daughter	—	New Jersey
56	Joseph Kozlowski	28	Lodger	Laborer	Poland
57	Theodore Kozlowski	44	Head	—	Poland
58	Mary Kozlowski	47	Wife	—	Poland
59	Stella Kozlowski	18	Daughter	—	New Jersey
60	Helen Kozlowski	14	Daughter	—	New Jersey
61	John Kozlowski THIS PERSON	39	Head	Laborer	Lithuania
62	Julia Kozlowski	32	Wife	—	Lithuania
63	John Kozlowski	13	Son	—	New Jersey
64	Mary Kozlowski	11	Daughter	—	New Jersey
65	Annie Kozlowski	10	Daughter	—	New Jersey
66	Edward Kozlowski	5	Son	—	New Jersey
67	Alice Kozlowski	0	Daughter	—	New Jersey
68	Frank Kozlowski	34	Head	Laborer	Lithuania
69	Mary Kozlowski	29	Wife	—	Lithuania
70	Frank Kozlowski	7	Son	—	New Jersey
71	Eva Kozlowski	3	Daughter	—	New Jersey
72	John Kozlowski	1	Son	—	New Jersey
73	Mary Kozlowski	26	Lodger	Laborer	Lithuania
74	John Kozlowski	26	Head	Laborer	Lithuania
75	Mary Kozlowski	24	Wife	—	Lithuania
76	Frank Kozlowski	2	Son	—	New Jersey
77	Joseph Kozlowski	1	Son	—	New Jersey
78	Annie Kozlowski	0	Daughter	—	New Jersey
79	Frank Kozlowski	37	Head	Laborer	Lithuania
80	Mary Kozlowski	31	Wife	—	Lithuania
81	John Kozlowski	13	Son	—	New Jersey
82	Mary Kozlowski	8	Daughter	—	New Jersey
83	Frank Kozlowski	5	Son	—	New Jersey
84	Joseph Kozlowski	2	Son	—	New Jersey
85	John Kozlowski	21	Head	Laborer	Lithuania
86	Mary Kozlowski	19	Wife	Laborer	Lithuania
87	Frank Kozlowski	1	Son	—	New Jersey
88	Joseph Kozlowski	23	Lodger	Laborer	Lithuania
89	Annie Kozlowski	11	Lodger	—	New Jersey
90	Frank Kozlowski	51	Head	Decorator	Germany
91	Mary Kozlowski	47	Wife	—	Germany
92	Frank Kozlowski	19	Son	Machinist	New Jersey
93	John Kozlowski	45	Head	Laborer	New Jersey
94	Mary Kozlowski	43	Wife	—	New Jersey
95	Edith Kozlowski	22	Daughter	Laborer	New Jersey
96	Gertrude Kozlowski	19	Daughter	Laborer	New Jersey
97	Harry Kozlowski	17	Son	Laborer	New Jersey
98	Marie Kozlowski	15	Daughter	—	New Jersey
99	Elizabeth Kozlowski	12	Daughter	—	New Jersey
100	John Kozlowski	10	Son	—	New Jersey

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About This Record & Model Tree

This record was independently indexed by YourRoots from the 1920 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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