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William Mcmahon — 1920 US Census Record

Linked across censuses

1920 United States Federal Census · New York, New York

Our Model Tree links this William Mcmahon across the 1910 and 1920 US Censuses in New York, New York (XGBoost, ~Confirmed) — first a son (b.~1907), then head of a 8-person household.

Age 13 b. ~1907 Male Son Born: New York Single

1920 Census Record Details

Census Year	1920
Location	New York, New York
Surname	McMahon
Given Name	William
Relationship to Head	Son
Sex	M
Color / Race	White
Age	13
Marital Status	Single
Birthplace	New York
Father's Birthplace	Ireland
Mother's Birthplace	New York
Additional Details
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york
Township / Ward	Manhattan Borough
Est. Birth Year	~1907

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.

8 people recorded at the same address in the 1920 census.

Name	Relation to head	Relative to William	Age	Birth yr
Catherine Mcmahon	Daughter	—	23	~1897
James Mcmahon	Head	—	51	~1869
Anna Mcmahon	Daughter	—	16	~1904
Thomas Mcmahon	Son	—	15	~1905
Michael Mcmahon	Son	—	21	~1899
Elizabeth Mcmahon	Daughter	—	19	~1901
Mary Mcmahon	Daughter	—	30	~1890
William Mcmahon	Son	—	13	~1907

Census Appearances

1910

New York, …

Son, age 2

New York, New York · implied b. ~1908 — 5 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	McMahen
Given Name	William Jr
Relationship to Head	Son
Sex	M
Color / Race	Black
Age	2
Marital Status	Single
Birthplace	New York
Father's Birthplace	Massachusetts
Mother's Birthplace	New York
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

1920

New York, …

Son, age 13

New York, New York · implied b. ~1907 — 8 household members

Surname	McMahon
Given Name	William
Relationship to Head	Son
Sex	M
Color / Race	White
Age	13
Marital Status	Single
Birthplace	New York
Father's Birthplace	Ireland
Mother's Birthplace	New York
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

Model Tree

Linked across censuses

Our Model Tree links William Mcmahon across 2 US Census years (1910 and 1920) in New York, New York, using XGBoost record linkage.

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This person

Anchor record

William Mcmahon

Son · 1920 · age 13 · b. ~1907 · New York

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Sibling

Michael Mcmahon

Sibling · 1920 · age 21

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Elizabeth Mcmahon

Sibling · 1920 · age 19

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Mary Mcmahon

Sibling · 1920 · age 30

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Thomas Mcmahon

Sibling · 1920 · age 15

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Anna Mcmahon

Sibling · 1920 · age 16

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Catherine Mcmahon

Sibling · 1920 · 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

1920 US Federal Census — New York, New York Open full size

Page Contents

50 people indexed on this census page (ia:1920:14thcensusofpopu1189unit:0020)

Line	Name	Age	Relation	Occupation	Birthplace
1	William Schaefer	71	Lodger	Cooper	Pennsylvania
2	James F. Kelly	52	Head	Clerk	New York
3	Mary Kelly	45	Wife	—	New Jersey
4	James Mcmahon	28	Son-in-law	Pressman	New York
5	Mary Mcmahon	28	Daughter	—	New York
6	Rose Kearns	30	Sister	Examiner	New York
7	Eva Kearns	32	Sister	Leveler	New York
8	Kate Hayes	46	Head	Janitress	Ireland
9	Charles Hayes	21	Son	Bookkeeper	New York
10	Harry Hayes	19	Son	Stenographer	New York
11	Helen Hayes	16	Daughter	Operator	New York
12	Harold Hayes	13	Son	—	New York
13	Edward Rooney	41	Brother	Carpenter	Ireland
14	Mary Purdon	44	Head	—	Ireland
15	Henry Purdon	22	Son	Truck Driver	New York
16	Nora Purdon	18	Daughter	Clerk	New York
17	Catherine Purdon	16	Daughter	Clerk	New York
18	Philip Purdon	14	Son	—	New York
19	Daniel Purdon	12	Son	—	New York
20	Michael Purdon	10	Son	—	New York
21	Mary Funtrey	24	Daughter	—	Ireland
22	James Funtrey	31	Son-in-law	Porter	New York
23	James Mcmahon	51	Head	—	New York
24	Mary Mcmahon	30	Daughter	Supervisor	New York
25	Catherine Mcmahon	23	Daughter	Clerk	New York
26	Michael Mcmahon	21	Son	Laborer	New York
27	Elizabeth Mcmahon	19	Daughter	Clerk	New York
28	Anna Mcmahon	16	Daughter	Clerk	New York
29	Thomas Mcmahon	15	Son	—	New York
30	William Mcmahon THIS PERSON	13	Son	—	New York
31	Mary O'Keefe	75	Head	—	Ireland
32	David O'Keefe	35	Son	Clerk	New York
33	Isadore Lachmann	73	Head	Proprietor	Germany
34	Bertha Lachmann	66	Wife	—	Germany
35	Harriet Lachmann	35	Daughter	Clerk	New York
36	Arthur Lachmann	40	Son	Clerk	New York
37	Tobias Phillips	45	Son-in-law	Buyer	England
38	Julia Phillips	45	Daughter	—	New York
39	Grace Phillips	24	Daughter	Stenographer	New York
40	Dorothy Phillips	7	Daughter	—	New York
41	Frank Cronin	43	Head	Truck Driver	New York
42	Ann Cronin	44	Wife	—	New York
43	Frank Cronin	20	Son	Truck Driver	New York
44	James Cronin	17	Son	Messenger	New York
45	Anna Cronin	12	Daughter	—	New York
46	Michael Campbell	21	Son-in-law	Motor Mechanic	New Jersey
47	May Campbell	22	Daughter	—	New York
48	James Needham	48	Head	Laborer	New York
49	Anna Needham	42	Wife	—	New York
50	Irene Needham	15	Daughter	—	New York

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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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