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John Mcmahon — 1930 US Census Record

Linked across censuses

1930 United States Federal Census · Kings, New York

Our Model Tree links this John Mcmahon across the 1920 and 1930 US Censuses in Kings, New York (XGBoost, ~Confirmed) — first a son (b.~1915), then head of a 10-person household.

Age 15 b. ~1915 Male Son Born: New York Single

1930 Census Record Details

Census Year1930
LocationKings, New York
SurnameMcMahon
Given NameJohn
Relationship to HeadSon
SexM
Color / RaceWhite
Age15
Marital StatusSingle
BirthplaceNew York
Father's BirthplaceNew York
Mother's BirthplaceNew York
Additional Details
OccupationMessenger
IndustryBank
Class of WorkerW
Can Read/WriteYes
Mother TongueEnglish
Birth StateNew York
Birth CountryUnited States
Birthplace (normalized)new york
OccupationMessenger
Township / WardBrooklyn City
Est. Birth Year~1915

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.

10 people recorded at the same address in the 1930 census.

Name Relation to head Relative to John Age Birth yr
Mary Mcmahon Daughter — 17 ~1913
James Mcmahon Head — 56 ~1874
John Mcmahon Son — 15 ~1915
Robert Mcmahon Son — 8 ~1922
William Mcmahon Son — 12 ~1918
Patrick Mcmahon Son — 26 ~1904
Edward Mcmahon Son — 21 ~1909
Thomas Mcmahon Son — 14 ~1916
James Mcmahon Son — 24 ~1906
Nellie Mcmahon Spouse — 45 ~1885

Census Appearances

1920
Kings, New …
Son, age 3
Kings, New York · implied b. ~1917 — 5 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname McMahon
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 3
Marital Status Single
Birthplace New York
Father's Birthplace New York
Mother's Birthplace New York
Birth State New York
Birth Country United States
Birthplace (normalized) new york
1930
Kings, New …
Son, age 15
Kings, New York · implied b. ~1915 — 10 household members
Surname McMahon
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 15
Marital Status Single
Birthplace New York
Father's Birthplace New York
Mother's Birthplace New York
Occupation Messenger
Industry Bank
Class of Worker W
Can Read/Write Yes
Mother Tongue English
Birth State New York
Birth Country United States
Birthplace (normalized) new york

Model Tree

An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Linked across censuses
Our Model Tree links John Mcmahon across 2 US Census years (1920 and 1930) in Kings, New York, using XGBoost record linkage.
Show:
This person
Anchor record
John Mcmahon
Son · 1930 · age 15 · b. ~1915 · New York
★ You are viewing this record
Sibling
James Mcmahon
Sibling · 1930 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mcmahon
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mcmahon
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Mcmahon
Sibling · 1930 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mcmahon
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Mcmahon
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mcmahon
Sibling · 1930 · age 21
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 — Kings, New York Open full size

Page Contents

50 people indexed on this census page (ia:1930:newyorkcensus00reel1526:0991)

Line Name Age Relation Occupation Birthplace
1 Geraldine Brenner 6 Daughter — New York
2 Peter Tkachenko 49 Head Mechanic Russia
3 Emma Tkachenko 43 Wife Housewife Russia
4 Gustave Zylberstein 38 Boarder — Russia
5 Benjamin Weiss 55 Head Operator Russia
6 Fannie Weiss 55 Wife Hand Work Russia
7 Morris Weiss 20 Son Plumber New York
8 Mildred Weiss 17 Daughter Bookkeeper New York
9 Henry Kahn 41 Head Clerk New York
10 Amelia Kahn 37 Wife Housewife New York
11 David Katz 37 Head Presser Russia
12 Ida Katz 38 Wife Housewife Russia
13 Jack Katz 13 Son — New York
14 Ruth Katz 9 Daughter — New York
15 Max Greenoff 50 Head Cutter Russia
16 Alice Greenoff 43 Wife Housewife Russia
17 Arthur S. Greenoff 19 Son Clerk New York
18 Fannie Victor Greenoff 16 Daughter — New York
19 Florence Greenoff 13 Daughter — New York
20 William Gitlan 34 Head Presser Roumania
21 Adela Gitlan 34 Wife Housewife Roumania
22 Rosalyn Gitlan 6 Daughter — New York
23 Estelle Gitlan 4 Daughter — New York
24 — None — — —
25 Arthur Morris 41 Head — New York
26 Nina D. Morris 37 Wife — New York
27 Arthur Jr. Morris 19 Son — New York
28 Robert Morris 17 Son — New York
29 Virginia Morris 11 Daughter — New York
30 Gloria Morris 5 Daughter — New York
31 James Mcmahon 56 Head Janitor New York
32 Nellie Mcmahon 45 Wife — New York
33 Patrick Mcmahon 26 Son — New York
34 James Mcmahon 24 Son Fireman New York
35 Edward Mcmahon 21 Son Operator New York
36 Mary Mcmahon 17 Daughter Operator New York
37 John Mcmahon THIS PERSON 15 Son Messenger New York
38 Thomas Mcmahon 14 Son — New York
39 William Mcmahon 12 Son — New York
40 Robert Mcmahon 8 Son — New York
41 Dorothy Brenner 27 Head Clerk New York
42 Eleanor Brenner 17 Half-Sister — New York
43 Martha King 65 Roomer Dressmaker New York
44 — None — — —
45 William Heim 45 Head — New York
46 Rocco Vincenzo 67 Head — Italy
47 Maria Vincenzo 63 Wife — Italy
48 Lawrence Vincenzo 25 Son — New York
49 Eleonore Vincenzo 26 Son Druggist New York
50 James Vincenzo 23 Son Mechanic New York

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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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