John Mcmahon — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Okanogan-County, Washington

Our Model Tree links this John Mcmahon across the 1920, 1930 and 1940 US Censuses in Okanogan-County, Washington (XGBoost, ~Confirmed) — first a head (b.~1902), then head of a 3-person household.

Age 38 b. ~1902 Male Head Born: Montana Married

1940 Census Record Details

Census Year	1940
Location	Okanogan-County, Washington
Surname	McMahon
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	38
Marital Status	Married
Birthplace	Montana
1935 Residence (City)	Grand Coulee
1935 Residence (County)	Grant
Additional Details
Occupation	Carpenter foreman
Industry	Dam const
Class of Worker	PW
Hours Worked	40
Income (1939)	2800
Highest Grade	No 7
1935 Residence	Washington
Birth State	Montana
Birth Country	United States
Birthplace (normalized)	montana
Occupation	Carpenter Foreman
Township / Ward	Emerson Election Precinct
Est. Birth Year	~1902

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.

3 people recorded at the same address in the 1940 census.

Name	Relation to head	Relative to John	Age	Birth yr
John Mcmahon	Head	—	38	~1902
Raymond Mcmahon	Son	—	9	~1931
Agnes Mcmahon	Spouse	—	32	~1908

Census Appearances

1920

Snohomish, Washington

Other, age 18

Snohomish, Washington · implied b. ~1902 — 8 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	McMahon
Given Name	John
Relationship to Head	Boarder
Sex	M
Color / Race	White
Age	18
Marital Status	Single
Birthplace	Montana
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Occupation	Laborer
Industry	Logging Camp
Class of Worker	W
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	Montana
Birth Country	United States
Birthplace (normalized)	montana

1930

King, Washington

Other, age 28

King, Washington · implied b. ~1902 — 7 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	McMahon
Given Name	John
Sex	M
Color / Race	White
Age	28
Marital Status	Married
Birthplace	Montana
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Occupation	Carpenter
Industry	Washington Iron Works
Class of Worker	W
Can Read/Write	Yes
Birth State	Montana
Birth Country	United States
Birthplace (normalized)	montana

1940

Okanogan-County, Washington

Head, age 38

Okanogan-County, Washington · implied b. ~1902 — 3 household members

Surname	McMahon
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	38
Marital Status	Married
Birthplace	Montana
1935 Residence (City)	Grand Coulee
1935 Residence (County)	Grant
Occupation	Carpenter foreman
Industry	Dam const
Class of Worker	PW
Hours Worked	40
Income (1939)	2800
Highest Grade	No 7
1935 Residence	Washington
Birth State	Montana
Birth Country	United States
Birthplace (normalized)	montana

Model Tree

Linked across censuses

Our Model Tree links John Mcmahon across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.

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This person

Anchor record

John Mcmahon

Head · 1940 · age 38 · b. ~1902 · Washington

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

Original Census Page

1940 US Federal Census — Okanogan-County, Washington Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-04353-00133)

Line	Name	Age	Relation	Occupation	Birthplace
1	Janice Laird	6	Daughter	—	Nebraska
2	Curtis Laird	3	Son	—	Nebraska
3	Frank Whan	26	Head	Welder	Oklahoma
4	Madeline Whan	25	Wife	—	Montana
5	Delores Whan	6	Daughter	—	Montana
6	Harold Bunnell	34	Head	Pipefitter	Washington
7	Lillian Bunnell	30	Wife	—	Washington
8	Chester Smith	54	Head	Chief Oiler	Kentucky
9	Pearl Smith	51	Wife	—	Kentucky
10	Charles Larson	57	Head	Donkey Operator	Michigan
11	Ida Larson	39	Wife	—	Washington
12	Leslie Larson	3	Son	—	Washington
13	Allen Larson	1	Son	—	Washington
14	Norman Larson	0	Son	—	Washington
15	Alex Mclachlan	37	Head	Mechanic	Scotland
16	Adeline Mclachlan	33	Wife	—	Washington
17	Arlene Mclachlan	3	Daughter	—	Washington
18	John D. Primm	31	Head	Mechanic	California
19	Myrna Primm	31	Wife	—	Missouri
20	Patricia Primm	3	Daughter	—	Washington
21	Nancy Primm	1	Daughter	—	Washington
22	Melvin Pace	30	Head	Machinist	Washington
23	Viola Pace	30	Wife	—	Oregon
24	Dorothy Pace	1	Daughter	—	Washington
25	Clarence Canterbury	28	Head	Electrician	Washington
26	Edyth Canterbury	27	Wife	—	Washington
27	Lowell Canterbury	3	Son	—	Washington
28	Godfrey Smith	31	Head	Cement Finisher	Iowa
29	Esther Smith	24	Wife	—	Minnesota
30	La Salle Smith	3	Son	—	Minnesota
31	John Mcmahon THIS PERSON	38	Head	Carpenter Foreman	Montana
32	Agnes Mcmahon	32	Wife	—	Washington
33	Raymond Mcmahon	9	Son	—	Washington
34	Earl Smart	44	Head	Carpenter	Nebraska
35	Wilma Smart	31	Wife	—	California
36	George Brown	27	Head	Carpenter	Washington
37	Utine Brown	23	Wife	—	Washington
38	Karen Brown	2	Daughter	—	Washington
39	Muriel Brown	1	Daughter	—	Washington
40	Melvin Wood	35	Head	Donkey Operator	Idaho

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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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