Margaret Mcmahon — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Clinton-County, Iowa

Our Model Tree links this Margaret Mcmahon across the 1920, 1930 and 1940 US Censuses in Clinton-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1882), then head of a 9-person household.

Age 58 b. ~1882 Female Spouse Born: Iowa Married

1940 Census Record Details

Census Year	1940
Location	Clinton-County, Iowa
Surname	McMahon
Given Name	Margaret
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	58
Marital Status	Married
Birthplace	Iowa
1935 Residence (City)	De Witt Twp
1935 Residence (County)	Clinton
Additional Details
Highest Grade	No 8
1935 Residence	Same House
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa
Township / Ward	De Witt Twp
Est. Birth Year	~1882

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.

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

Name	Relation to head	Relative to Margaret	Age	Birth yr
Ambrose Mcmahon	Son	—	17	~1923
Jerome Mcmahon	Son	—	14	~1926
Margaret Mcmahon	Spouse	—	58	~1882
Francis Mcmahon	Son	—	20	~1920
Melvin Larson	Other	—	28	~1912
Malachi Mcmahon	Head	—	62	~1878
Anna Milkey	Other	—	15	~1925
Melvin Larson	Other	—	3	~1937
Harold Larson	Other	—	4	~1936

Census Appearances

1920

Clinton, Iowa

Spouse, age 38

Clinton, Iowa · implied b. ~1882 — 8 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	McMahon
Given Name	Maggie
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	38
Marital Status	Married
Birthplace	Iowa
Father's Birthplace	Germany
Mother's Birthplace	Massachusetts
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	German
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1930

Clinton, Iowa

Spouse, age 47

Clinton, Iowa · implied b. ~1883 — 50 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	McMahon
Given Name	Maggie A
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	47
Marital Status	Married
Birthplace	Iowa
Age at First Marriage	23
Father's Birthplace	Germany
Mother's Birthplace	Massachusetts
Can Read/Write	Yes
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1940

Clinton-County, Iowa

Spouse, age 58

Clinton-County, Iowa · implied b. ~1882 — 9 household members

Surname	McMahon
Given Name	Margaret
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	58
Marital Status	Married
Birthplace	Iowa
1935 Residence (City)	De Witt Twp
1935 Residence (County)	Clinton
Highest Grade	No 8
1935 Residence	Same House
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

Model Tree

Linked across censuses

Our Model Tree links Margaret Mcmahon across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.

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This person

Anchor record

Margaret Mcmahon

Spouse · 1940 · age 58 · b. ~1882 · Iowa

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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 — Clinton-County, Iowa Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01151-00097)

Line	Name	Age	Relation	Occupation	Birthplace
1	Severna Bender	21	Daughter	Envelope Maker	Iowa
2	Peter Matthiesen	37	Head	Market Operator	Denmark
3	Frances Matthiesen	36	Wife	—	Czechoslovakia
4	Arthur Johnston	44	Head	Farmer	Iowa
5	Ellen Johnston	44	Wife	—	Nebraska
6	Anton Berg	52	Brother-in-law	Farmer	Iowa
7	Charles Bruckman	33	Head	Farmer	Illinois
8	Catherine Bruckman	29	Wife	—	Iowa
9	Dennis Bruckman	10	Son	—	Iowa
10	Patricia Bruckman	7	Daughter	—	Iowa
11	Charles Jr. Bruckman	2	Son	—	Iowa
12	Malachi Mcmahon	62	Head	Farmer	Iowa
13	Margaret Mcmahon THIS PERSON	58	Wife	—	Iowa
14	Francis Mcmahon	20	Son	Farmer	Iowa
15	Ambrose Mcmahon	17	Son	Farmer	Iowa
16	Jerome Mcmahon	14	Son	—	Iowa
17	Anna Milkey	15	Neice	—	Iowa
18	Melvin Larson	28	Son-in-law	Carpenter	Iowa
19	Harold Larson	4	Grandson	—	Iowa
20	Melvin Jr. Larson	3	Grandson	—	Iowa
21	Julia Mcmahon	61	Head	—	Iowa
22	Thomas Mcmahon	59	Brother	Farmer	Iowa
23	Leroy Bickel	30	Head	Farmer	Iowa
24	Genevieve Bickel	32	Wife	—	Iowa
25	Louise Bickel	5	Daughter	—	Iowa
26	Wayne Bickel	3	Son	—	Iowa
27	Edward Claussen	23	Hired Hand	Farm Laborer	Iowa
28	Albert Hahn	49	Head	Farmer	Iowa
29	Barbara Hahn	41	Wife	—	Kansas
30	Alice Hahn	16	Daughter	—	Iowa
31	Grace Hahn	13	Daughter	—	Iowa
32	Robert Hahn	11	Son	—	Iowa
33	Sylvester Hahn	11	Son	—	Iowa
34	Raymond Bleismer	22	Head	Farmer	Iowa
35	Frederick Fick	53	Head	Caretaker	Iowa
36	Elsie Fick	46	Wife	—	Illinois
37	Jeannette Fick	17	Daughter	—	Iowa
38	Matilda Fick	77	Mother	—	Iowa
39	William Burmeister	67	Head	Farmer	Iowa
40	August Burmeister	43	Son	Farmer	Iowa

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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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