Mary Mack — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Middlesex-County, Massachusetts

Our Model Tree links this Mary Mack across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1880), then head of a 3-person household.

Age 60 b. ~1880 Female Spouse Born: Scotland Married

1940 Census Record Details

Census Year	1940
Location	Middlesex-County, Massachusetts
Surname	Mack
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	60
Marital Status	Married
Birthplace	Scotland
1935 Residence (City)	Cambridge
1935 Residence (County)	Middlesex
Naturalization Status	Alien
Additional Details
Class of Worker	0
Highest Grade	S 5
1935 Residence	Same House
Birth Country	Scotland
Birthplace (normalized)	scotland
Township / Ward	Cambridge
Est. Birth Year	~1880

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 Mary	Age	Birth yr
Thomas Mack	Son	—	21	~1919
Thomas Mack	Head	—	60	~1880
Mary Mack	Spouse	—	60	~1880

Census Appearances

1920

Middlesex, Massachusetts

Spouse, age 40

Middlesex, Massachusetts · implied b. ~1880 — 8 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Mack
Given Name	Mary M.
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	40
Marital Status	Married
Birthplace	Scotland
Year of Immigration	1911
Naturalization Status	Alien
Father's Birthplace	Scotland
Mother's Birthplace	Scotland
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	Scotch
Birth Country	Scotland
Birthplace (normalized)	scotland

1930

Middlesex, Massachusetts

Other, age 50

Middlesex, Massachusetts · implied b. ~1880 — 12 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Mack
Given Name	Mary
Relationship to Head	Wife-H
Sex	F
Color / Race	White
Age	50
Marital Status	Married
Birthplace	Scotland
Naturalization Status	Naturalized
Year of Immigration	1909
Age at First Marriage	23
Father's Birthplace	Scotland
Mother's Birthplace	Scotland
Can Read/Write	Yes
Mother Tongue	English
Birth Country	Scotland
Birthplace (normalized)	scotland

1940

Middlesex-County, Massachusetts

Spouse, age 60

Middlesex-County, Massachusetts · implied b. ~1880 — 3 household members

Surname	Mack
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	60
Marital Status	Married
Birthplace	Scotland
1935 Residence (City)	Cambridge
1935 Residence (County)	Middlesex
Naturalization Status	Alien
Class of Worker	0
Highest Grade	S 5
1935 Residence	Same House
Birth Country	Scotland
Birthplace (normalized)	scotland

Model Tree

Linked across censuses

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

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This person

Anchor record

Mary Mack

Spouse · 1940 · age 60 · b. ~1880 · Massachusetts

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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 — Middlesex-County, Massachusetts Open full size

Page Contents

39 people indexed on this census page (nara:1940:m-t0627-01684-00843)

Line	Name	Age	Relation	Occupation	Birthplace
41	Henry R Coles	11	Son	—	Mass
42	Lilian Coles	6	Daughter	—	Mass
43	Charles Margeson	31	Head	Superintendent	Mass
44	Elsie Margeson	26	Wife	—	Canada English
45	Barbara Margeson	6	Daughter	—	Mass
46	Robert Margeson	0	Son	—	Mass
47	Emily Lutz	35	Head	—	Mass
48	Miriam L Lutz	15	Daughter	—	Mass
49	Lilian D Lutz	14	Daughter	—	Mass
50	David O Lutz	10	Son	—	Mass
51	Lilian Fitzgerald	39	Head	Cutter	Canada English
52	David J Fitzgerald	9	Son	—	Mass
53	John Hayes	32	Head	Cutter	Mass
54	Eulalia Hayes	25	Wife	—	Mass
55	John Hayes	2	Son	0	Mass
56	Catherine Hayes	0	Daughter	0	Mass
57	Michal Macmillan	42	Head	Packer	Canada English
58	Ester Macmillan	35	Wife	—	Mass
59	Helen Macmillan	9	Daughter	—	Mass
60	Malcolm Macmillan	8	Son	—	Mass
61	Muriel Macmillan	2	Daughter	—	Mass
63	Thomas Mack	60	Head	Laborer	Scotland
64	Mary Mack THIS PERSON	60	Wife	—	Scotland
65	Thomas W Mack	21	Son	Floorman	Mass
66	Alfred Lese	50	Head	Operator	Italy
67	Mary Lese	41	Wife	—	Italy
68	Josephine Lese	22	Daughter	Secretary	Mass
69	Vincent Lese	18	Son	—	Mass
70	Bessie Fagerhalt	63	Head	—	Norway
71	Andrew Arnesen	40	Son	Tinknocker	Norway
72	Lena Laskey	34	Daughter	—	Mass
73	Kenneth Laskey	14	Grandson	0	Mass
74	Edmond Boisvert	35	Head	Foreman	Mass
75	Aurore Boisvert	41	Wife	—	Canada French
76	Lucien Lebel	21	Son	Handler	Lowell
77	Charles E Mahoney	43	Head	Patrolman	Ireland
78	Catherine Mahoney	43	Wife	—	Canada English
79	Aaron Norris	51	Head	Sweeper	Vermont
80	Nina Norris	50	Wife	—	Connecticut

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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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