Mary Carlson — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Worcester-County, Massachusetts

Our Model Tree links this Mary Carlson across the 1920, 1930 and 1940 US Censuses in Worcester-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1897), then head of a 3-person household.

Age 43 b. ~1897 Female Head Born: Finland Widowed

1940 Census Record Details

Census Year	1940
Location	Worcester-County, Massachusetts
Surname	Carlson
Given Name	Mary
Relationship to Head	Head
Sex	F
Color / Race	White
Age	43
Marital Status	Widowed
Birthplace	Finland
1935 Residence (City)	Worcester City
1935 Residence (County)	Worcester
Naturalization Status	First papers filed
Additional Details
Highest Grade	No 8
1935 Residence	Same place
Birth Country	Finland
Birthplace (normalized)	finland
Township / Ward	Worcester City
Est. Birth Year	~1897

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
Mary Carlson	Head	—	43	~1897
Carl Carlson	Son	—	17	~1923
Evelyn Carlson	Daughter	—	21	~1919

Census Appearances

1920

Worcester, Massachusetts

Other, age 25

Worcester, Massachusetts · implied b. ~1895 — 2 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Carlson
Given Name	Mary
Relationship to Head	Boarder
Sex	F
Color / Race	White
Age	25
Marital Status	Single
Birthplace	Finland
Year of Immigration	1917
Naturalization Status	Alien
Father's Birthplace	Finland
Mother's Birthplace	Finland
Occupation	Cook
Industry	Chair factory
Class of Worker	W
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	Swedish
Birth Country	Finland
Birthplace (normalized)	finland

1930

Worcester, Massachusetts

Other, age 33

Worcester, Massachusetts · implied b. ~1897 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Carlson
Given Name	Mary E.
Relationship to Head	Head-H
Sex	F
Color / Race	White
Age	33
Marital Status	Widowed
Birthplace	Finland
Naturalization Status	First papers filed
Year of Immigration	1917
Age at First Marriage	21
Father's Birthplace	Finland
Mother's Birthplace	Finland
Occupation	Housework
Industry	Private family
Class of Worker	W
Can Read/Write	Yes
Mother Tongue	Finnish
Home Owned/Rented	R
Home Value / Rent	22
Birth Country	Finland
Birthplace (normalized)	finland

1940

Worcester-County, Massachusetts

Head, age 43

Worcester-County, Massachusetts · implied b. ~1897 — 3 household members

Surname	Carlson
Given Name	Mary
Relationship to Head	Head
Sex	F
Color / Race	White
Age	43
Marital Status	Widowed
Birthplace	Finland
1935 Residence (City)	Worcester City
1935 Residence (County)	Worcester
Naturalization Status	First papers filed
Highest Grade	No 8
1935 Residence	Same place
Birth Country	Finland
Birthplace (normalized)	finland

Model Tree

Linked across censuses

Our Model Tree links Mary Carlson 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 Carlson

Head · 1940 · age 43 · b. ~1897 · 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 — Worcester-County, Massachusetts Open full size

Page Contents

38 people indexed on this census page (nara:1940:m-t0627-01718-00907)

Line	Name	Age	Relation	Occupation	Birthplace
1	John Stefan	68	Head	Laster	Albania
2	Constantina Stefan	50	Wife	—	Albania
3	Angelo Adams	29	Step son	Shoe Co	Mass.
4	Elizabeth Stefan	19	Daughter	—	Mass.
5	Bernice Stefan	18	Son	—	Mass.
6	Violet Stefan	8	Daughter	—	Mass.
7	Mary Carlson THIS PERSON	43	Head	—	Finland
8	Evelyn Carlson	21	Daughter	Foundry	Mass.
9	Carl R. Carlson	17	Son	Foundry	Mass.
10	Loretta Slancy	37	Head	—	Canada-French
11	Elena Slancy	18	Daughter	—	Mass.
12	Frederick Slancy	14	Son	—	Mass.
13	Richard Slancy	10	Son	—	Mass.
14	Thomas Williams	65	Head	Yard Master	Pennsylvania
15	Francis Williams	34	Son	B. & M. R.R.	Mass.
16	Edward J. Hearn	65	Head	Government	Mass.
17	Margaret Hearn	61	Wife	—	Ireland Free State
18	Katharine Hearn	34	Daughter	Wholesale Meat	Mass.
19	Katherine Hearn	88	Mother	—	Ireland Free State
20	Ellen Hearn	49	Sister	—	Mass.
21	Katherine Taylor	41	Head	—	Mass.
22	Ethel Taylor	19	Daughter	Bakery	Mass.
23	Dorothy Taylor	16	Daughter	—	Mass.
24	Mary Asphalt	82	Head	—	Ireland Free State
25	Hannah Coyle	72	Sister	Matron	Ireland-No.
26	William Griffin	40	Nephew	—	Mass.
27	Emile Lelauris	47	Head	Carpenter	Canada-French
28	Rose Lelauris	46	Wife	—	Canada-French
29	Dolores Lelauris	22	Daughter	Packer	Canada-French
30	Irene Lelauris	21	Daughter	Mechanic	Canada-French
31	Rita Lelauris	19	Daughter	—	Canada-French
32	Madeline Lelauris	16	Daughter	—	Lawrence, Mass.
33	Theresa Lelauris	14	Daughter	—	Mass.
34	Lorraine Lelauris	11	Daughter	—	Mass.
35	Jeanette Lelauris	9	Daughter	—	Mass.
36	Clarence Carey	31	Head	Laster	Canada-French
37	Fernane Carey	33	Wife	—	France
38	Patricia Carey	0	Daughter	—	Mass.

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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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