Mary Costello — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Cuyahoga-County, Ohio

Our Model Tree links this Mary Costello across the 1920, 1930 and 1940 US Censuses in Cuyahoga-County, Ohio (XGBoost, ~Confirmed) — first a spouse (b.~1880), then head of a 7-person household.

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

1940 Census Record Details

Census Year	1940
Location	Cuyahoga-County, Ohio
Surname	Costello
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	60
Marital Status	Married
Birthplace	Ohio
1935 Residence (City)	Cleveland City
1935 Residence (County)	Cuyahoga
Additional Details
Class of Worker	0
Highest Grade	H 8
1935 Residence	Same house
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio
Township / Ward	Cleveland City
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.

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

Name	Relation to head	Relative to Mary	Age	Birth yr
Cathrien Costello	Daughter	—	31	~1909
Coletta Costello	Daughter	—	23	~1917
Timothy Costello	Head	—	61	~1879
William Costello	Son	—	27	~1913
Daniel Costello	Son	—	34	~1906
Timothy Costello	Son	—	25	~1915
Mary Costello	Spouse	—	60	~1880

Census Appearances

1920

Cuyahoga, Ohio

Spouse, age 39

Cuyahoga, Ohio · implied b. ~1881 — 10 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Costello
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	39
Marital Status	Married
Birthplace	Ohio
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

1930

Cuyahoga, Ohio

Other, age 50

Cuyahoga, Ohio · implied b. ~1880 — 8 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Costello
Given Name	Mary
Relationship to Head	Wife-H
Sex	F
Color / Race	White
Age	50
Marital Status	Married
Birthplace	Ohio
Age at First Marriage	23
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Occupation	none
Can Read/Write	Yes
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

1940

Cuyahoga-County, Ohio

Spouse, age 60

Cuyahoga-County, Ohio · implied b. ~1880 — 7 household members

Surname	Costello
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	60
Marital Status	Married
Birthplace	Ohio
1935 Residence (City)	Cleveland City
1935 Residence (County)	Cuyahoga
Class of Worker	0
Highest Grade	H 8
1935 Residence	Same house
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

Model Tree

Linked across censuses

Our Model Tree links Mary Costello 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 Costello

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

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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 — Cuyahoga-County, Ohio Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-03203-00553)

Line	Name	Age	Relation	Occupation	Birthplace
41	Anne Parozek	19	Sister	Clerk	Ohio
42	Sophia Parozek	52	Mother	—	Hungary
43	Charles Addison	61	Head	Steward	Michigan
44	Ida Addison	60	Wife	—	Iowa
45	Paul Olam	57	Lodger	Seamstress	Iowa
46	Michael Sanka	62	Head	Machinist	Austria
47	Mary Sanka	63	Wife	—	Austria
48	Irene Sanka	30	Daughter	Stenographer	Ohio
49	Elsie Sanka	28	Daughter	Stenographer	Ohio
50	Olga Sanka	25	Daughter	Clerk-Typist	Ohio
51	William F. Thumm	49	Head	Salesman	Ohio
52	Verna A. Thumm	41	Wife	—	Ohio
53	Harold A. Thumm	22	Son	Clerk	Ohio
54	Gordon O. Thumm	19	Son	Electrician	Ohio
55	Olive L. Thumm	16	Daughter	—	Ohio
56	Fern D. Thumm	12	Daughter	—	Ohio
57	Timothy Costello	61	Head	Policeman	Ohio
58	Mary Costello THIS PERSON	60	Wife	—	Ohio
59	Daniel Costello	34	Son	Cashier	Ohio
60	Cathrien Costello	31	Daughter	Clerk	Ohio
61	William Costello	27	Son	Cashier	Ohio
62	Timothy Costello	25	Son	Salesman	Ohio
63	Coletta Costello	23	Daughter	Nurse	Ohio
64	Charles B. Davis	70	Head	—	New York
65	Mary Davis	59	Wife	—	Irish Free State
66	Paul Davis	35	Son	Inspector	Ohio
67	Marion Davis	31	Daughter	Dispatcher	Ohio
68	Charles Davis	28	Son	Laborer	Ohio
69	Jane Davis	22	Daughter	Stenographer	Ohio
70	William Lawson	48	Head	Press Operator	Ohio
71	Minnie Lawson	46	Wife	Tailor	Ohio
72	Madge Roemer	26	Daughter-in-law	Nurse	Ohio
73	Bryant Roemer	24	Son	Mechanic	Ohio
74	Anna Colcher	68	Mother-in-law	Maid	Ohio
75	Janet Roemer	1	Daughter	—	Ohio
76	Joseph A. Horwedel	56	Head	Janitor	Ohio
77	Ann Horwedel	50	Wife	—	Ohio
78	Kenneth Horwedel	28	Son	Clerical	Ohio
79	Cathrine Horwedel	24	Wife	Demonstrator	Ohio
80	Extra Line	None	—	—	—

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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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