Mary Mccormick — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Allegheny-County, Pennsylvania

Our Model Tree links this Mary Mccormick across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a spouse (b.~1881), then head of a 5-person household.

Age 59 b. ~1881 Female Spouse Born: Ohio Married

1940 Census Record Details

Census Year	1940
Location	Allegheny-County, Pennsylvania
Surname	McCormick
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	59
Marital Status	Married
Birthplace	Ohio
1935 Residence (City)	Pittsburgh
1935 Residence (County)	Allegheny
Additional Details
Income (1939)	0
Highest Grade	No 8
1935 Residence	Same place
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio
Township / Ward	Pittsburgh
Est. Birth Year	~1881

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.

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

Name	Relation to head	Relative to Mary	Age	Birth yr
Matthew Mccormick	Head	—	65	~1875
William Schneider	Other	—	45	~1895
Robert Mccormick	Son	—	21	~1919
Raymond Mccormick	Son	—	28	~1912
Mary Mccormick	Spouse	—	59	~1881

Census Appearances

1920

Allegheny, Pennsylvania

Spouse, age 37

Allegheny, Pennsylvania · implied b. ~1883 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	McCormick
Given Name	Mary E.
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	37
Marital Status	Married
Birthplace	Ohio
Father's Birthplace	Pennsylvania
Mother's Birthplace	Ohio
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

1930

Allegheny, Pennsylvania

Spouse, age 48

Allegheny, Pennsylvania · implied b. ~1882 — 5 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	McCormick
Given Name	Mary E.
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	48
Marital Status	Married
Birthplace	Ohio
Age at First Marriage	18
Father's Birthplace	Ohio
Mother's Birthplace	Ohio
Can Read/Write	Yes
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

1940

Allegheny-County, Pennsylvania

Spouse, age 59

Allegheny-County, Pennsylvania · implied b. ~1881 — 5 household members

Surname	McCormick
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	59
Marital Status	Married
Birthplace	Ohio
1935 Residence (City)	Pittsburgh
1935 Residence (County)	Allegheny
Income (1939)	0
Highest Grade	No 8
1935 Residence	Same place
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

Model Tree

Linked across censuses

Our Model Tree links Mary Mccormick 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 Mccormick

Spouse · 1940 · age 59 · b. ~1881 · Pennsylvania

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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 — Allegheny-County, Pennsylvania Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-03668-00536)

Line	Name	Age	Relation	Occupation	Birthplace
1	Harry Crock	56	Brother	Fireman	Penna.
2	Elizabeth Crock	54	Sister	—	Penna.
3	Carl Crock	38	Brother	Laborer	Penna.
4	Matthew Mccormick	65	Head	Laborer	Illinois
5	Mary Mccormick THIS PERSON	59	Wife	—	Ohio
6	Raymond Mccormick	28	Son	Core Maker	Penna.
7	Robert Mccormick	21	Son	Laborer	Ohio
8	William Schneider	45	Lodger	Manager	Penna.
9	William W. Humphries	33	Head	Floor Manager	Indiana
10	Florine Humphries	30	Wife	—	Indiana
11	William Humphries	6	Son	—	Ohio
12	Nancy L. Humphries	4	Daughter	—	S. Carolina
13	Harry A. Macconnell	58	Head	Salesman	New York
14	Mary Macconnell	56	Wife	—	Penna.
15	Lydia Merkle	75	Head	—	Penna.
16	Hugh Cooper	44	Son in law	Foreman	Penna.
17	Ora Cooper	46	Daughter	—	Penna.
18	Jane Cooper	12	Granddaughter	—	Penna.
19	Charles A. Goodwin	45	Son in law	Salesman	Penna.
20	Mabel Goodwin	54	Daughter	—	Penna.
21	Douglas Goodwin	11	Grandson	—	Penna.
22	George W. Gamrod	37	Head	Clerk	Penna.
23	Anna Gamrod	32	Wife	—	Penna.
24	Willard Marr	32	Head	Policeman	Penna.
25	Agatha Marr	29	Wife	Clerk	Penna.
26	Alphonse Sylvain	49	Head	Steamfitter	Canada
27	Caroline B. Sylvain	56	Wife	—	Penna.
28	Marie M. Lippert	46	Mother in law	—	Penna.
29	William F. Kaiser	49	Head	Paper Hanger	Penna.
30	Clara A. Kaiser	50	Wife	—	Germany
31	Charles C. Manning	46	Head	Printer	Penna.
32	Anna E. Manning	47	Wife	—	Penna.
33	Charles C. Jr. Manning	23	Son	Truck Helper	Penna.
34	Ruth C. Manning	21	Daughter	New Worker	Penna.
35	Grace E. Manning	19	Daughter	Stenographer	Penna.
36	George Manning	13	Son	—	Penna.
37	James Manning	8	Son	—	Penna.
38	Josephine Geoff	43	Head	Waitress	Penna.
39	William Geoff	18	Son	Painter	Penna.
40	Helen Rouse	22	Niece	Stenographer	Ohio

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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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