John Grady — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · New-Castle-County, Delaware

Our Model Tree links this John Grady across the 1930 and 1940 US Censuses in New-Castle-County, Delaware (XGBoost, ~Confirmed) — first a son (b.~1910), then head of a 8-person household.

Age 30 b. ~1910 Male Son Born: Delaware Single

1940 Census Record Details

Census Year	1940
Location	New-Castle-County, Delaware
Surname	Grady
Given Name	John A
Relationship to Head	Son
Sex	M
Color / Race	White
Age	30
Marital Status	Single
Birthplace	Delaware
1935 Residence (City)	Wilmington
1935 Residence (County)	New Castle
Additional Details
Occupation	Printer
Industry	Printing Bus.
Class of Worker	PW
Hours Worked	40
Income (1939)	310
Highest Grade	Hs 4
1935 Residence	Same House
Birth State	Delaware
Birth Country	United States
Birthplace (normalized)	delaware
Occupation	Printer
Township / Ward	Wilmington
Est. Birth Year	~1910

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.

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

Name	Relation to head	Relative to John	Age	Birth yr
Mary Harrington	Spouse	—	25	~1915
John Grady	Son	—	30	~1910
Mary Grady	Spouse	—	65	~1875
Francis Grady	Son	—	27	~1913
Edward Grady	Son	—	19	~1921
John Grady	Head	—	67	~1873
Joseph Harrington	Other	—	32	~1908
James Jones	Other	—	60	~1880

Census Appearances

1930

New Castle, …

Son, age 20

New Castle, Delaware · implied b. ~1910 — 9 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Grady
Given Name	John A.
Relationship to Head	Son
Sex	M
Color / Race	White
Age	20
Marital Status	Single
Birthplace	Delaware
Father's Birthplace	Delaware
Mother's Birthplace	Delaware
Occupation	Printer
Industry	Shop 0769
Class of Worker	W
Can Read/Write	Yes
Birth State	Delaware
Birth Country	United States
Birthplace (normalized)	delaware

1940

New-Castle-County, Delaware

Son, age 30

New-Castle-County, Delaware · implied b. ~1910 — 8 household members

Surname	Grady
Given Name	John A
Relationship to Head	Son
Sex	M
Color / Race	White
Age	30
Marital Status	Single
Birthplace	Delaware
1935 Residence (City)	Wilmington
1935 Residence (County)	New Castle
Occupation	Printer
Industry	Printing Bus.
Class of Worker	PW
Hours Worked	40
Income (1939)	310
Highest Grade	Hs 4
1935 Residence	Same House
Birth State	Delaware
Birth Country	United States
Birthplace (normalized)	delaware

Model Tree

Linked across censuses

Our Model Tree links John Grady across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.

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This person

Anchor record

John Grady

Son · 1940 · age 30 · b. ~1910 · Delaware

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Sibling

Edward Grady

Sibling · 1940 · age 19

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Francis Grady

Sibling · 1940 · age 27

Source co-child of head (derived)

● Co-child · derived · ~0.88

Confirmed / household (~0.90+) Probable / derived (~0.65–0.89) Candidate (<0.65, unverified)

Original Census Page

1940 US Federal Census — New-Castle-County, Delaware Open full size

Page Contents

39 people indexed on this census page (nara:1940:m-t0627-00551-00359)

Line	Name	Age	Relation	Occupation	Birthplace
41	Matt Fink	32	Lodger	Clerk	Jersey
42	Maurice A Manning	73	Head	—	New York
43	Elizabeth Manning	62	Wife	—	Delaware
44	Willard S Sigley	40	Son in Law	Salesman	Delaware
45	Mabel E Sigley	72	Wife	—	Delaware
46	Harry Kenyon	59	Brother	Wholesale Tobacco	Delaware
47	Frank Vinci	51	Head	50	Italy
48	Anna M Vinci	50	Wife	—	Pa
49	Carmelina J Vinci	23	Daughter	Soda Clerk	Delaware
50	Louise Marie Vinci	21	Daughter	Ass. Manager	Delaware
51	Francis V Vinci	22	Son	Laborer	Delaware
52	Henry J Vinci	17	Son	—	Delaware
53	Harvey J Connelly	44	Head	Clerk	Delaware
54	Jennie G Connelly	37	Wife	—	Delaware
55	Marie J Connelly	18	Daughter	—	Delaware
56	Curtis A Diamond	45	Brother in Law	—	Delaware
57	Isabelle G Diamond	33	Sister	—	Delaware
58	James V Tegani	21	Head	Clerk	Delaware
59	Betty E Tegani	20	Wife	—	Delaware
60	James V Jr. Tegani	3	Son	—	Delaware
61	F. J. Jr. Seigler	28	Head	Elec. Inspector	Georgia
62	Mary S Seigler	25	Wife	—	Georgia
63	Herbert Levitt	23	Head	Salesman Jewelry	Maryland
64	Evelyn R. Levitt	20	Wife	—	Pa
65	William C Gillespie	75	Head	—	Maryland
66	Mary E Gillespie	69	Wife	—	Pa
67	Richard E Logue	20	Grandson	Undertaker	Delaware
68	John H Grady	67	Head	—	Delaware
69	Mary E Grady	65	Wife	—	Delaware
70	John A Grady THIS PERSON	30	Son	Printer	Delaware
71	Francis J Grady	27	Son	Chemist	Delaware
72	Edward J Grady	19	Son	—	Delaware
73	James Jones	60	Boarder	—	Delaware
74	Joseph T Harrington	32	Son in Law	Clerk Mail	Delaware
75	Mary A Harrington	25	Wife	Bookkeeper	Delaware
76	Emil S Vahl	47	Head	60	Russia
77	Bella Vahl	42	Wife	0	Russia
78	Robert H Vahl	20	Son	—	Delaware
79	Betty Vahl	18	Daughter	—	Delaware

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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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