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James Costello — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Loudoun-County, Virginia

Our Model Tree links this James Costello across the 1930 and 1940 US Censuses in Loudoun-County, Virginia (XGBoost, ~Confirmed) — first a son (b.~1926), then head of a 8-person household.

Age 14 b. ~1926 Male Son Born: Virginia Single

1940 Census Record Details

Census Year1940
LocationLoudoun-County, Virginia
SurnameCostello
Given NameJames
Relationship to HeadSon
SexM
Color / RaceWhite
Age14
Marital StatusSingle
BirthplaceVirginia
1935 Residence (City)R
1935 Residence (County)Loudoun
Additional Details
OccupationMilker
IndustryDairy Farm
Class of WorkerPW
Hours Worked6
Income (1939)52
Highest GradeNo 7
1935 ResidenceVirginia
Birth StateVirginia
Birth CountryUnited States
Birthplace (normalized)virginia
OccupationMilker
Township / WardJefferson Dist
Est. Birth Year~1926

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 James Age Birth yr
Mary Costello Daughter — 3 ~1937
Clinton Costello Son — 11 ~1929
Oliver Costello Head — 41 ~1899
James Costello Son — 14 ~1926
Hattie Costello Spouse — 35 ~1905
Glaw Costello Son — 9 ~1931
Catherine Costello Daughter — 10 ~1930
Joyce Costello Daughter — 1 ~1939

Census Appearances

1930
Loudoun, Virginia
Son, age 4
Loudoun, Virginia · implied b. ~1926 — 5 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Costello
Given Name James A.
Relationship to Head Son
Sex M
Color / Race White
Age 4
Marital Status Single
Birthplace Virginia
Father's Birthplace Virginia
Mother's Birthplace Virginia
Occupation none
Can Read/Write No
Birth State Virginia
Birth Country United States
Birthplace (normalized) virginia
1940
Loudoun-County, Virginia
Son, age 14
Loudoun-County, Virginia · implied b. ~1926 — 8 household members
Surname Costello
Given Name James
Relationship to Head Son
Sex M
Color / Race White
Age 14
Marital Status Single
Birthplace Virginia
1935 Residence (City) R
1935 Residence (County) Loudoun
Occupation Milker
Industry Dairy Farm
Class of Worker PW
Hours Worked 6
Income (1939) 52
Highest Grade No 7
1935 Residence Virginia
Birth State Virginia
Birth Country United States
Birthplace (normalized) virginia

Model Tree

An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Linked across censuses
Our Model Tree links James Costello across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Costello
Son · 1940 · age 14 · b. ~1926 · Virginia
★ You are viewing this record
Sibling
Catherine Costello
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Glaw Costello
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joyce Costello
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clinton Costello
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Costello
Sibling · 1940 · age 3
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 — Loudoun-County, Virginia Open full size

Page Contents

38 people indexed on this census page (nara:1940:m-t0627-04274-00179)

Line Name Age Relation Occupation Birthplace
1 Mary Purcell 73 Head — Virginia
2 Patience A Purcell 48 Daughter — Virginia
3 Albert Purcell 42 Son Teacher Virginia
4 Lizzie Bacon 77 Sister — Virginia
5 Aubry W Willingham 54 Head Farmhand Virginia
6 Emma Willingham 54 Wife — Virginia
7 Clarence W Willingham 30 Son Farmhand Virginia
8 Gladys V Willingham 25 Daughter Farmhand Virginia
9 Earl A Willingham 22 Son Farmhand Virginia
10 Holmes R Willingham 17 Son Farmhand Virginia
11 Linda A Willingham 9 Daughter — Virginia
12 Susie S Bell 81 Head — Baltimore Md
13 William S Bell 48 Head Operator Virginia
14 Bessie L Bell 48 Wife — Virginia
15 Carl W Bell 24 Son Farmhand Virginia
16 Ruth L Bell 19 Daughter — Virginia
17 Mervin Mock 32 Head Dairyhand Virginia
18 Nellie F Mock 23 Wife — Virginia
19 Henry H Lanham 33 Head Farmhand Virginia
20 Eliza S Lanham 25 Wife — Virginia
21 Bettie Lanham 6 Daughter — Virginia
22 Henry W Lanham 5 Son — Virginia
23 Rosa F Lanham 1 Daughter — Virginia
24 Oliver Costello 41 Head Farmhand Virginia
25 Hattie S Costello 35 Wife — Virginia
26 James Costello THIS PERSON 14 Son Milker Virginia
27 Clinton Costello 11 Son — Virginia
28 Catherine Costello 10 Daughter — Virginia
29 Glaw S Costello 9 Son — Virginia
30 Mary J Costello 3 Daughter — Virginia
31 Joyce J Costello 1 Daughter — Virginia
32 Otis R Williams 68 Head Operator Maryland
33 Glass L Williams 63 Wife — Virginia
34 Vernie Jackson 66 Maid Maid Virginia
35 Ernest W Dodson 24 Head Laborer Virginia
36 Jessie E Dodson 24 Wife — Virginia
37 Grace V Dodson 8 Daughter — Virginia
38 Gladys P Dodson 5 Daughter — Virginia

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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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