JC
James Costello — 1940 US Census Record
Model Tree available1940 United States Federal Census · St.-Clair-County, Missouri
Our Model Tree links this James Costello across the 1920, 1930 and 1940 US Censuses in St.-Clair-County, Missouri (XGBoost, ~Confirmed), with identified parents Terrence & Marcella — first a son (b.~1905), then head of a 3-person household.
Age 35
b. ~1905
Male
Son
Born: Missouri
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Clair-County, Missouri |
| Surname | Costello |
| Given Name | James E. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Speedwell twp |
| 1935 Residence (County) | St Clair |
| Additional Details | |
| Occupation | farmer |
| Industry | farm |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 0 |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Occupation | Farmer |
| Township / Ward | Speedwell Twp |
| Est. Birth Year | ~1905 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| James Costello | Son | — | 35 | ~1905 |
| Mary Costello | Daughter | — | 40 | ~1900 |
| Terrence Costello | Head | — | 70 | ~1870 |
Census Appearances
1920
St Clair, …
Son, age 14
St Clair, Missouri · implied b. ~1906 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Castillo |
| Given Name | James G. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1930
St Clair, …
Son, age 24
St Clair, Missouri · implied b. ~1906 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | James E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Occupation | Farm hand |
| Industry | General farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
St.-Clair-County, Missouri
Son, age 35
St.-Clair-County, Missouri · implied b. ~1905 — 3 household members
| Surname | Costello |
| Given Name | James E. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Speedwell twp |
| 1935 Residence (County) | St Clair |
| Occupation | farmer |
| Industry | farm |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 0 |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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.
Our Model Tree links James Costello across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Terrence Costello (~0.92 confidence) and mother Marcella Costello (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Terrence Costello
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Marcella Costello
b. ~1874
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Costello
Son · 1940 · age 35 · b. ~1905 · Missouri
★ You are viewing this record
Sibling
Mary Costello
Sibling · 1940 · age 40
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 — St.-Clair-County, Missouri
Open full size
1940 US Federal Census — St.-Clair-County, Missouri
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02145-01101)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lloyd Dever | 19 | son | Farmer | Missouri |
| 2 | Terrence W. Costello | 70 | Head | Farmer | Missouri |
| 3 | Mary Costello | 40 | daughter | Graduate Nurse | Missouri |
| 4 | James E. Costello THIS PERSON | 35 | son | Farmer | Missouri |
| 5 | Pearl H. Fowler | 29 | Head | Farmer | Missouri |
| 6 | Ruby Irene Fowler | 28 | wife | — | Missouri |
| 7 | Robert Ainslee Fowler | 6 | son | — | Missouri |
| 8 | Charles Edward Fowler | 12 | son | — | Missouri |
| 9 | Dave Combs | 35 | Head | Farmer | Missouri |
| 10 | Genevieve Combs | 37 | wife | — | Kansas |
| 11 | Harold Lee Combs | 14 | son | — | Missouri |
| 12 | John Bradley | 25 | Head | Farmer | Missouri |
| 13 | Mable Bradley | 43 | mother | — | Kansas |
| 14 | Ruth Edna Bradley | 19 | sister | — | Missouri |
| 15 | Samuel B. Bradley | 14 | brother | — | Missouri |
| 16 | John H. Flook | 69 | Head | — | Iowa |
| 17 | Neal Flook | 57 | wife | — | Arkansas |
| 18 | Ray Gresham | 24 | Head | Farm Labour | Missouri |
| 19 | Nora Francis Gresham | 22 | wife | — | Iowa |
| 20 | Helen Frances Gresham | 2 | daughter | — | Missouri |
| 21 | William S. Hogan | 27 | Head | Farm Labour | Missouri |
| 22 | Martha P. Hogan | 22 | wife | — | Arkansas |
| 23 | Billy S. Hogan | 4 | son | — | Missouri |
| 24 | Martha Faye Hogan | 2 | daughter | — | Missouri |
| 25 | Albert L. Viets | 62 | Head | Farmer | Wisconsin |
| 26 | Rosa Viets | 73 | wife | — | Missouri |
| 27 | Alfred Graham | 53 | Head | Farmer | Missouri |
| 28 | Erma Graham | 52 | wife | — | Iowa |
| 29 | Willis E. Friar | 64 | Head | Farmer | Missouri |
| 30 | Nellie I. Friar | 64 | wife | — | Missouri |
| 31 | Harrison E. Allen | 29 | Head | Farmer | Missouri |
| 32 | Verda Allen | 29 | wife | — | Missouri |
| 33 | Wilma Fern Allen | 7 | daughter | — | Missouri |
| 34 | Phyllis Joyce Allen | 4 | daughter | — | Missouri |
| 35 | Albert Mcdaniel | 43 | Head | Clerk | Missouri |
| 36 | Edith Mcdaniel | 28 | wife | — | Missouri |
| 37 | James N. Eason | 72 | Head | — | Missouri |
| 38 | Grace Eason | 62 | wife | — | Indiana |
| 39 | Laurence Alexander | 33 | Head | Farmer | Missouri |
| 40 | Rachel Alexander | 32 | wife | — | Missouri |
Pedigree Summary
James + 1 sibling
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)