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John Costello — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Denver-County, Colorado
Our Model Tree links this John Costello across the 1920, 1930 and 1940 US Censuses in Denver-County, Colorado (XGBoost, ~Confirmed) — first a head (b.~1915), then head of a 3-person household.
Age 25
b. ~1915
Male
Head
Born: Colorado
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Denver-County, Colorado |
| Surname | Costello |
| Given Name | John, H |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Colorado |
| 1935 Residence (City) | Denver |
| 1935 Residence (County) | Denver |
| Additional Details | |
| Occupation | Truck driver |
| Industry | Packing Co |
| Class of Worker | PW |
| Hours Worked | 52 |
| Income (1939) | 1300 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Truck Driver |
| Township / Ward | Denver |
| Est. Birth Year | ~1915 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| John Costello | Head | — | 25 | ~1915 |
| Edith Costello | Spouse | — | 20 | ~1920 |
| Elizabeth Costello | Daughter | — | ~1940 |
Census Appearances
1920
Denver, Colorado
Other, age 4
Denver, Colorado · implied b. ~1916 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | John |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Colorado |
| Mother's Birthplace | Colorado |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1930
Denver, Colorado
Other, age 15
Denver, Colorado · implied b. ~1915
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Costello |
| Given Name | John H. |
| Relationship to Head | Step-son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Colorado |
| Mother's Birthplace | Colorado |
| Can Read/Write | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Denver-County, Colorado
Head, age 25
Denver-County, Colorado · implied b. ~1915 — 3 household members
| Surname | Costello |
| Given Name | John, H |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Colorado |
| 1935 Residence (City) | Denver |
| 1935 Residence (County) | Denver |
| Occupation | Truck driver |
| Industry | Packing Co |
| Class of Worker | PW |
| Hours Worked | 52 |
| Income (1939) | 1300 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 John Costello across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Costello
Head · 1940 · age 25 · b. ~1915 · Colorado
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Denver-County, Colorado
Open full size
1940 US Federal Census — Denver-County, Colorado
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00493-00272)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Leon, W Duncan | 19 | son | Electrician | Colorado |
| 2 | Howard, D Duncan | 13 | son | — | Colorado |
| 3 | Katherine Connolly | 59 | Head | — | Ireland |
| 4 | Mae, A Connolly | 32 | daughter | Bookkeeper | Maine |
| 5 | Patricia, A Connolly | 18 | daughter | Telephone Operator | Colorado |
| 6 | Daniel, S Connolly | 24 | son | Bakers Helper | Colorado |
| 7 | Earl Hansen | 39 | Head | Clerk | Colorado |
| 8 | Anna Hansen | 29 | Wife | — | Colorado |
| 9 | Claudia Hansen | 4 | daughter | — | Colorado |
| 10 | Anna Besser | 84 | Head | — | Kansas |
| 11 | Emile Cager | 61 | daughter | — | Kansas |
| 12 | Archie, G Cager | 72 | son-in-law | Manager | Arkansas |
| 13 | Almer, N Fourcade | 60 | nephew | Salesman | Kansas |
| 14 | Allen, C Olmsted | 41 | Head | Butcher | Colorado |
| 15 | Clara, G Olmsted | 43 | Wife | — | Missouri |
| 16 | Dorothy, M Olmsted | 15 | daughter | Waitress | Colorado |
| 17 | Allen, Jr Olmsted | 15 | son | — | Colorado |
| 18 | Kenneth Olmsted | 13 | son | — | Colorado |
| 19 | Eddie Rineait | Rinealt | 55 | Head | Railroad Inspector | W. Virginia |
| 20 | Ollie Rineait | Rinealt | 50 | Wife | — | W. Virginia |
| 21 | Leonora Rineait | Rinealt | 25 | daughter | Ice Cream Wrapper | W. Virginia |
| 22 | John, A Plake | 23 | Head | Pressman | Nebraska |
| 23 | Ida Plake | 19 | Wife | — | Missouri |
| 24 | Gaylord Plake | 1 | son | — | Colorado |
| 25 | Paul Darner | 27 | Lodger | Press Man | Oklahoma |
| 26 | Ella, N Darner | 23 | Lodger | — | Missouri |
| 27 | John Darner | 0 | Lodger | — | Colorado |
| 28 | Theo, W. R. Scholz | 57 | Head | Baker | Germany |
| 29 | Evelyn Louise Scholz | 15 | daughter | — | Colorado |
| 30 | Mary Brady | 77 | Head | — | Ireland |
| 31 | — | None | — | — | — |
| 32 | Hugh, S. Brady | 43 | son | Butcher | Oklahoma |
| 33 | John, H Costello THIS PERSON | 25 | Head | Truck Driver | Colorado |
| 34 | Edith Costello | 20 | Wife | — | Colorado |
| 35 | Elizabeth Costello | 0 | daughter | — | Colorado |
| 36 | Joseph Mosher | 54 | Head | Machinist | Michigan |
| 37 | Anna Mosher | 49 | Wife | — | Illinois |
| 38 | Joseph Mosher | 11 | son | — | Colorado |
| 39 | Jack, E. Bethel | 45 | Head | Salesman | Missouri |
| 40 | Judith Bethel | 38 | Wife | — | Colorado |
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)