JC
John Cahill — 1940 US Census Record
Model Tree available1940 United States Federal Census · Maricopa-County, Arizona
Our Model Tree links this John Cahill across the 1920, 1930 and 1940 US Censuses in Maricopa-County, Arizona (XGBoost, ~Confirmed), with identified parents Lola & Lola — first a son (b.~1920), then head of a 8-person household.
Age 20
b. ~1920
Male
Son
Born: Arizona
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Maricopa-County, Arizona |
| Surname | Cahill |
| Given Name | John, Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Arizona |
| 1935 Residence (City) | Phoenix city |
| 1935 Residence (County) | Maricopa |
| Additional Details | |
| Occupation | Carpenter |
| Industry | Building |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 704 |
| Highest Grade | H-3 |
| 1935 Residence | Same house |
| Birth State | Arizona |
| Birth Country | United States |
| Birthplace (normalized) | arizona |
| Occupation | Carpenter |
| Township / Ward | Phoenix City |
| Est. Birth Year | ~1920 |
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 |
|---|---|---|---|---|
| Lola Cahill | Spouse | — | 50 | ~1890 |
| George Cahill | Son | — | 19 | ~1921 |
| James Cahill | Son | — | 15 | ~1925 |
| Margaret Cahill | Daughter | — | 24 | ~1916 |
| John Cahill | Son | — | 20 | ~1920 |
| John Cahill | Head | — | 46 | ~1894 |
| Ann Cahill | Daughter | — | 26 | ~1914 |
| Georgia Cahill | Daughter | — | 19 | ~1921 |
Census Appearances
1920
Maricopa, Arizona
Son, age
Maricopa, Arizona · implied b. ~1920 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Arizona |
| Father's Birthplace | Mexico |
| Mother's Birthplace | Mexico |
| Occupation | none |
| Birth State | Arizona |
| Birth Country | United States |
| Birthplace (normalized) | arizona |
1930
Maricopa, Arizona
Son, age 11
Maricopa, Arizona · implied b. ~1919 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Mexican |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Arizona |
| Father's Birthplace | Mexico |
| Mother's Birthplace | Mexico |
| Can Read/Write | Yes |
| Birth State | Arizona |
| Birth Country | United States |
| Birthplace (normalized) | arizona |
1940
Maricopa-County, Arizona
Son, age 20
Maricopa-County, Arizona · implied b. ~1920 — 8 household members
| Surname | Cahill |
| Given Name | John, Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Arizona |
| 1935 Residence (City) | Phoenix city |
| 1935 Residence (County) | Maricopa |
| Occupation | Carpenter |
| Industry | Building |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 704 |
| Highest Grade | H-3 |
| 1935 Residence | Same house |
| Birth State | Arizona |
| Birth Country | United States |
| Birthplace (normalized) | arizona |
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 Cahill across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Lola Cahill (~0.92 confidence) and mother Lola Cahill (~0.92 confidence) and father John Cahill (~0.92 confidence) and father John Cahill (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Lola Cahill
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Lola Cahill
b. ~1892
Source mother
● Household
· direct · ~0.92
Father
John Cahill
b. ~1893
Source father
● Household
· direct · ~0.92
Father
John Cahill
b. ~1894
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Cahill
Son · 1940 · age 20 · b. ~1920 · Arizona
★ You are viewing this record
Sibling
Ann Cahill
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Cahill
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Cahill
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Cahill
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Georgia Cahill
Sibling · 1940 · age 19
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 — Maricopa-County, Arizona
Open full size
1940 US Federal Census — Maricopa-County, Arizona
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00105-00749)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Gerald Crawley | 22 | Guest | — | Arizona |
| 42 | Bevil Trotter | 47 | Head | Electric Engineer | Arkansas |
| 43 | Fannie Trotter | 44 | Wife | — | Texas |
| 44 | Welford Trotter | 24 | Son | Trucker | Oklahoma |
| 45 | Oma Wright | 20 | Daughter | — | Oklahoma |
| 46 | Monnedene Wright | 1 | Daughter | — | Arizona |
| 47 | Archie Trotter | 12 | Son | — | Oklahoma |
| 48 | Jerry Trotter | 5 | Son | — | Oklahoma |
| 49 | Extra Line Extra Line | None | — | — | — |
| 50 | Paul Clineto | 34 | Head | Salesman | Illinois |
| 51 | Mildred Clineto | 23 | Wife | — | Missouri |
| 52 | Terry Lee Clineto | 2 | Son | — | California |
| 53 | Victoria Butch | 28 | Head | Clerk | New York |
| 54 | Anna Strope | 78 | Grandmother | — | Lithuania |
| 55 | Charles Edw Mincks | 59 | Head | Manager Owner Apt House | Illinois |
| 56 | Laura Mincks | 51 | Wife | — | Arizona |
| 57 | Virginia Mincks | 15 | Daughter | — | Arizona |
| 58 | Extra Line Extra Line | None | — | — | — |
| 59 | Franklin H Owens | 59 | Head | Foreman City Street Department | Arizona |
| 60 | Lenora L Owens | 60 | Wife | — | Arizona |
| 61 | Kenneth M Cave | 26 | Head | Interior Decorator | Kansas |
| 62 | Luraetta Cave | 24 | Wife | — | Kansas |
| 63 | William R Cave | 2 | Son | — | Arizona |
| 64 | Carl E Becker | 23 | Head | House Painter | Oklahoma |
| 65 | Betty M Becker | 18 | Wife | — | Oklahoma |
| 66 | William P Heropp | 42 | Head | Carpenter | Pennsylvania |
| 67 | John Cahill | 46 | Head | Manager | Arizona |
| 68 | Lola M Cahill | 50 | Wife | — | Arizona |
| 69 | Ann M Cahill | 26 | Daughter | Saleslady | Arizona |
| 70 | Margaret Cahill | 24 | Daughter | — | Arizona |
| 71 | John, Jr Cahill THIS PERSON | 20 | Son | Carpenter | Arizona |
| 72 | Georgia Cahill | 19 | Daughter | — | Arizona |
| 73 | George Cahill | 19 | Son | — | Arizona |
| 74 | James Cahill | 15 | Son | — | Arizona |
| 75 | Fred G Dobbs | 55 | Head | Manager Own Store | Illinois |
| 76 | Dena Dobbs | 50 | Wife | Saleslady | Illinois |
| 77 | Rosie Dobbs | 28 | Daughter | Saleslady | Illinois |
| 78 | Ross Anderson | 21 | Lodger | Plumber | Illinois |
| 79 | Extra Line Extra Line | None | — | — | — |
| 80 | Extra Line Extra Line | None | — | — | — |
Related Census Records
Pedigree Summary
John + 5 siblings
Gen 1 · 4 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)