JC
John Cox — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Cox across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1920), then head of a 7-person household.
Age 20
b. ~1920
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Cox |
| Given Name | John Jr |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Striker |
| Industry | Cattle |
| Class of Worker | PW |
| Hours Worked | 16 |
| Income (1939) | 350 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Striker |
| Township / Ward | Boston |
| 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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Madeline Cox | Daughter | — | 17 | ~1923 |
| Eleanor Cox | Daughter | — | 14 | ~1926 |
| John Cox | Head | — | 48 | ~1892 |
| Edward Cox | Son | — | 9 | ~1931 |
| Herbert Cox | Son | — | 12 | ~1928 |
| John Cox | Son | — | 20 | ~1920 |
| Ella Cox | Spouse | — | 47 | ~1893 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age
Suffolk, Massachusetts · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Son, age 10
Suffolk, Massachusetts · implied b. ~1920 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | John J Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | New York State |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 20
Suffolk-County, Massachusetts · implied b. ~1920 — 7 household members
| Surname | Cox |
| Given Name | John Jr |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Occupation | Striker |
| Industry | Cattle |
| Class of Worker | PW |
| Hours Worked | 16 |
| Income (1939) | 350 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Cox across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Cox (~0.92 confidence) and father John Cox (~0.92 confidence) and father John Cox (~0.92 confidence) and mother Ella Cox (~0.92 confidence) and mother Ella Cox (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Cox
b. ~1880
Source father
● Household
· direct · ~0.92
Father
John Cox
b. ~1892
Source father
● Household
· direct · ~0.92
Father
John Cox
b. ~1893
Source father
● Household
· direct · ~0.92
Mother
Ella Cox
b. ~1893
Source mother
● Household
· direct · ~0.92
Mother
Ella Cox
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Cox
Son · 1940 · age 20 · b. ~1920 · Massachusetts
★ You are viewing this record
Sibling
Madeline Cox
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herbert Cox
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eleanor Cox
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Cox
Sibling · 1940 · age 9
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01682-00298)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mabel J Maclean | 7 | son | — | Massachusetts |
| 2 | Maria M Maclean | 5 | daughter | — | Massachusetts |
| 3 | Donald Maclean | 1 | son | — | Massachusetts |
| 4 | James L Thompson | 27 | lodger | Carpenter | Massachusetts |
| 5 | Helen M Thompson | 26 | lodger | — | Massachusetts |
| 6 | James L Jr Thompson | 9 | lodger | — | New Hampshire |
| 7 | Father Thompson | 1 | lodger | — | Massachusetts |
| 8 | John Cox | 48 | head | Herdsman | Massachusetts |
| 9 | Ella Cox | 47 | wife | — | Massachusetts |
| 10 | John Jr Cox THIS PERSON | 20 | son | Striker | Massachusetts |
| 11 | Madeline Cox | 17 | daughter | — | Massachusetts |
| 12 | Eleanor Cox | 14 | daughter | — | Massachusetts |
| 13 | Herbert Cox | 12 | son | — | Massachusetts |
| 14 | Edward Cox | 9 | son | — | Massachusetts |
| 15 | William H Murphy | 54 | head | Conductor | Massachusetts |
| 16 | Ada Murphy | 49 | wife | — | Rhode Island |
| 17 | John Murphy | 32 | son | Foreman Floor | Massachusetts |
| 18 | Edith Murphy | 27 | daughter | Kit Room Asst | Massachusetts |
| 19 | Richard Murphy | 25 | son | Laborer | Massachusetts |
| 20 | Virginia Murphy | 22 | daughter | Ice Cream Worker | Massachusetts |
| 21 | Marjory Murphy | 19 | daughter | New Worker | Massachusetts |
| 22 | Robert Murphy | 16 | son | New Worker | Massachusetts |
| 23 | Robert Murphy | 14 | son | — | Massachusetts |
| 24 | Barbara Murphy | 12 | daughter | — | Massachusetts |
| 25 | Paul Murphy | 10 | son | — | Massachusetts |
| 26 | William Keane | 29 | head | Spray Painter | Rhode Island |
| 27 | Emma Keane | 30 | wife | — | Massachusetts |
| 28 | Patricia Keane | 4 | daughter | — | Massachusetts |
| 29 | William Jr Keane | 2 | son | — | Massachusetts |
| 30 | John Mahoney | 68 | head | — | Irish Free State |
| 31 | Alice Mahoney | 55 | wife | — | Irish Free State |
| 32 | Mary Keane | 65 | mother-in-law | — | Irish Free State |
| 33 | Mario Petroini | 44 | head | Laborer | Italy |
| 34 | Carmella Petroini | 39 | wife | — | Italy |
| 35 | Bruno Petroini | 16 | son | — | Massachusetts |
| 36 | Albert Petroini | 12 | son | — | Massachusetts |
| 37 | Ernest Petroini | 10 | son | — | Massachusetts |
| 38 | Charles S Donovan | 44 | head | Lawyer | Massachusetts |
| 39 | Bessie T Donovan | 42 | wife | — | Massachusetts |
| 40 | Betty P Donovan | 20 | daughter | — | Massachusetts |
Pedigree Summary
John + 4 siblings
Gen 1 · 5 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)