JC
John Cobb — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Plymouth-County, Massachusetts
Our Model Tree links this John Cobb across the 1930 and 1940 US Censuses in Plymouth-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 9-person household.
Age 10
b. ~1930
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Plymouth-County, Massachusetts |
| Surname | Cobb |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Brockton city |
| 1935 Residence (County) | Plymouth |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Brockton City |
| Est. Birth Year | ~1930 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Marjorie Cobb | Daughter | — | 12 | ~1928 |
| Daniel Cobb | Son | — | 9 | ~1931 |
| Catherine Cobb | Spouse | — | 40 | ~1900 |
| William Cobb | Son | — | 5 | ~1935 |
| Lyman Cobb | Head | — | 37 | ~1903 |
| Mary Cobb | Daughter | — | 4 | ~1936 |
| John Cobb | Son | — | 10 | ~1930 |
| Catherine Cobb | Daughter | — | 2 | ~1938 |
| James Cobb | Son | — | 7 | ~1933 |
Census Appearances
1930
Plymouth, Massachusetts
Son, age 1
Plymouth, Massachusetts · implied b. ~1929 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cobb |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Irish Free State |
| Occupation | none |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Plymouth-County, Massachusetts
Son, age 10
Plymouth-County, Massachusetts · implied b. ~1930 — 9 household members
| Surname | Cobb |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Brockton city |
| 1935 Residence (County) | Plymouth |
| Highest Grade | No 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 Cobb across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Cobb
Son · 1940 · age 10 · b. ~1930 · Massachusetts
★ You are viewing this record
Sibling
William Cobb
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Daniel Cobb
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Cobb
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Cobb
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Cobb
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marjorie Cobb
Sibling · 1940 · age 12
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 — Plymouth-County, Massachusetts
Open full size
1940 US Federal Census — Plymouth-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01637-00234)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lorraine Lozaine | 13 | Daughter | — | Massachusetts |
| 2 | Robert A. Lozaine | 10 | Son | — | Massachusetts |
| 3 | Harry W. Lozaine | 9 | Son | — | Massachusetts |
| 4 | Leo L. Lozaine | 2 | Daughter | — | Massachusetts |
| 5 | Leona M. Smith | 19 | Daughter | Waitress | Massachusetts |
| 6 | Paul Rev. Merab | 80 | Head | Priest | Lebanon |
| 7 | Mary Doyle | 69 | Head | — | New York |
| 8 | John J. Doyle | 35 | Son | Turner | Massachusetts |
| 9 | Harold L. Hinglebine | 44 | Head | Mechanic | New Jersey |
| 10 | Emma A. Hinglebine | 43 | Wife | Match Marker | Massachusetts |
| 11 | Harold L. Hinglebine | 22 | Son | Laborer | Massachusetts |
| 12 | Robert J. Hinglebine | 14 | Son | — | Massachusetts |
| 13 | Evelyn J. Hinglebine | 12 | Daughter | — | Massachusetts |
| 14 | Lyman E. Cobb | 37 | Head | Laborer | Massachusetts |
| 15 | Catherine A. Cobb | 40 | Wife | — | Eire |
| 16 | Marjorie R. Cobb | 12 | Daughter | — | Massachusetts |
| 17 | John E. Cobb THIS PERSON | 10 | Son | — | Massachusetts |
| 18 | Daniel S. Cobb | 9 | Son | — | Massachusetts |
| 19 | James H. Cobb | 7 | Son | — | Massachusetts |
| 20 | William L. Cobb | 5 | Son | — | Massachusetts |
| 21 | Mary L. Cobb | 4 | Daughter | — | Massachusetts |
| 22 | Catherine A. Cobb | 2 | Daughter | — | Massachusetts |
| 23 | Olive M. Hill | 37 | Head | Housekeeper | Massachusetts |
| 24 | Leon M. Hill | 18 | Son | Soldier | Massachusetts |
| 25 | Eleanor M. Hill | 17 | Daughter | New Worker | Massachusetts |
| 26 | Marion M. Hill | 16 | Daughter | New Worker | Massachusetts |
| 27 | Dorothy Hill | 12 | Daughter | — | Massachusetts |
| 28 | Gloria R. Hill | 10 | Daughter | — | Massachusetts |
| 29 | George M. Hill | 8 | Son | — | Massachusetts |
| 30 | Lawrence L. Simpson | 49 | Head | Treer | Maine |
| 31 | Mary A. Simpson | 50 | Wife | — | Massachusetts |
| 32 | Raymond M. Simpson | 25 | Son | Mail Sticker | Massachusetts |
| 33 | Ralph J. Simpson | 19 | Son | Last Puller | Massachusetts |
| 34 | Roy A. Simpson | 17 | Son | New Worker | Massachusetts |
| 35 | Burton Simpson | 15 | Son | — | Massachusetts |
| 36 | Marilyn R. Simpson | 10 | Daughter | — | Massachusetts |
| 37 | Lois J. Simpson | 7 | Daughter | — | Massachusetts |
| 38 | Joseph Venuto | 58 | Head | Puller | Italy |
| 39 | Mary C. Venuto | 58 | Wife | — | Italy |
| 40 | Chiarina Venuto | 27 | Daughter | New Worker | Italy |
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)