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John Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Sullivan across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1917), then head of a 8-person household.
Age 23
b. ~1917
Male
Son
Born: MASSACHUSETTS
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | SULLIVAN |
| Given Name | JOHN JR |
| Relationship to Head | SON |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | MASSACHUSETTS |
| 1935 Residence (City) | Belmont |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | C-3 |
| 1935 Residence | SAME HOUSE |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Belmont |
| Est. Birth Year | ~1917 |
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 |
|---|---|---|---|---|
| Helen Sullivan | Daughter | — | 30 | ~1910 |
| Rita Sullivan | Daughter | — | 21 | ~1919 |
| Sylvia Sullivan | Daughter | — | 27 | ~1913 |
| Edna Sullivan | Daughter | — | 9 | ~1931 |
| John Sullivan | Head | — | 57 | ~1883 |
| Francis Sullivan | Son | — | 18 | ~1922 |
| John Sullivan | Son | — | 23 | ~1917 |
| Joseph Sullivan | Son | — | 15 | ~1925 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age 1
Suffolk, Massachusetts · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | John Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| 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 12
Suffolk, Massachusetts · implied b. ~1918 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 23
Middlesex-County, Massachusetts · implied b. ~1917 — 8 household members
| Surname | SULLIVAN |
| Given Name | JOHN JR |
| Relationship to Head | SON |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | MASSACHUSETTS |
| 1935 Residence (City) | Belmont |
| 1935 Residence (County) | Middlesex |
| Income (1939) | 0 |
| Highest Grade | C-3 |
| 1935 Residence | SAME HOUSE |
| 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 Sullivan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Sullivan (~0.92 confidence) and father John Sullivan (~0.92 confidence) and father John Sullivan (~0.92 confidence) and mother Mildred Sullivan (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Sullivan
b. ~1883
Source father
● Household
· direct · ~0.92
Father
John Sullivan
b. ~1893
Source father
● Household
· direct · ~0.92
Father
John Sullivan
b. ~1892
Source father
● Household
· direct · ~0.92
Mother
Mildred Sullivan
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Sullivan
Son · 1940 · age 23 · b. ~1917 · Massachusetts
★ You are viewing this record
Sibling
Sylvia Sullivan
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Sullivan
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Sullivan
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Sullivan
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edna Sullivan
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Sullivan
Sibling · 1940 · age 15
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01602-00828)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Carol Brine | 3 | DAUGHTER | — | MASSACHUSETTS |
| 2 | Lucy Di Pietro | 18 | MAID | Maid | MASSACHUSETTS |
| 3 | Harold Benner | 54 | HEAD | Instrument Maker | MAINE |
| 4 | Helen Benner | 52 | WIFE | — | MAINE |
| 5 | John Sullivan | 57 | HEAD | Civil Engineer | MASSACHUSETTS |
| 6 | Helen Sullivan | 30 | DAUGHTER | Key Punch Operator | MASSACHUSETTS |
| 7 | Sylvia Sullivan | 27 | DAUGHTER | Operator | MASSACHUSETTS |
| 8 | John Jr Sullivan THIS PERSON | 23 | SON | — | MASSACHUSETTS |
| 9 | Rita Sullivan | 21 | DAUGHTER | Office Clerk | MASSACHUSETTS |
| 10 | Francis Sullivan | 18 | SON | — | MASSACHUSETTS |
| 11 | Joseph Sullivan | 15 | SON | — | MASSACHUSETTS |
| 12 | Edna Sullivan | 9 | DAUGHTER | — | MASSACHUSETTS |
| 13 | Paul Denish | 49 | HEAD | Booking Agent | RHODE ISLAND |
| 14 | Anita Denish | 50 | WIFE | — | ITALY |
| 15 | Anita Denish | 14 | DAUGHTER | — | MASSACHUSETTS |
| 16 | George M Morgan | 48 | HEAD | District Manager | MASSACHUSETTS |
| 17 | Teresa B Morgan | 52 | WIFE | — | MASSACHUSETTS |
| 18 | Phyllis R Morgan | 22 | DAUGHTER | Clerk | MASSACHUSETTS |
| 19 | Hugh Grant | 44 | HEAD | Manager | PENNSYLVANIA |
| 20 | Ella M Grant | 41 | WIFE | — | PENNSYLVANIA |
| 21 | Beverly Grant | 14 | DAUGHTER | — | PENNSYLVANIA |
| 22 | Isabella Grant | 12 | DAUGHTER | — | PENNSYLVANIA |
| 23 | Janet Grant | 8 | DAUGHTER | — | PENNSYLVANIA |
| 24 | John Cogswell | 54 | HEAD | Feature Writer | WISCONSIN |
| 25 | Inez Cogswell | 60 | WIFE | — | OHIO |
| 26 | Cyril Bradford | 42 | HEAD | Traveling Salesman | CONNECTICUT |
| 27 | Helen Bradford | 40 | WIFE | — | CONNECTICUT |
| 28 | George Bradford | 10 | SON | — | MASSACHUSETTS |
| 29 | Nathaniel Warshaw | 45 | HEAD | Factory Manager | MASSACHUSETTS |
| 30 | Martha Warshaw | 43 | WIFE | — | MASSACHUSETTS |
| 31 | Stanley Warshaw | 17 | SON | — | MASSACHUSETTS |
| 32 | Robert Warshaw | 10 | SON | — | MASSACHUSETTS |
| 33 | Roy W Carlson | 39 | HEAD | Professor | MINNESOTA |
| 34 | Eleanor Carlson | 34 | WIFE | — | MICHIGAN |
| 35 | Susan Carlson | 8 | DAUGHTER | — | CALIFORNIA |
| 36 | Sarah Carlson | 1 | DAUGHTER | — | CALIFORNIA |
| 37 | Frank Hughes | 42 | HEAD | Postal Clerk | MASSACHUSETTS |
| 38 | Helena Hughes | 37 | WIFE | — | MASSACHUSETTS |
| 39 | Carol Hughes | 2 | DAUGHTER | — | MASSACHUSETTS |
| 40 | John H Galway | 54 | HEAD | Asst Superintendent Of Mails | MASSACHUSETTS |
Pedigree Summary
John + 6 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)