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William Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this William Sullivan across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Louis & Thomas — 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 | Suffolk-County, Massachusetts |
| Surname | Sullivan |
| Given Name | William F |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | battery man |
| Industry | Edison Light |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1250 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Battery Man |
| Township / Ward | Boston City |
| 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 William | Age | Birth yr |
|---|---|---|---|---|
| Nellie Sullivan | Head | — | 50 | ~1890 |
| Paul Sullivan | Son | — | 17 | ~1923 |
| Walter Sullivan | Son | — | 9 | ~1931 |
| Edward Sullivan | Son | — | 19 | ~1921 |
| James Sullivan | Son | — | 13 | ~1927 |
| Richard Sullivan | Son | — | 20 | ~1920 |
| John Sullivan | Son | — | 24 | ~1916 |
| William Sullivan | Son | — | 23 | ~1917 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age 1
Suffolk, Massachusetts · implied b. ~1919 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | William F |
| 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 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | William F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 23
Suffolk-County, Massachusetts · implied b. ~1917 — 8 household members
| Surname | Sullivan |
| Given Name | William F |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Occupation | battery man |
| Industry | Edison Light |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1250 |
| Highest Grade | No 8 |
| 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 William Sullivan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Louis Sullivan (~0.92 confidence) and father Thomas Sullivan (~0.92 confidence) and mother Nellie Sullivan (~0.92 confidence) and mother Christine Sullivan (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Louis Sullivan
b. ~1892
Source father
● Household
· direct · ~0.92
Father
Thomas Sullivan
b. ~1898
Source father
● Household
· direct · ~0.92
Mother
Nellie Sullivan
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Christine Sullivan
b. ~1895
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Sullivan
Son · 1940 · age 23 · b. ~1917 · Massachusetts
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Sibling
Richard Sullivan
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Sullivan
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Sullivan
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Sullivan
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Sullivan
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Sullivan
Sibling · 1940 · age 13
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-t0627-01670-00080)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Rose Segel | 29 | Cousin | Social Worker | Minnesota |
| 2 | John E O'Keefe | 24 | Head | Salesman | Massachusetts |
| 3 | Margaret V O'Keefe | 23 | Wife | Chipper | Massachusetts |
| 4 | Margaret O'Keefe | 3 | Daughter | — | Massachusetts |
| 5 | Joseph Connors | 26 | Lodger | Salesman | Massachusetts |
| 6 | Catherine A Fey | 65 | Head | — | Massachusetts |
| 7 | Joseph E Fey | 37 | Son | Chauffeur | Massachusetts |
| 8 | Catherine A Fey | 21 | Daughter | Clipper | Massachusetts |
| 9 | Nellie E Sullivan | 50 | Head | — | Newfoundland |
| 10 | John J Sullivan | 24 | Son | Operator | Massachusetts |
| 11 | William F Sullivan THIS PERSON | 23 | Son | Battery Man | Massachusetts |
| 12 | Richard L Sullivan | 20 | Son | — | Massachusetts |
| 13 | Edward J Sullivan | 19 | Son | Driver | Massachusetts |
| 14 | Paul R Sullivan | 17 | Son | Driver'S Assistant | Massachusetts |
| 15 | James R Sullivan | 13 | Son | — | Massachusetts |
| 16 | Walter A Sullivan | 9 | Son | — | Massachusetts |
| 17 | Richard Warren | 62 | Head | Inspector | Massachusetts |
| 18 | Alice M Warren | 65 | Wife | — | Massachusetts |
| 19 | James Edward F Warren | 27 | Son | Assignment Of Policies Clerk | Massachusetts |
| 20 | Mary E Warren | 21 | Daughter | — | Massachusetts |
| 21 | Flora Winer | 66 | Head | — | Russia |
| 22 | Helen Winer | 21 | Daughter | New Worker | Massachusetts |
| 23 | William Winer | 43 | Son | Salesman | Massachusetts |
| 24 | Harry L Morrison | 35 | Head | Manager | New Hampshire |
| 25 | Marjory L Morrison | 31 | Wife | — | Vermont |
| 26 | June L Morrison | 9 | Daughter | — | Massachusetts |
| 27 | Harry L Jr Morrison | 7 | Son | — | Massachusetts |
| 28 | Beverly A Morrison | 2 | Daughter | — | Massachusetts |
| 29 | Annie Rennie | 48 | Head | — | Scotland |
| 30 | Anne S Rennie | 20 | Daughter | Typist Clerk | Massachusetts |
| 31 | Helen R Rennie | 19 | Daughter | Book Binder | Massachusetts |
| 32 | Anna E James | 36 | Head | Waitress | Massachusetts |
| 33 | Joseph T Jr James | 15 | Son | — | Massachusetts |
| 34 | Ellen Austin | 64 | Mother | — | Newfoundland |
| 35 | John Soltz | 70 | Head | — | Russia |
| 36 | Rebecca Soltz | 65 | Wife | — | Russia |
| 37 | Estelle L Tingley | 59 | Head | — | Massachusetts |
| 38 | Evelyn L Tingley | 39 | Daughter | Feeder | Massachusetts |
| 39 | George F Cherbane | 32 | Lodger | Chauffeur | Vermont |
| 40 | Thomas J Kennely | 50 | Head | Machinist | England |
Related Census Records
Pedigree Summary
William + 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)