JS
James Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this James Sullivan across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Charles & Mary — first a son (b.~1918), then head of a 4-person household.
Age 22
b. ~1918
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Sullivan |
| Given Name | James P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | M |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1918 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Charles Sullivan | Head | — | 62 | ~1878 |
| Charles Sullivan | Son | — | 30 | ~1910 |
| James Sullivan | Son | — | 22 | ~1918 |
| Mary Sullivan | Spouse | — | 60 | ~1880 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age 1
Suffolk, Massachusetts · implied b. ~1919 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | James P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Son, age 11
Suffolk, Massachusetts · implied b. ~1919 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | James P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| 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
Suffolk-County, Massachusetts
Son, age 22
Suffolk-County, Massachusetts · implied b. ~1918 — 4 household members
| Surname | Sullivan |
| Given Name | James P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | M |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Highest Grade | H-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 James Sullivan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Charles Sullivan (~0.92 confidence) and mother Mary Sullivan (~0.92 confidence) and mother Mary Sullivan (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Charles Sullivan
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Mary Sullivan
b. ~1879
Source mother
● Household
· direct · ~0.92
Mother
Mary Sullivan
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Sullivan
Son · 1940 · age 22 · b. ~1918 · Massachusetts
★ You are viewing this record
Sibling
Charles Sullivan
Sibling · 1940 · age 30
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-t0627-01669-00534)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | David E. Scannell | 65 | Head | Surgeon | Massachusetts |
| 2 | Elizabeth A. Scannell | 65 | Wife | — | Canada Eng. |
| 3 | David Scannell | 27 | Son | — | Massachusetts |
| 4 | Gordon Scannell | 25 | Son | — | Massachusetts |
| 5 | Isabelle Lynn | 57 | Maid | Maid | Massachusetts |
| 6 | Margaret Venables | 67 | Maid | — | Canada Eng. |
| 7 | Hilda B. Crosby | 86 | Head | — | Michigan |
| 8 | Margaret Cooke | 28 | Maid | Maid | Irish Free State |
| 9 | Charles J. Sullivan | 62 | Head | Salesman | Massachusetts |
| 10 | Mary H. Sullivan | 60 | Wife | — | Massachusetts |
| 11 | Charles J. Jr. Sullivan | 30 | Son | Doctor | Massachusetts |
| 12 | James P. Sullivan THIS PERSON | 22 | Son | — | Massachusetts |
| 13 | Gertrude Carey | 39 | Head | School Teacher | Massachusetts |
| 14 | Paul A. Murray | 12 | Nephew | — | Massachusetts |
| 15 | Anne Nagle | 13 | Niece | — | Washington D.C. |
| 16 | Edward Nagle | 9 | Nephew | — | Washington D.C. |
| 17 | Frederick Nagle | 5 | Nephew | — | Massachusetts |
| 18 | Agnes Clunkett | 60 | Housekeeper | Housekeeper | Massachusetts |
| 19 | Alice B. Mclaughlin | 31 | Head | Salesgirl | Massachusetts |
| 20 | William T. Mclaughlin | 21 | Brother | — | Massachusetts |
| 21 | Margaret Murray | 61 | Head | Auditor | Massachusetts |
| 22 | John T. Murray | 53 | Brother | — | Massachusetts |
| 23 | Agnes M. Murray | 53 | Sister | Advertising | Massachusetts |
| 24 | Eleanor G. Walsh | 39 | Sister | — | Massachusetts |
| 25 | Michael Walsh | 35 | Lodger | — | Canada Eng. |
| 26 | Eileen Kelly | 32 | Maid | Maid | Irish Free State |
| 27 | Anna Louise Ulrich | 62 | Head | — | Massachusetts |
| 28 | Mary Ulrich | 31 | Daughter | Stenographer | Massachusetts |
| 29 | Joseph H. Ulrich | 29 | Son | Offset Lithographer | Massachusetts |
| 30 | M. Catherine Ulrich | 27 | Daughter | Bookkeeper | Massachusetts |
| 31 | Louise C. Ulrich | 25 | Daughter | — | Massachusetts |
| 32 | John J. Ulrich | 23 | Son | — | Massachusetts |
| 33 | James Ulrich | 21 | Son | Stock Boy | Massachusetts |
| 34 | Elizabeth Cunningham | 80 | Lodger | — | Massachusetts |
| 35 | Margaret C. Cunningham | 72 | Lodger | — | Massachusetts |
| 36 | Patrick J. Sullivan | 58 | Head | Tavern | Irish Free State |
| 37 | Katherine Sullivan | 54 | Wife | — | Irish Free State |
| 38 | Julia Sullivan | 25 | Daughter | — | Massachusetts |
| 39 | Thomas B. Sullivan | 24 | Son | Bartender | Massachusetts |
| 40 | Michael Sullivan | 22 | Son | Bartender | Massachusetts |
Related Census Records
Pedigree Summary
James + 1 sibling
Gen 1 · 3 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)