HS
Helen Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Helen Sullivan across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Dennis & Cassandra — first a daughter (b.~1911), then head of a 5-person household.
Age 29
b. ~1911
Female
Daughter
Born: Mass
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Sullivan |
| Given Name | Helen R. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Mass |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | School Teacher |
| Industry | School |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1616 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | mass |
| Occupation | Teacher |
| Township / Ward | Boston City |
| Est. Birth Year | ~1911 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Helen | Age | Birth yr |
|---|---|---|---|---|
| Helen Sullivan | Daughter | — | 29 | ~1911 |
| Magdalen Sullivan | Daughter | — | 30 | ~1910 |
| Margaret Sullivan | Head | — | 56 | ~1884 |
| Charles Sullivan | Son | — | 28 | ~1912 |
| John Sullivan | Son | — | 25 | ~1915 |
Census Appearances
1920
Suffolk, Massachusetts
Daughter, age 7
Suffolk, Massachusetts · implied b. ~1913 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Mass |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | mass |
1930
Suffolk, Massachusetts
Daughter, age 18
Suffolk, Massachusetts · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Mass |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Mass |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | mass |
1940
Suffolk-County, Massachusetts
Daughter, age 29
Suffolk-County, Massachusetts · implied b. ~1911 — 5 household members
| Surname | Sullivan |
| Given Name | Helen R. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Mass |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | School Teacher |
| Industry | School |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1616 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | mass |
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 Helen Sullivan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Dennis Sullivan (~0.92 confidence) and mother Cassandra Sullivan (~0.92 confidence) and mother Hannah Sullivan (~0.92 confidence) and father Thomas Sullivan (~0.92 confidence) and mother Margaret Sullivan (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Dennis Sullivan
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Cassandra Sullivan
b. ~1879
Source mother
● Household
· direct · ~0.92
Mother
Hannah Sullivan
b. ~1879
Source mother
● Household
· direct · ~0.92
Father
Thomas Sullivan
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Margaret Sullivan
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Helen Sullivan
Daughter · 1940 · age 29 · b. ~1911 · Massachusetts
★ You are viewing this record
Sibling
Charles Sullivan
Sibling · 1940 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Magdalen Sullivan
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Sullivan
Sibling · 1940 · age 25
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-t0627-01674-00516)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Margaret Sullivan | 56 | Head | — | Mass |
| 2 | Magdalen Sullivan | 30 | Daughter | Stenographer | Mass |
| 3 | Helen R. Sullivan THIS PERSON | 29 | Daughter | School Teacher | Mass |
| 4 | Charles H. Sullivan | 28 | Son | Sorter | Mass |
| 5 | John R. Sullivan | 25 | Son | Clerk | Mass |
| 6 | Lewis R. O'Neil | 53 | Head | Clerk | Nova Scotia |
| 7 | Mary T. O'Neil | 50 | Wife | — | Nova Scotia |
| 8 | William O'Neil | 23 | Son | Chauffeur | Mass |
| 9 | Richard O'Neil | 19 | Son | — | Mass |
| 10 | Bernadine A. Cullen | 49 | Sister-in-law | Clerk Payroll | Nova Scotia |
| 11 | Christopher Woods | 87 | Boarder | — | Ireland |
| 12 | John J. Boles | 39 | Head | Counter Clerk | Mass |
| 13 | Helen E. Boles | 34 | Wife | — | Mass |
| 14 | Richard Boles | 13 | Son | — | Mass |
| 15 | John J. Boles | 12 | Son | — | Mass |
| 16 | Hugh Boles | 10 | Son | — | Mass |
| 17 | Dorothy Boles | 6 | Daughter | — | Mass |
| 18 | James Boles | 5 | Son | — | Mass |
| 19 | Duncan C. Chisholm | 53 | Head | Clerk | Canada Eng. |
| 20 | Mary E. Chisholm | 43 | Wife | — | Canada English |
| 21 | Mary G. Chisholm | 24 | Daughter | Stenographer | Canada Eng. |
| 22 | Margaret C. Chisholm | 23 | Daughter | — | Canada Eng. |
| 23 | Catherine G. Chisholm | 16 | Daughter | — | Canada Eng. |
| 24 | Thomas E. Chisholm | 11 | Son | — | Mass |
| 25 | Christine Ann Chisholm | 7 | Daughter | — | Mass |
| 26 | George B. Mahun | 57 | Head | Telephone Testman | Mass |
| 27 | Margaret Mahun | 58 | Wife | — | Eire |
| 28 | Margaret M. Mahun | 27 | Daughter | Registered Nurse | Mass |
| 29 | Ralph E. Nolan | 17 | Nephew | Salesman | Mass |
| 30 | Anthony J. Valkenva | 52 | Head | Draftsman | Italy |
| 31 | Margaret M. O'Connell | 51 | Head | School Teacher | Mass |
| 32 | Margaret O'Connell | 79 | Mother | — | Ireland |
| 33 | Charles J. O'Connell | 49 | Brother | Meter Reader | Mass |
| 34 | Frederick D. O'Connell | 44 | Brother | — | Mass |
| 35 | Arthur L. Shaughnessy | 44 | Head | Supervisor | Mass |
| 36 | Alice T. Shaughnessy | 36 | Wife | — | Mass |
| 37 | Dorothy Madera | 75 | Head | — | Italy |
| 38 | Nettie Madera | 44 | Daughter | Sewer | Italy |
| 39 | Ralph Jr. Best | 36 | Head | Supervisor | Mass |
| 40 | Helen L. Best | 34 | Wife | — | Mass |
Pedigree Summary
Helen + 3 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)