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William Sullivan — 1930 US Census Record
Model Tree available1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this William Sullivan across the 1910, 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed), with identified parents William & Timothy — first a son (b.~1905), then head of a 8-person household.
Age 25
b. ~1905
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Sullivan |
| Given Name | William J Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | Accountant |
| Industry | Broker Office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Accountant |
| Township / Ward | Cambridge City |
| Est. Birth Year | ~1905 |
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 1930 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Mary Sullivan | Daughter | — | 17 | ~1913 |
| Eleanor Sullivan | Daughter | — | 14 | ~1916 |
| Alice Sullivan | Daughter | — | 15 | ~1915 |
| Eileen Sullivan | Daughter | — | 12 | ~1918 |
| William Sullivan | Head | — | 55 | ~1875 |
| Margaret Sullivan | Other | — | 32 | ~1898 |
| William Sullivan | Son | — | 25 | ~1905 |
| Mary Sullivan | Spouse | — | 48 | ~1882 |
Census Appearances
1910
Middlesex, Massachusetts
Son, age 6
Middlesex, Massachusetts · implied b. ~1904 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Middlesex, Massachusetts
Son, age 15
Middlesex, Massachusetts · implied b. ~1905 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 25
Middlesex, Massachusetts · implied b. ~1905 — 8 household members
| Surname | Sullivan |
| Given Name | William J Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Accountant |
| Industry | Broker Office |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 (1910, 1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage. Identified parents: father William Sullivan (~0.92 confidence) and father Timothy Sullivan (~0.92 confidence) and father Timothy Sullivan (~0.92 confidence) and mother Mary Sullivan (~0.92 confidence) and mother Mary Sullivan (~0.92 confidence) and mother Mary Sullivan (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Sullivan
b. ~1875
Source father
● Household
· direct · ~0.92
Father
Timothy Sullivan
b. ~1873
Source father
● Household
· direct · ~0.92
Father
Timothy Sullivan
b. ~1871
Source father
● Household
· direct · ~0.92
Mother
Mary Sullivan
b. ~1871
Source mother
● Household
· direct · ~0.92
Mother
Mary Sullivan
b. ~1877
Source mother
● Household
· direct · ~0.92
Mother
Mary Sullivan
b. ~1882
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Sullivan
Son · 1930 · age 25 · b. ~1905 · Massachusetts
★ You are viewing this record
Sibling
Mary Sullivan
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eileen Sullivan
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eleanor Sullivan
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Sullivan
Sibling · 1930 · 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
1930 US Federal Census — Middlesex, Massachusetts
Open full size
1930 US Federal Census — Middlesex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:massachusettscensus00reel916:1140)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William J Sullivan | 55 | Head | Director | Massachusetts |
| 2 | Mary E Sullivan | 48 | Wife | — | Massachusetts |
| 3 | William J Jr Sullivan THIS PERSON | 25 | Son | Accountant | Massachusetts |
| 4 | Mary E Sullivan | 17 | Daughter | — | Massachusetts |
| 5 | Alice M Sullivan | 15 | Daughter | — | Massachusetts |
| 6 | Eleanor M Sullivan | 14 | Daughter | — | Massachusetts |
| 7 | Eileen Sullivan | 12 | Daughter | — | Massachusetts |
| 8 | Margaret Sullivan | 32 | Servant | Maid | Irish Free State |
| 9 | George Sargent | 52 | Head | Manager | Massachusetts |
| 10 | Edith Sargent | 55 | Wife | — | Massachusetts |
| 11 | George Sargent | 15 | Son | — | Massachusetts |
| 12 | Edith Sargent | 29 | Daughter | — | Massachusetts |
| 13 | George Sargent | 14 | Son | — | Massachusetts |
| 14 | Edith Sargent | 12 | Daughter | — | Massachusetts |
| 15 | William Park | 42 | Head | Manager | Massachusetts |
| 16 | Mary Park | 40 | Wife | — | Massachusetts |
| 17 | William Park | 12 | Son | — | Massachusetts |
| 18 | Mary Park | 9 | Daughter | — | Massachusetts |
| 19 | John Lundberg | 43 | Head | — | Rhode Island |
| 20 | Hilda Lundberg | 45 | Sister | — | Rhode Island |
| 21 | Anna Lundberg | 42 | Sister | — | Rhode Island |
| 22 | John Lundberg | 45 | Head | Gardener | Irish Free State |
| 23 | Mary Lundberg | 43 | Wife | — | Irish Free State |
| 24 | John Lundberg | 19 | Son | Clerk | Massachusetts |
| 25 | Mary Lundberg | 17 | Daughter | — | Massachusetts |
| 26 | John Harrington | 56 | Head | Foreman | Massachusetts |
| 27 | Mary Harrington | 54 | Wife | — | Massachusetts |
| 28 | Harold Read | 48 | Head | Painter | Massachusetts |
| 29 | Mary Read | 42 | Wife | — | Massachusetts |
| 30 | Harold Read | 22 | Son | — | Massachusetts |
| 31 | Mary Read | 20 | Daughter | — | Massachusetts |
| 32 | Harold Read | 19 | Son | — | Massachusetts |
| 33 | Mary Read | 16 | Daughter | — | Massachusetts |
| 34 | Harold Read | 13 | Son | — | Massachusetts |
| 35 | Mary Read | 22 | Daughter | — | Massachusetts |
| 36 | Harold Read | 10 | Son | — | Massachusetts |
| 37 | Mary Read | 16 | Daughter | — | Massachusetts |
| 38 | Harold Read | 23 | Son | Maid | Irish Free State |
| 39 | Mary Read | 16 | Daughter | — | Irish Free State |
| 40 | John Harrington | 59 | Head | Superintendent | Massachusetts |
| 41 | Mary Harrington | 57 | Wife | — | Massachusetts |
| 42 | John Harrington | 26 | Son | Salesman | Massachusetts |
| 43 | Mary Harrington | 25 | Daughter | — | Massachusetts |
| 44 | John Harrington | 45 | Son | — | Massachusetts |
| 45 | Mary Harrington | 35 | Daughter | — | Massachusetts |
| 46 | John Harrington | 23 | Son | Maid | Irish Free State |
| 47 | Mary Harrington | 16 | Daughter | — | Irish Free State |
| 48 | John Harrington | 23 | Son | Maid | Irish Free State |
| 49 | Mary Harrington | 16 | Daughter | — | Irish Free State |
| 50 | John Harrington | 23 | Son | Maid | Irish Free State |
Pedigree Summary
William + 4 siblings
Gen 1 · 6 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)