CS
Cornelius Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Cornelius Sullivan across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Jeremiah & Jeremiah — first a son (b.~1908), then head of a 3-person household.
Age 32
b. ~1908
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Sullivan |
| Given Name | Cornelius |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Supervisor |
| Industry | State Service |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 900 |
| Highest Grade | C 4 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Supervisor |
| Township / Ward | Boston City |
| Est. Birth Year | ~1908 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Cornelius | Age | Birth yr |
|---|---|---|---|---|
| Margaret Sullivan | Spouse | — | 71 | ~1869 |
| Cornelius Sullivan | Son | — | 32 | ~1908 |
| Michael Sullivan | Head | — | 71 | ~1869 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age 11
Suffolk, Massachusetts · implied b. ~1909 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Cornelius A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | England |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Son, age 21
Suffolk, Massachusetts · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Cornelius J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | England |
| Occupation | Truck Driver |
| Industry | Bakery |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 32
Suffolk-County, Massachusetts · implied b. ~1908 — 3 household members
| Surname | Sullivan |
| Given Name | Cornelius |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | Supervisor |
| Industry | State Service |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 900 |
| Highest Grade | C 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 Cornelius Sullivan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Jeremiah Sullivan (~0.92 confidence) and father Jeremiah Sullivan (~0.92 confidence) and father Michael Sullivan (~0.92 confidence) and mother Margaret Sullivan (~0.92 confidence) and mother Marion Sullivan (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Jeremiah Sullivan
b. ~1873
Source father
● Household
· direct · ~0.92
Father
Jeremiah Sullivan
b. ~1874
Source father
● Household
· direct · ~0.92
Father
Michael Sullivan
b. ~1869
Source father
● Household
· direct · ~0.92
Mother
Margaret Sullivan
b. ~1869
Source mother
● Household
· direct · ~0.92
Mother
Marion Sullivan
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Cornelius Sullivan
Son · 1940 · age 32 · b. ~1908 · Massachusetts
★ You are viewing this record
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
38 people indexed on this census page (nara:1940:m-t0627-01668-00300)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Michael Sullivan | 71 | Head | — | Ireland |
| 2 | Margaret Sullivan | 71 | Wife | — | Ireland |
| 3 | Cornelius Sullivan THIS PERSON | 32 | Son | Supervisor | Massachusetts |
| 4 | James Behan | 36 | Head | Gardener | Massachusetts |
| 5 | Margaret Behan | 29 | Wife | — | Massachusetts |
| 6 | Ann M. Behan | 5 | Daughter | — | Massachusetts |
| 7 | Mary G. Johnson | 52 | Head | — | Massachusetts |
| 8 | Albert E. Smith | 26 | Son | Cook | Massachusetts |
| 9 | Donald E. Smith | 23 | Son | Cook | Massachusetts |
| 10 | Elizabeth Johnson | 19 | Daughter | New Worker | Massachusetts |
| 11 | Joseph F. Minton | 50 | Head | Operator | Massachusetts |
| 12 | Fannie M. Minton | 30 | Wife | — | Maine |
| 13 | Jennie Mclaughlin | 52 | Mother-in-law | Cook | Maine |
| 14 | Thomas F. Leahy | 28 | Head | — | Massachusetts |
| 15 | Delia C. Leahy | 64 | Wife | — | Ireland |
| 16 | Margaret T. Leahy | 26 | Daughter | Clerk | Massachusetts |
| 17 | Isabel Lawley | 58 | Head | — | Canada English |
| 18 | Margaret G. Lawley | 55 | Sister | Supervisor | Canada English |
| 19 | Mary E. Walsh | 69 | Head | — | Massachusetts |
| 20 | Joseph F. Walsh | 36 | Son | Carrier | Massachusetts |
| 21 | Lola Williams | 29 | Head | Mechanic | Massachusetts |
| 22 | Genova Williams | 27 | Wife | — | Massachusetts |
| 23 | H. Waldo | 56 | Father | Watchman | Massachusetts |
| 24 | Bernard Dolan | 26 | Brother | New Worker | Massachusetts |
| 25 | Irene Dolan | 2 | Daughter | — | Massachusetts |
| 26 | Arthur T. Riley | 41 | Head | Carrier | Massachusetts |
| 27 | Elizabeth Mcauliffe | 55 | Sister | Clerk-Tilly | Massachusetts |
| 28 | Mary A. Riley | 85 | Mother | — | Maine |
| 29 | Eleanor Breen | 16 | Granddaughter | — | Massachusetts |
| 30 | Grace A. Darling | 21 | Nurse | Practical Nurse | England |
| 31 | Mary Martin | 50 | Head | — | Massachusetts |
| 32 | Henry D. Martin | 25 | Son | Clerk-Sales | Massachusetts |
| 33 | Eleanor Martin | 24 | Daughter | Typist | Massachusetts |
| 34 | Paul Martin | 21 | Son | Carrier | Massachusetts |
| 35 | Ruth Martin | 17 | Daughter | — | Massachusetts |
| 36 | Francis D. Riley | 40 | Head | Mechanic | Massachusetts |
| 37 | Martha Riley | 40 | Wife | — | Massachusetts |
| 38 | Levitt Hansen | 17 | Son | — | Massachusetts |
Related Census Records
Pedigree Summary
Cornelius
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)