RS
Robert Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Robert Sullivan across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents John & Thomas — first a son (b.~1913), then head of a 4-person household.
Age 27
b. ~1913
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Sullivan |
| Given Name | Robert |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Attorney |
| Industry | Law Office |
| Class of Worker | PW |
| Hours Worked | 40 |
| Highest Grade | C-4 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Attorney |
| Township / Ward | Chicago |
| Est. Birth Year | ~1913 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Thomas Sullivan | Head | — | 62 | ~1878 |
| Robert Sullivan | Son | — | 27 | ~1913 |
| Thomas Sullivan | Son | — | 23 | ~1917 |
| Mayme Sullivan | Spouse | — | 60 | ~1880 |
Census Appearances
1920
Cook, Illinois
Son, age 8
Cook, Illinois · implied b. ~1912 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 18
Cook, Illinois · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 27
Cook-County, Illinois · implied b. ~1913 — 4 household members
| Surname | Sullivan |
| Given Name | Robert |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Attorney |
| Industry | Law Office |
| Class of Worker | PW |
| Hours Worked | 40 |
| Highest Grade | C-4 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Robert Sullivan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Sullivan (~0.92 confidence) and father Thomas Sullivan (~0.92 confidence) and mother Mayme Sullivan (~0.92 confidence) and father Clarence Sullivan (~0.92 confidence) and mother Mary Sullivan (~0.92 confidence) and mother Catherine Sullivan (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Sullivan
b. ~1873
Source father
● Household
· direct · ~0.92
Father
Thomas Sullivan
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Mayme Sullivan
b. ~1880
Source mother
● Household
· direct · ~0.92
Father
Clarence Sullivan
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Mary Sullivan
b. ~1883
Source mother
● Household
· direct · ~0.92
Mother
Catherine Sullivan
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Sullivan
Son · 1940 · age 27 · b. ~1913 · Illinois
★ You are viewing this record
Sibling
Thomas Sullivan
Sibling · 1940 · age 23
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01015-00954)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Vito P. Gadula | 20 | son | Delivery Boy | New York |
| 42 | Della Mcdonough | 70 | Head | — | Ireland |
| 43 | Florence Mcdonough | 35 | Daughter | Stenographer | Illinois |
| 44 | Leonard Lipida | 35 | Head | Shearman | Arkansas |
| 45 | Mary Lipida | 35 | Wife | — | Arkansas |
| 46 | Ann Kane | 81 | Head | — | Illinois |
| 47 | Sam Laberson | 65 | Head | Owner | Russia |
| 48 | Tillie Laberson | 60 | Wife | — | Russia |
| 49 | Fred Laberson | 32 | son | Manager Shipping | Russia |
| 50 | Louis Laberson | 30 | son | Sales Clerk | Russia |
| 51 | Victoria Laberson | 18 | Daughter | — | Illinois |
| 52 | Katherine Tell | 46 | Head | Operator | Illinois |
| 53 | William Tell | 17 | son | — | Wisconsin |
| 54 | James Tell | 13 | son | — | Illinois |
| 55 | May Sherry | 57 | sister | Manager | England |
| 56 | Marion Sherry | 35 | niece | — | Illinois |
| 57 | Laurette O'Donnell | 39 | sister | Stenograph | Illinois |
| 58 | Phillip Maas | 53 | Head | Salesman | Michigan |
| 59 | Frances Maas | 45 | Wife | — | Iowa |
| 60 | Elizabeth Tynan | 69 | mother-in-law | — | Iowa |
| 61 | Madeline Tynan | 39 | sister-in-law | Clerk | Illinois |
| 62 | Frederick Swanson | 52 | Head | Teacher | Illinois |
| 63 | Gertrude Swanson | 48 | Wife | — | Illinois |
| 64 | Frederick Jr Swanson | 18 | son | — | Illinois |
| 65 | Dorothy Swanson | 11 | Daughter | — | Illinois |
| 66 | Thomas J. Sullivan | 62 | Head | Treasurer | Illinois |
| 67 | Mayme Sullivan | 60 | Wife | — | Wisconsin |
| 68 | Robert Sullivan THIS PERSON | 27 | son | Attorney | Illinois |
| 69 | Thomas Sullivan | 23 | son | Bookkeeper | Illinois |
| 70 | Frederick Spoerer | 72 | Head | Broker | Illinois |
| 71 | Agnes Spoerer | 69 | Wife | — | Illinois |
| 72 | Herbert Davies | 58 | Head | Owner | England |
| 73 | Ella Davies | 52 | Wife | — | Illinois |
| 74 | Dorothy Davies | 19 | daughter | — | Illinois |
| 75 | Robert Savage | 67 | Head | Carpenter | New Jersey |
| 76 | Jeannette Savage | 60 | Wife | — | Illinois |
| 77 | Gustav Masemann | 54 | Head | Bridge Tender | Illinois |
| 78 | Minnie Masemann | 53 | Wife | — | Illinois |
| 79 | Wilbert Masemann | 25 | son | Clerk | Illinois |
| 80 | Frank Mittelstaedt | 78 | Head | — | Germany |
Pedigree Summary
Robert + 1 sibling
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 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)