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Joseph Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Joseph Sullivan across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Michael & Elizabeth — first a son (b.~1905), then head of a 4-person household.
Age 35
b. ~1905
Male
Son
Born: Montana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Sullivan |
| Given Name | Joseph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Attendant |
| Industry | Garage |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 620 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Occupation | Attendant |
| Township / Ward | Chicago 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Joseph | Age | Birth yr |
|---|---|---|---|---|
| Elizabeth Sullivan | Head | — | 47 | ~1893 |
| Mollie Gallagher | Other | — | 63 | ~1877 |
| Joseph Sullivan | Son | — | 35 | ~1905 |
| Vincent Sullivan | Son | — | 33 | ~1907 |
Census Appearances
1920
Cook, Illinois
Son, age 15
Cook, Illinois · implied b. ~1905 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Joseph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Nebraska |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1930
Cook, Illinois
Son, age 24
Cook, Illinois · implied b. ~1906 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Joseph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Montana |
| Age at First Marriage | No |
| Father's Birthplace | Nebraska |
| Mother's Birthplace | Illinois |
| Occupation | Manager |
| Industry | Gas Station |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1940
Cook-County, Illinois
Son, age 35
Cook-County, Illinois · implied b. ~1905 — 4 household members
| Surname | Sullivan |
| Given Name | Joseph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Occupation | Attendant |
| Industry | Garage |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 620 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
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 Joseph Sullivan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Michael Sullivan (~0.92 confidence) and mother Elizabeth Sullivan (~0.92 confidence) and mother Elizabeth Sullivan (~0.92 confidence) and mother Elizabeth Sullivan (~0.60 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.84
Father
Michael Sullivan
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Elizabeth Sullivan
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Elizabeth Sullivan
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Elizabeth Sullivan
b. ~1893
Source mother
● Household
· direct · ~0.6
This person
Anchor record
Joseph Sullivan
Son · 1940 · age 35 · b. ~1905 · Illinois
★ You are viewing this record
Sibling
Vincent Sullivan
Sibling · 1940 · age 33
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-t0627-00982-00158)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Thomas Hengh | 48 | Head | Policeman | Eire |
| 2 | Anna Hengh | 38 | Wife | — | Eire |
| 3 | Ann Hengh | 15 | Daughter | — | Illinois |
| 4 | Dennis Hengh | 19 | Nephew | — | Illinois |
| 5 | Michael Gallagher | 41 | Head | Salesman | Eire |
| 6 | Marie Gallagher | 40 | Wife | Assembler | Eire |
| 7 | Elizabeth Sullivan | 47 | Head | — | Illinois |
| 8 | Joseph Sullivan THIS PERSON | 35 | Son | Attendant | Montana |
| 9 | Vincent Sullivan | 33 | Son | Truck Driver | Colorado |
| 10 | Mollie Gallagher | 63 | Sister | — | Eire |
| 11 | Jessie Cummins | 55 | Head | — | Eire |
| 12 | Lillian Williams | 52 | Niece | Attendant | Eire |
| 13 | Francis Cummins | 40 | Head | Electrician | Illinois |
| 14 | Mary A Cummins | 34 | Wife | — | Illinois |
| 15 | Mark F Cummins | 9 | Daughter | — | Illinois |
| 16 | Daniel R Cummins | 5 | Son | — | Illinois |
| 17 | Belle M Potter | 79 | Head | — | Illinois |
| 18 | Bartlette Potter | 55 | Son | Salesman | Illinois |
| 19 | Willis Potter | 50 | Son | — | Illinois |
| 20 | Alfred Potter | 47 | Son | Mechanic | Illinois |
| 21 | Pearl Belle Potter | 31 | Daughter | — | Illinois |
| 22 | Nancy Lee Potter | 3 | Daughter | — | Illinois |
| 23 | Neil Kent | 32 | Head | Policeman | Illinois |
| 24 | Clara Kent | 36 | Wife | — | Illinois |
| 25 | Neil Jr Kent | 5 | Son | — | Illinois |
| 26 | Fred H Touch | 49 | Head | Policeman | Illinois |
| 27 | Jeannette Touch | 38 | Wife | — | Illinois |
| 28 | Annabella Touch | 3 | Daughter | — | Illinois |
| 29 | Chauncey Lopez | 35 | Head | Teller | Illinois |
| 30 | Thelma Lopez | 32 | Wife | — | Indiana |
| 31 | Donald Lopez | 2 | Son | — | Illinois |
| 32 | Francis Flynn | 66 | Head | — | Iowa |
| 33 | Madeline Flynn | 41 | Daughter | Teacher | Iowa |
| 34 | Morris C Hurnett | 73 | Head | — | Eire |
| 35 | Mary Hurnett | 64 | Wife | — | Eire |
| 36 | Daniel Hurnett | 40 | Son | Carpenter | Illinois |
| 37 | Edward Hurnett | 38 | Son | Electrical | Illinois |
| 38 | Francis Hurnett | 35 | Son | Clerk | Illinois |
| 39 | Anna Hurnett | 62 | Sister | — | Eire |
| 40 | Charles Luce | 65 | Head | Salesman | Czecho-Slovakia |
Pedigree Summary
Joseph + 1 sibling
Gen 1 · 4 parents
~0.84
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)