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Cornelius Sullivan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Will-County, Illinois
Our Model Tree links this Cornelius Sullivan across the 1920, 1930 and 1940 US Censuses in Will-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1862), then head of a 4-person household.
Age 78
b. ~1862
Male
Head
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Will-County, Illinois |
| Surname | Sullivan |
| Given Name | Cornelius |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 78 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Joliet |
| 1935 Residence (County) | Will |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Joliet |
| Est. Birth Year | ~1862 |
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 Cornelius | Age | Birth yr |
|---|---|---|---|---|
| J Sullivan | Son | — | 41 | ~1899 |
| Philip Sullivan | Son | — | 44 | ~1896 |
| Mary Sullivan | Spouse | — | 70 | ~1870 |
| Cornelius Sullivan | Head | — | 78 | ~1862 |
Census Appearances
1920
Will, Illinois
Head, age 54
Will, Illinois · implied b. ~1866 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Cornelius |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1888 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | section hand |
| Industry | Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth Country | Ireland |
| Year of Naturalization | 1895 |
| Birthplace (normalized) | ireland |
1930
Will, Illinois
Head, age 65
Will, Illinois · implied b. ~1865 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Cornelius |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1886 |
| Age at First Marriage | 26 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Laborer |
| Industry | E. J. & E. R.R. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 4000 |
| Radio Set | R |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Will-County, Illinois
Head, age 78
Will-County, Illinois · implied b. ~1862 — 4 household members
| Surname | Sullivan |
| Given Name | Cornelius |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 78 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Joliet |
| 1935 Residence (County) | Will |
| Naturalization Status | Naturalized |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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.
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This person
Anchor record
Cornelius Sullivan
Head · 1940 · age 78 · b. ~1862 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Will-County, Illinois
Open full size
1940 US Federal Census — Will-County, Illinois
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00907-00883)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John Johnson | 45 | Head | Seamstress | Illinois |
| 42 | Fern Johnson | 25 | daughter | Bookkeeper & Typ. | Illinois |
| 43 | Elizabeth Baskerville | 77 | Head | — | Pennsylvania |
| 44 | Pearl Baskerville | 50 | daughter | — | Illinois |
| 45 | Raymond P. Button | 57 | Head | Driver | Illinois |
| 46 | Elizabeth Button | 44 | Wife | — | Illinois |
| 47 | Raymond Jr. Button | 20 | Son | Stock Man | Illinois |
| 48 | Thomas Baskerville | 57 | Head | Pharmacist | Illinois |
| 49 | Laura Baskerville | 58 | Wife | — | Indiana |
| 50 | Paul Dempsey | 31 | Head | Boilermaker | Illinois |
| 51 | Helen Dempsey | 35 | Wife | Saleslady | Illinois |
| 52 | Etta Hall | 60 | Head | — | Illinois |
| 53 | Thomas Snell | 64 | Brother | Yard Helper | Illinois |
| 54 | Melvin Brougham | 31 | Son | Machinist | Illinois |
| 55 | Charles Morrow | 59 | Head | Salesman | West Virginia |
| 56 | Ethel Morrow | 58 | Wife | — | West Virginia |
| 57 | Charles Williamson | 42 | Head | Night Watchman | Illinois |
| 58 | Lucile Williamson | 40 | Wife | — | Illinois |
| 59 | Jack Williamson | 22 | Son | Musician | Illinois |
| 60 | Everett Williamson | 16 | Son | — | Illinois |
| 61 | James Williamson | 2 | Son | — | Illinois |
| 62 | John Neilson | 34 | Head | Salesman | Illinois |
| 63 | Eunice Neilson | 38 | Wife | — | Illinois |
| 64 | John Jr. Neilson | 12 | Son | — | Illinois |
| 65 | Joyce Neilson | 7 | daughter | — | Illinois |
| 66 | Joan Neilson | 7 | daughter | — | Illinois |
| 67 | Maud Shipley | 62 | aunt | — | Illinois |
| 68 | Katherine Milligan | 80 | Head | — | Illinois |
| 69 | Grace Milligan | 54 | daughter | Saleslady | Illinois |
| 70 | Regina Milligan | 39 | daughter | Finisher | Illinois |
| 71 | Eldred Johnson | 70 | Head | Carpenter | Sweden |
| 72 | Alma Johnson | 64 | Wife | — | Sweden |
| 73 | Geraldine Johnson | 31 | daughter | Bookkeeper | Illinois |
| 74 | Edwin H. Jones | 66 | Head | — | England |
| 75 | Olive M. Jones | 66 | Wife | — | Illinois |
| 76 | Cornelius Sullivan THIS PERSON | 78 | Head | — | Ireland |
| 77 | Mary Sullivan | 70 | Wife | — | Ireland |
| 78 | Philip Sullivan | 44 | Son | — | Illinois |
| 79 | J. Leo Sullivan | 41 | Son | Printer | Illinois |
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)