CS
Cornelius Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Lake-County, Illinois
Our Model Tree links this Cornelius Sullivan across the 1920, 1930 and 1940 US Censuses in Lake-County, Illinois (XGBoost, ~Confirmed), with identified parents John & John — first a head (b.~1908), then head of a 7-person household.
Age 32
b. ~1908
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Lake-County, Illinois |
| Surname | Sullivan |
| Given Name | Cornelius |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Waukegan City |
| 1935 Residence (County) | Lake |
| Additional Details | |
| Occupation | Proof reading |
| Industry | W.P.A. Vision & car project |
| Class of Worker | GW |
| Hours Worked | 32 |
| Income (1939) | 575 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Proof Reading |
| Township / Ward | Waukegan 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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Cornelius | Age | Birth yr |
|---|---|---|---|---|
| Maureen Sullivan | Daughter | — | 2 | ~1938 |
| Mary Sullivan | Other | — | 65 | ~1875 |
| Marion Sullivan | Spouse | — | 32 | ~1908 |
| Florence Sullivan | Other | — | 26 | ~1914 |
| Jermiah Sullivan | Son | — | 6 | ~1934 |
| Cornelius Sullivan | Head | — | 32 | ~1908 |
| John Sullivan | Other | — | 70 | ~1870 |
Census Appearances
1920
Lake, Illinois
Son, age 12
Lake, Illinois · implied b. ~1908 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Cornelius |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Alsace Ger |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Lake, Illinois
Son, age 21
Lake, Illinois · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Cornelius |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Alsace-Lorraine |
| Occupation | attendant |
| Industry | Gasoline Filling Sta |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Lake-County, Illinois
Head, age 32
Lake-County, Illinois · implied b. ~1908 — 7 household members
| Surname | Sullivan |
| Given Name | Cornelius |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Waukegan City |
| 1935 Residence (County) | Lake |
| Occupation | Proof reading |
| Industry | W.P.A. Vision & car project |
| Class of Worker | GW |
| Hours Worked | 32 |
| Income (1939) | 575 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| 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 Cornelius 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 John Sullivan (~0.92 confidence) and mother Mary Sullivan (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Sullivan
b. ~1873
Source father
● Household
· direct · ~0.92
Father
John Sullivan
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Mary Sullivan
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Cornelius Sullivan
Head · 1940 · age 32 · b. ~1908 · Illinois
★ 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 — Lake-County, Illinois
Open full size
1940 US Federal Census — Lake-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00830-00700)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Julius Ruta | 38 | Head | Coal Shuts Oper. | Illinois |
| 42 | Priscilla Ruta | 31 | Wife | — | Illinois |
| 43 | Thad Ruta | 12 | Step-son | — | Illinois |
| 44 | Marion Dean | 39 | Lodger | Sewing Machine Oper. | Illinois |
| 45 | Esther Hill | 26 | Lodger | Housework | Illinois |
| 46 | Harry Laffredi | 21 | Head | Presser | Illinois |
| 47 | Lorena Laffredi | 21 | Wife | — | Illinois |
| 48 | Ralph H. Laffredi | 0 | Son | — | Illinois |
| 49 | Tony Laffredi | 26 | Head | Planter | Illinois |
| 50 | Ethel Laffredi | 20 | Wife | — | Illinois |
| 51 | Edward Braden | 50 | Head | — | Tennessee |
| 52 | Vandla Braden | 52 | Wife | — | Sweden |
| 53 | Margaret Braden | 16 | Daughter | — | Illinois |
| 54 | Dorothy Braden | 15 | Daughter | — | Illinois |
| 55 | Donald Braden | 13 | Son | — | Illinois |
| 56 | Edith Mclernon | 36 | Head | Stenographer | Illinois |
| 57 | Merilyn Mclernon | 13 | Daughter | — | Illinois |
| 58 | William Mclernon | 11 | Son | — | Illinois |
| 59 | Barbra Mclernon | 10 | Daughter | — | Illinois |
| 60 | Cornelius Sullivan THIS PERSON | 32 | Head | Proof Reading | Illinois |
| 61 | Marion Sullivan | 32 | Wife | Retail Sales Lady | Iowa |
| 62 | Jermiah Sullivan | 6 | Son | — | Illinois |
| 63 | Maureen Sullivan | 2 | Daughter | — | Illinois |
| 64 | John Sullivan | 70 | Father | — | Trust-Free-State |
| 65 | Mary Sullivan | 65 | Mother | — | France |
| 66 | Florence Sullivan | 26 | Sister | — | Illinois |
| 67 | Bruno Ehnerd | 66 | Head | Checker | Germany |
| 68 | John Ehnerd | 42 | Son | Auto Mechanic | Germany |
| 69 | Margaret Ehnerd | 34 | Daughter-in-law | — | Illinois |
| 70 | Maxine Ehnerd | 19 | Grand Daughter | Multigrapher | Illinois |
| 71 | William Ehnerd | 13 | Grand Son | — | New Jersey |
| 72 | Maria Danielson | 65 | Head | — | Sweden |
| 73 | Gunard Danielson | 23 | Son | Time Keeper | Illinois |
| 74 | Stanley Danielson | 30 | Son | Manager Retail Grocery | Illinois |
| 75 | Mabel Danielson | 26 | Daughter-in-law | Telephone Oper. | Wisconsin |
| 76 | Ronald Danielson | 7 | Grand-Son | — | Illinois |
| 77 | Stanley Jr. Danielson | 1 | Grand-Son | — | Illinois |
| 78 | Clifford Drinkwine | 26 | Head | Tester Of Wire | Illinois |
| 79 | Alice Drinkwine | 23 | Wife | — | Illinois |
| 80 | Patsy Drinkwine | 1 | Daughter | — | Illinois |
Pedigree Summary
Cornelius
Gen 1 · 3 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)