JC
James Connolly — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this James Connolly across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 8-person household.
Age 17
b. ~1923
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Connolly |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | La Grange Park Village |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | La Grange Park Village |
| Est. Birth Year | ~1923 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Dennis Connolly | Head | — | 50 | ~1890 |
| James Connolly | Son | — | 17 | ~1923 |
| Elizabeth Connolly | Daughter | — | 16 | ~1924 |
| Paul Connolly | Son | — | 24 | ~1916 |
| Jean Connolly | Daughter | — | 21 | ~1919 |
| Hazel Connolly | Spouse | — | 49 | ~1891 |
| Harold Connolly | Son | — | 19 | ~1921 |
| Edmund Connolly | Son | — | 20 | ~1920 |
Census Appearances
1930
Cook, Illinois
Son, age 7
Cook, Illinois · implied b. ~1923 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connolly |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Home Owned/Rented | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 17
Cook-County, Illinois · implied b. ~1923 — 8 household members
| Surname | Connolly |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | La Grange Park Village |
| 1935 Residence (County) | Cook |
| Hours Worked | 0 |
| Highest Grade | Hs 3 |
| 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 James Connolly across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Connolly
Son · 1940 · age 17 · b. ~1923 · Illinois
★ You are viewing this record
Sibling
Edmund Connolly
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Connolly
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Connolly
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jean Connolly
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Connolly
Sibling · 1940 · age 24
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-t0627-00787-00199)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frances Hohn | 80 | Mother-in-law | — | Germany |
| 2 | Roscoe W. Barbour | 32 | Head | Organization | Colorado |
| 3 | Rachel Barbour | 26 | Wife | — | California |
| 4 | Rachel A. Barbour | 4 | Daughter | — | Illinois |
| 5 | Jeanne R. Barbour | 4 | Daughter | — | Illinois |
| 6 | Gayle K. Barbour | 2 | Daughter | — | Illinois |
| 7 | Anna M. Horvath | 18 | Maid | Maid | Ohio |
| 8 | Dennis J. Connolly | 50 | Head | Supervisor | Illinois |
| 9 | Hazel Connolly | 49 | Wife | — | Illinois |
| 10 | Paul Connolly | 24 | Son | Relay Adjuster | Illinois |
| 11 | Jean Connolly | 21 | Daughter | Stenographer | Illinois |
| 12 | Edmund Connolly | 20 | Son | Apprentice | Illinois |
| 13 | Harold Connolly | 19 | Son | Apprentice | Illinois |
| 14 | James Connolly THIS PERSON | 17 | Son | — | Illinois |
| 15 | Elizabeth Connolly | 16 | Daughter | — | Illinois |
| 16 | Eugene P. Campbell | 51 | Head | Office Work | Michigan |
| 17 | Marjorie Campbell | 49 | Wife | — | New York |
| 18 | Roderick Campbell | 13 | Son | — | Illinois |
| 19 | William H. Thunick | 33 | Head | Sales Engineer | West Virginia |
| 20 | Josephine Thunick | 35 | Wife | — | Pennsylvania |
| 21 | Patricia A. Thunick | 4 | Daughter | — | Pennsylvania |
| 22 | Joseph F. Sheen | 42 | Head | Lawyer | Illinois |
| 23 | Anne Sheen | 37 | Wife | — | Illinois |
| 24 | Joseph J. Sheen | 15 | Son | — | Illinois |
| 25 | John Sheen | 14 | Son | — | Illinois |
| 26 | Joan Sheen | 12 | Daughter | — | Illinois |
| 27 | Robert Sheen | 10 | Son | — | Illinois |
| 28 | Suzanne Sheen | 8 | Daughter | — | Illinois |
| 29 | Fulton Sheen | 6 | Son | — | Illinois |
| 30 | Thomas Sheen | 1 | Son | — | Illinois |
| 31 | Ruth Miller | 22 | Maid | Maid | Illinois |
| 32 | Earl W. Lodsberg | 47 | Head | Tool & Die Maker | Iowa |
| 33 | Dorothy Lodsberg | 45 | Wife | — | Iowa |
| 34 | Louise Lodsberg | 14 | Daughter | — | Iowa |
| 35 | Earl Jr. Lodsberg | 10 | Son | — | Iowa |
| 36 | Eva Lodsberg | 84 | Mother | — | Illinois |
| 37 | Clarence L. Bertram | 58 | Head | Record Clerk | Illinois |
| 38 | Gertrude Bertram | 59 | Wife | — | Illinois |
| 39 | Harry E. Dayton | 25 | Son-in-law | Layout Hire Clerk | Tennessee |
| 40 | Isabelle Dayton | 25 | Daughter | Saleslady | 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)