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John Dempsey — 1940 US Census Record
Model Tree available1940 United States Federal Census · Jo-Daviess-County, Illinois
Our Model Tree links this John Dempsey across the 1920, 1930 and 1940 US Censuses in Jo-Daviess-County, Illinois (XGBoost, ~Confirmed), with identified parents Mary — first a son (b.~1898), then head of a 5-person household.
Age 42
b. ~1898
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Jo-Daviess-County, Illinois |
| Surname | Dempsey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Galena City |
| 1935 Residence (County) | Jo Daviess |
| Additional Details | |
| Occupation | Bridge Carpenter |
| Industry | I.C. R.R. |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 316 |
| Highest Grade | H 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Bridge Carpenter |
| Township / Ward | Galena City |
| Est. Birth Year | ~1898 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Dempsey | Son | — | 42 | ~1898 |
| Susan Mccafferty | Other | — | 59 | ~1881 |
| Joseph Dempsey | Son | — | 39 | ~1901 |
| Katherine Mccafferty | Other | — | 69 | ~1871 |
| Mary Dempsey | Head | — | 73 | ~1867 |
Census Appearances
1920
Jo Daviess, …
Son, age 21
Jo Daviess, Illinois · implied b. ~1899 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | John F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Carpenter |
| Industry | Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Jo Daviess, …
Son, age 32
Jo Daviess, Illinois · implied b. ~1898 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | John P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Bridge Foreman |
| Industry | Central R. R. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Jo-Daviess-County, Illinois
Son, age 42
Jo-Daviess-County, Illinois · implied b. ~1898 — 5 household members
| Surname | Dempsey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Galena City |
| 1935 Residence (County) | Jo Daviess |
| Occupation | Bridge Carpenter |
| Industry | I.C. R.R. |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 316 |
| Highest Grade | H 8 |
| 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 John Dempsey across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Dempsey (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Dempsey
b. ~1867
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Dempsey
Son · 1940 · age 42 · b. ~1898 · Illinois
★ You are viewing this record
Sibling
Joseph Dempsey
Sibling · 1940 · age 39
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 — Jo-Daviess-County, Illinois
Open full size
1940 US Federal Census — Jo-Daviess-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00817-00537)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Elizabeth Thompson | 72 | Head | — | Illinois |
| 2 | Esther Logan | 70 | Sister | Laundress | Illinois |
| 3 | Wm Luecke | 25 | Head | — | Illinois |
| 4 | Ivey Johnson | 58 | Head | Bellhop | Illinois |
| 5 | Morris Johnson | 49 | Wife | — | Missouri |
| 6 | Robert Johnson | 29 | Son | Labor | Kansas |
| 7 | Beauford Johnson | 17 | Son | At School | Illinois |
| 8 | Morris Johnson | 14 | Daughter | Janitor Work | Illinois |
| 9 | Meredith Johnson | 8 | Daughter | — | Illinois |
| 10 | Lalhetta Johnson | 6 | Daughter | — | Illinois |
| 11 | Clarence Voienchek | 53 | Head | — | Illinois |
| 12 | Robert Voienchek | 32 | Son | Salesman | Iowa |
| 13 | George L. Martin | 31 | Head | Moulder | Illinois |
| 14 | Bernice Martin | 29 | Wife | — | Illinois |
| 15 | Colleen Martin | 8 | Daughter | — | Illinois |
| 16 | Shirley Jean Martin | 8 | Daughter | — | Illinois |
| 17 | Jane Ann Martin | 5 | Daughter | — | Illinois |
| 18 | Claude Rushti | 40 | Head | Auto Mechanic | Wisconsin |
| 19 | Alverna Rushti | 32 | Wife | — | Illinois |
| 20 | Gloria Rushti | 8 | Daughter | — | Illinois |
| 21 | Ross Rushti | 4 | Son | — | Illinois |
| 22 | Harvey Don Rushti | 2 | Son | — | Illinois |
| 23 | Wm Luecke | 54 | Head | Bridge Foreman | Illinois |
| 24 | Agnes Luecke | 57 | Wife | — | Illinois |
| 25 | Mary Dempsey | 73 | Head | — | Illinois |
| 26 | John Dempsey THIS PERSON | 42 | Son | Bridge Carpenter | Illinois |
| 27 | Joseph Dempsey | 39 | Son | Bridge Carpenter | Illinois |
| 28 | Katherine Mccafferty | 69 | Sister | — | Illinois |
| 29 | Susan Mccafferty | 59 | Sister | Saleswoman | Illinois |
| 30 | Ross Marsden | 45 | Head | Merchant | Illinois |
| 31 | Charlotte Marsden | 48 | Wife | — | Illinois |
| 32 | Rita Marsden | 18 | Daughter | — | Illinois |
| 33 | Walter Marsden | 15 | Son | Newsboy | Illinois |
| 34 | James Marsden | 10 | Son | — | Illinois |
| 35 | Ross Jr. Marsden | 2 | Son | — | Illinois |
| 36 | W. P. Tidder | 64 | Head | — | Germany |
| 37 | Cora Tidder | 58 | Wife | Merchant | Missouri |
| 38 | Marie Tidder | 26 | Daughter | Beauty Operator | Iowa |
| 39 | Roland Tidder | 14 | Son | — | Iowa |
| 40 | Garnett Catlett | 35 | Head | Electrician | Kentucky |
Related Census Records
Pedigree Summary
John + 1 sibling
Gen 1 · 1 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)