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John Mccarthy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Rock-Island-County, Illinois
Our Model Tree links this John Mccarthy across the 1920, 1930 and 1940 US Censuses in Rock-Island-County, Illinois (XGBoost, ~Confirmed), with identified parents Martin & Martin — first a head (b.~1910), then head of a 3-person household.
Age 30
b. ~1910
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Rock-Island-County, Illinois |
| Surname | McCarthy |
| Given Name | John T. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Rock Island |
| 1935 Residence (County) | Rock Island |
| Additional Details | |
| Occupation | Laborer |
| Industry | Iron Foundry |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 988 |
| Highest Grade | Hs 4 |
| 1935 Residence | Illinois |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Laborer |
| Township / Ward | Andalusia Village |
| Est. Birth Year | ~1910 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Marlene Mccarthy | Daughter | — | 5 | ~1935 |
| John Mccarthy | Head | — | 30 | ~1910 |
| Dorothy Mccarthy | Spouse | — | 29 | ~1911 |
Census Appearances
1920
Rock Island, …
Son, age 10
Rock Island, Illinois · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Rock Island, …
Son, age 20
Rock Island, Illinois · implied b. ~1910 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Pennsylvania |
| Occupation | Ship Clerk |
| Industry | Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Rock-Island-County, Illinois
Head, age 30
Rock-Island-County, Illinois · implied b. ~1910 — 3 household members
| Surname | McCarthy |
| Given Name | John T. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Rock Island |
| 1935 Residence (County) | Rock Island |
| Occupation | Laborer |
| Industry | Iron Foundry |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 988 |
| Highest Grade | Hs 4 |
| 1935 Residence | Illinois |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Mccarthy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Martin Mccarthy (~0.92 confidence) and father Martin Mccarthy (~0.92 confidence) and mother Elizabeth Mccarthy (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Martin Mccarthy
b. ~1870
Source father
● Household
· direct · ~0.92
Father
Martin Mccarthy
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Elizabeth Mccarthy
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mccarthy
Head · 1940 · age 30 · b. ~1910 · 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 — Rock-Island-County, Illinois
Open full size
1940 US Federal Census — Rock-Island-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00874-00012)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Earl Finley | 58 | Head | Commercial Fisherman | Illinois |
| 2 | Phoebe J. Finley | 53 | Wife | Laundress | Illinois |
| 3 | Donald E. Finley | 20 | Son | Button Cutter | Illinois |
| 4 | David E. Finley | 52 | Brother | Commercial Fisherman | Illinois |
| 5 | Andrew W. Finley | 36 | Head | Truck Driver | Illinois |
| 6 | Zella G. Finley | 29 | Wife | — | Illinois |
| 7 | Andrew W. Jr. Finley | 11 | Son | — | Illinois |
| 8 | Shirley J. Finley | 9 | Daughter | — | Illinois |
| 9 | Betty J. Finley | 7 | Daughter | — | Illinois |
| 10 | Clara Beaumont | 77 | Head | — | Illinois |
| 11 | George L. Beaumont | 57 | Son | Carpenter | Illinois |
| 12 | Albert L. Beaumont | 55 | Son | Laborer | Illinois |
| 13 | John T. Mccarthy THIS PERSON | 30 | Head | Laborer | Iowa |
| 14 | Dorothy L. Mccarthy | 29 | Wife | — | Illinois |
| 15 | Marlene C. Mccarthy | 5 | Daughter | — | Illinois |
| 16 | Enoch E. Rae | 41 | Head | Night Watchman | Illinois |
| 17 | Nancy E. Rae | 39 | Wife | — | Illinois |
| 18 | William C. Rae | 19 | Son | New Worker | Illinois |
| 19 | Leslie E. Rae | 16 | Son | New Worker | Illinois |
| 20 | James F. Rae | 11 | Son | — | Illinois |
| 21 | Susan D. Rosenbaum | 79 | Mother-in-law | — | Illinois |
| 22 | Lester H. Kain | 27 | Head | Laborer | Illinois |
| 23 | Marion Kain | 22 | Wife | — | Illinois |
| 24 | Edward A. Gullapp | 66 | Head | Carpenter | Illinois |
| 25 | Mary E. Gullapp | 66 | Wife | — | Illinois |
| 26 | Charles Fordham | 67 | Head | — | Illinois |
| 27 | Ernest Snell | 32 | Head | Laborer | Illinois |
| 28 | Dale D. Snell | 12 | Son | Laborer | Illinois |
| 29 | Harry L. Mcclockey | 62 | Head | — | Illinois |
| 30 | Bessie Mcclockey | 54 | Wife | — | Illinois |
| 31 | John H. Griffin | 64 | Head | Painter | Illinois |
| 32 | Elmer L. Stewart | 39 | Head | Laborer | Alberta |
| 33 | Josephine Stewart | 35 | Wife | — | Illinois |
| 34 | Marilyn Stewart | 7 | Daughter | — | Alberta |
| 35 | Barbara Jean Stewart | 2 | Daughter | — | Alberta |
| 36 | Anna Tompkins | 74 | Head | — | Illinois |
| 37 | James V. Tompkins | 43 | Son | Button Cutter | Illinois |
| 38 | Mildred Jones | 36 | Daughter | — | Illinois |
| 39 | Earl L. Jones | 8 | Grandson | — | Illinois |
| 40 | Anna Lee Jones | 7 | Granddaughter | — | Illinois |
Pedigree Summary
John
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)