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John Mcgrath — 1940 US Census Record
Model Tree available1940 United States Federal Census · Peoria-County, Illinois
Our Model Tree links this John Mcgrath across the 1920, 1930 and 1940 US Censuses in Peoria-County, Illinois (XGBoost, ~Confirmed), with identified parents William & Minnie — first a son (b.~1919), then head of a 5-person household.
Age 21
b. ~1919
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Peoria-County, Illinois |
| Surname | McGrath |
| Given Name | John L |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Peoria City |
| 1935 Residence (County) | Peoria |
| Additional Details | |
| Occupation | Laborer |
| Industry | Printing Co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1040 |
| Highest Grade | H 2 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Laborer |
| Township / Ward | Peoria City |
| Est. Birth Year | ~1919 |
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 |
|---|---|---|---|---|
| Frances Mcgrath | Daughter | — | 28 | ~1912 |
| Bernice Mcgrath | Daughter | — | 24 | ~1916 |
| William Mcgrath | Head | — | 60 | ~1880 |
| John Mcgrath | Son | — | 21 | ~1919 |
| Minnie Mcgrath | Spouse | — | 55 | ~1885 |
Census Appearances
1920
Peoria, Illinois
Son, age 1
Peoria, Illinois · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | John L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Peoria, Illinois
Son, age 11
Peoria, Illinois · implied b. ~1919 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGraith |
| Given Name | John L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Peoria-County, Illinois
Son, age 21
Peoria-County, Illinois · implied b. ~1919 — 5 household members
| Surname | McGrath |
| Given Name | John L |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Peoria City |
| 1935 Residence (County) | Peoria |
| Occupation | Laborer |
| Industry | Printing Co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1040 |
| Highest Grade | H 2 |
| 1935 Residence | Same house |
| 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 Mcgrath across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father William Mcgrath (~0.92 confidence) and mother Minnie Mcgrath (~0.92 confidence) and father William Mcgrath (~0.92 confidence) and mother Wilhelmina Mcgrath (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Mcgrath
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Minnie Mcgrath
b. ~1885
Source mother
● Household
· direct · ~0.92
Father
William Mcgrath
b. ~1891
Source father
● Household
· direct · ~0.92
Mother
Wilhelmina Mcgrath
b. ~1895
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mcgrath
Son · 1940 · age 21 · b. ~1919 · Illinois
★ You are viewing this record
Sibling
Frances Mcgrath
Sibling · 1940 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernice Mcgrath
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 — Peoria-County, Illinois
Open full size
1940 US Federal Census — Peoria-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00919-00609)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Amalia P Williams | 45 | wife | — | Illinois |
| 2 | Wilbur H Williams | 17 | son | — | Illinois |
| 3 | Willa Mae Williams | 8 | daughter | — | Illinois |
| 4 | John W Griffin | 46 | head | Laborer | Illinois |
| 5 | Etta May Griffin | 46 | wife | — | Illinois |
| 6 | William Knoll | 72 | head | — | Germany |
| 7 | Augusta Knoll | 69 | wife | — | Germany |
| 8 | Clara Knoll | 30 | daughter | Stenographer | Illinois |
| 9 | Walter J Knoll | 39 | head | Inspector | Illinois |
| 10 | Cirona M Knoll | 38 | wife | — | Illinois |
| 11 | Clarice V Knoll | 12 | daughter | — | Illinois |
| 12 | Raymond W Knoll | 10 | son | — | Illinois |
| 13 | Esther M Knoll | 5 | daughter | — | Illinois |
| 14 | Eileen R Knoll | 4 | daughter | — | Illinois |
| 15 | August J Schaal | 44 | head | Laborer | Illinois |
| 16 | Ruby M Schaal | 43 | wife | — | Illinois |
| 17 | Irene P Schaal | 18 | daughter | — | Illinois |
| 18 | Patrick L Mcguire | 61 | head | Watchman | Illinois |
| 19 | Bertha Mcguire | 60 | wife | — | Germany |
| 20 | Leona M Mcguire | 20 | daughter | Teacher | Illinois |
| 21 | Alberta M Mcguire | 19 | daughter | Office Clerk | Illinois |
| 22 | John Behm | 87 | father | — | Germany |
| 23 | Sophia L Knew | 47 | head | Seamstress | Illinois |
| 24 | Evelyn D Knew | 25 | daughter | Bottling | Illinois |
| 25 | Ardice B Knew | 14 | daughter | — | Illinois |
| 26 | Noden D Van Norman | 63 | head | Mail Carrier | Illinois |
| 27 | Faye Van Norman | 57 | wife | — | Ohio |
| 28 | Lee Van Norman | 39 | son | Detective | Illinois |
| 29 | Roy Van Norman | 34 | son | Machinist | Illinois |
| 30 | Georgia Van Norman | 22 | daughter | Clerk | Illinois |
| 31 | Mattie Powers | 64 | head | — | Illinois |
| 32 | Lester W Powers | 35 | head | Service Supervisor | Illinois |
| 33 | Velma G Powers | 32 | wife | — | Illinois |
| 34 | Francis W Downing | 19 | head | Apprentice Machinist | Illinois |
| 35 | Eileen M Downing | 19 | wife | — | Illinois |
| 36 | William P Mcgrath | 60 | head | Laborer | Iowa |
| 37 | Minnie F Mcgrath | 55 | wife | — | Illinois |
| 38 | Frances M Mcgrath | 28 | daughter | Seamstress | Illinois |
| 39 | Bernice H Mcgrath | 24 | daughter | Stenographer | Illinois |
| 40 | John L Mcgrath THIS PERSON | 21 | son | Laborer | Illinois |
Pedigree Summary
John + 2 siblings
Gen 1 · 4 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)