JC
John Cassidy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Peoria-County, Illinois
Our Model Tree links this John Cassidy across the 1920, 1930 and 1940 US Censuses in Peoria-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1879), then head of a 7-person household.
Age 61
b. ~1879
Male
Head
Born: England
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Peoria-County, Illinois |
| Surname | Cassidy |
| Given Name | John S. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Peoria |
| 1935 Residence (County) | Peoria |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | machinist |
| Industry | Tractor plant |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1520 |
| Highest Grade | 6 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
| Occupation | Machinist |
| Township / Ward | Peoria |
| Est. Birth Year | ~1879 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Agnes Cassidy | Daughter | — | 24 | ~1916 |
| Mable Cassidy | Daughter | — | 21 | ~1919 |
| John Cassidy | Head | — | 61 | ~1879 |
| Richard Cassidy | Son | — | 12 | ~1928 |
| Thomas Cassidy | Son | — | 18 | ~1922 |
| Robert Cassidy | Son | — | 15 | ~1925 |
| Mary Cassidy | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Peoria, Illinois
Head, age 41
Peoria, Illinois · implied b. ~1879 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | John J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | England |
| Year of Immigration | 1890 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | England |
| Occupation | machinist |
| Industry | tractor plant |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | England |
| Year of Naturalization | 1897 |
| Birthplace (normalized) | england |
1930
Peoria, Illinois
Head, age 51
Peoria, Illinois · implied b. ~1879 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | John E. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | England |
| Naturalization Status | Naturalized |
| Year of Immigration | 1890 |
| Age at First Marriage | 24 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | England |
| Occupation | Machinist |
| Industry | Tractor Fact |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 2000 |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
Peoria-County, Illinois
Head, age 61
Peoria-County, Illinois · implied b. ~1879 — 7 household members
| Surname | Cassidy |
| Given Name | John S. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Peoria |
| 1935 Residence (County) | Peoria |
| Naturalization Status | Naturalized |
| Occupation | machinist |
| Industry | Tractor plant |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1520 |
| Highest Grade | 6 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
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 Cassidy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Cassidy
Head · 1940 · age 61 · b. ~1879 · Illinois
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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-t0627-00919-00556)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary H. Garrett | 18 | Daughter | Cookie Packer | Illinois |
| 42 | Clifford D. Garrett | 17 | Son | Bus Boy | Illinois |
| 43 | Pauline A. Garrett | 13 | Daughter | — | Illinois |
| 44 | John H. Garrett | 10 | Son | — | Illinois |
| 45 | Barbara J. Garrett | 7 | Daughter | — | Illinois |
| 46 | William G. Michael | 50 | Head | Fireman | Illinois |
| 47 | Violet R.O. Michael | 43 | Wife | — | Illinois |
| 48 | George J. Michael | 19 | Son | Stock Clerk | Illinois |
| 49 | Paul F. Michael | 16 | Son | — | Illinois |
| 50 | Charles R. Michael | 14 | Son | — | Illinois |
| 51 | Frederick E. Michael | 9 | Son | — | Illinois |
| 52 | Herman A. Grider | 52 | Head | Butcher | Kentucky |
| 53 | Victoria Grider | 50 | Wife | — | Kentucky |
| 54 | Elena Grider | 19 | Daughter | — | Illinois |
| 55 | Ruth F. Grider | 16 | Daughter | — | Illinois |
| 56 | Joellen Grider | 11 | Daughter | — | Illinois |
| 57 | Robert J. Bee | 52 | Head | Wire Drawer | Illinois |
| 58 | Nell J. Bee | 47 | Wife | — | Illinois |
| 59 | Keith J. Bee | 12 | Daughter | — | Illinois |
| 60 | Betty J. Bee | 10 | Daughter | — | Illinois |
| 61 | Lois J. Bee | 6 | Daughter | — | Illinois |
| 62 | Robert Jr. Bee | 4 | Son | — | Illinois |
| 63 | Eugene H. Decker | 20 | Step son | Truck Driver | Illinois |
| 64 | Geraldine R. Decker | 20 | Step daughter | — | Illinois |
| 65 | Charles E. Decker | 18 | Step son | — | Illinois |
| 66 | John S. Cassidy THIS PERSON | 61 | Head | Machinist | England |
| 67 | Mary Cassidy | 57 | Wife | — | Iowa |
| 68 | Agnes J. Cassidy | 24 | Daughter | Stenographer | Illinois |
| 69 | Mable R. Cassidy | 21 | Daughter | Sales Girl | Illinois |
| 70 | Thomas B. Cassidy | 18 | Son | — | Illinois |
| 71 | Robert A. Cassidy | 15 | Son | — | Illinois |
| 72 | Richard Cassidy | 12 | Son | — | Illinois |
| 73 | Albert Amy | 54 | Head | Laborer | Illinois |
| 74 | Carrie E. Amy | 53 | Wife | House Work | Illinois |
| 75 | Robert J. Amy | 19 | Son | — | Illinois |
| 76 | Fred J. Sudat | 60 | Head | — | Illinois |
| 77 | Lizzie M. Sudat | 55 | Wife | — | Illinois |
| 78 | Margaret M. Sudat | 18 | Daughter | Laundry | Illinois |
| 79 | Paul A. Sudat | 17 | Son | New Worker | Illinois |
| 80 | Richard V. Sudat | 12 | Son | — | Illinois |
Related Census Records
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)