WA
William Arnold — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Arnold across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Peter & Katherine — first a head (b.~1899), then head of a 4-person household.
Age 41
b. ~1899
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Arnold |
| Given Name | William H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Berwyn City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Agent |
| Industry | General Insurance |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 2480 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Agent |
| Township / Ward | Berwyn City |
| Est. Birth Year | ~1899 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Arlene Arnold | Daughter | — | 12 | ~1928 |
| William Arnold | Head | — | 41 | ~1899 |
| William Arnold | Son | — | 15 | ~1925 |
| Stella Arnold | Spouse | — | 39 | ~1901 |
Census Appearances
1920
Cook, Illinois
Son, age 21
Cook, Illinois · implied b. ~1899 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Arnoldi |
| Given Name | William |
| 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 | Bookkeeper |
| Industry | Office |
| Class of Worker | S |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 31
Cook, Illinois · implied b. ~1899 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Arnoldi |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Bkkeeper |
| Industry | Cold Storage |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 41
Cook-County, Illinois · implied b. ~1899 — 4 household members
| Surname | Arnold |
| Given Name | William H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Berwyn City |
| 1935 Residence (County) | Cook |
| Occupation | Agent |
| Industry | General Insurance |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 2480 |
| Highest Grade | H 4 |
| 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 William Arnold across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Peter Arnoldi (~0.92 confidence) and mother Katherine Arnoldi (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Peter Arnoldi
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Katherine Arnoldi
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Arnold
Head · 1940 · age 41 · b. ~1899 · 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 — 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-t0627-00772-00550)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Minnie Wissmann | 57 | Wife | — | Illinois |
| 42 | Bert S. Hicks | 55 | Head | Proprietor | Illinois |
| 43 | Ella Hicks | 49 | Wife | Clerk Office | Illinois |
| 44 | Robert Hicks | 16 | Son | — | Illinois |
| 45 | Joseph Henry | 49 | Head | Coal Traffic Representative | Pennsylvania |
| 46 | Florence Henry | 47 | Wife | — | Illinois |
| 47 | Ruth Henry | 13 | Daughter | — | Illinois |
| 48 | Frank Koller | 40 | Head | Sergeant | Illinois |
| 49 | Elsie Koller | 41 | Wife | — | Missouri |
| 50 | Frank A. Koller | 17 | Son | — | Illinois |
| 51 | William H. Arnold THIS PERSON | 41 | Head | Agent | Illinois |
| 52 | Stella M. Arnold | 39 | Wife | — | Illinois |
| 53 | William E. Arnold | 15 | Son | — | Illinois |
| 54 | Arlene D. Arnold | 12 | Daughter | — | Illinois |
| 55 | Joseph Cerny | 37 | Head | Manager | Czechoslovakia |
| 56 | Mary Cerny | 32 | Wife | — | Czechoslovakia |
| 57 | Joseph Jr. Cerny | 9 | Son | — | Illinois |
| 58 | James Cerny | 3 | Son | — | Illinois |
| 59 | Mary Turk | 50 | Mother-in-law | — | Czechoslovakia |
| 60 | Charles Steinbracher | 57 | Head | Motorman | Illinois |
| 61 | Mary Steinbracher | 56 | Wife | — | Illinois |
| 62 | George Trezyk | 23 | Son-in-law | Maintenance Man | Illinois |
| 63 | Charlotte Trezyk | 22 | Daughter | — | Illinois |
| 64 | Edward Peternell | 57 | Head | Toolmaker | Germany |
| 65 | Susan Peternell | 42 | Wife | — | Germany |
| 66 | Edward Jr. Peternell | 21 | Son | Salesman | Illinois |
| 67 | Carl Peternell | 15 | Son | — | Illinois |
| 68 | Frieda Peternell | 22 | Daughter | — | Illinois |
| 69 | Joseph F. Kessel | 42 | Head | Plumber | Illinois |
| 70 | Rose Kessel | 38 | Wife | — | Wisconsin |
| 71 | David Kessel | 10 | Son | — | Illinois |
| 72 | Keith Kessel | 3 | Daughter | — | Illinois |
| 73 | Frank King | 45 | Head | Toolmaker | Hungary |
| 74 | Anna King | 40 | Wife | — | Illinois |
| 75 | Lorraine King | 13 | Daughter | — | Illinois |
| 76 | Betty Ann King | 6 | Daughter | — | Illinois |
| 77 | Charles Chlustina | 30 | Head | Truck Driver | Illinois |
| 78 | Mabel Chlustina | 37 | Wife | Clerk Office | Illinois |
| 79 | Lawrence Johnson | 49 | Head | Teacher | Ohio |
| 80 | May Johnson | 44 | Wife | — | Illinois |
Pedigree Summary
William
Gen 1 · 2 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)