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William Harper — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Harper across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Edward & William — first a son (b.~1910), then head of a 5-person household.
Age 30
b. ~1910
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Harper |
| Given Name | William H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago - City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Draftsman |
| Industry | Plumbing Co |
| Class of Worker | PW |
| Hours Worked | 18 |
| Income (1939) | 162 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Draftsman |
| Township / Ward | Chicago City |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Mary Harper | Daughter | — | 25 | ~1915 |
| Hazel Harper | Daughter | — | 29 | ~1911 |
| Mary Harper | Head | — | 69 | ~1871 |
| Julia Harper | Other | — | 32 | ~1908 |
| William Harper | Son | — | 30 | ~1910 |
Census Appearances
1920
Cook, Illinois
Son, age 10
Cook, Illinois · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harper |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 20
Cook, Illinois · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harper |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Draftsman |
| Industry | Electrical Mfg. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 30
Cook-County, Illinois · implied b. ~1910 — 5 household members
| Surname | Harper |
| Given Name | William H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago - City |
| 1935 Residence (County) | Cook |
| Occupation | Draftsman |
| Industry | Plumbing Co |
| Class of Worker | PW |
| Hours Worked | 18 |
| Income (1939) | 162 |
| 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 Harper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Edward Harper (~0.92 confidence) and father William Harper (~0.92 confidence) and mother Mary Harper (~0.92 confidence) and mother Lillian Harper (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Edward Harper
b. ~1868
Source father
● Household
· direct · ~0.92
Father
William Harper
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Mary Harper
b. ~1871
Source mother
● Household
· direct · ~0.92
Mother
Lillian Harper
b. ~1883
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Harper
Son · 1940 · age 30 · b. ~1910 · Illinois
★ You are viewing this record
Sibling
Hazel Harper
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Harper
Sibling · 1940 · age 25
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 — 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-t0627-00951-00605)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Anton Rujacci | 44 | Head | Electrician | Illinois |
| 2 | Lydia Rujacci | 43 | Wife | — | Illinois |
| 3 | Anton Jr Rujacci | 16 | Son | — | Illinois |
| 4 | James Durslin | 40 | Head | Steamfitter | Illinois |
| 5 | Julia Durslin | 44 | Wife | — | Illinois |
| 6 | Helen E Durslin | 14 | Daughter | — | Illinois |
| 7 | Mary C Durslin | 12 | Daughter | — | Illinois |
| 8 | Rita M Durslin | 10 | Daughter | — | Illinois |
| 9 | Rose M Durslin | 10 | Daughter | — | Illinois |
| 10 | James J Jr Durslin | 7 | Son | — | Illinois |
| 11 | Anita T Durslin | 5 | Daughter | — | Illinois |
| 12 | John Huscava | 54 | Head | Gardner | Czechoslovakia |
| 13 | Theresa Huscava | 50 | Wife | — | Czechoslovakia |
| 14 | John Jr Huscava | 26 | Son | Shipping Clerk | Illinois |
| 15 | Eugenia Huscava | 19 | Daughter in Law | Laborer | Illinois |
| 16 | Marie Hand | 28 | Daughter | — | Illinois |
| 17 | Edward Hand | 33 | Son in Law | Manager | Illinois |
| 18 | Mary Harper | 69 | Head | — | Illinois |
| 19 | William H Harper THIS PERSON | 30 | Son | Draftsman | Illinois |
| 20 | Julia Harper | 32 | Daughter in Law | Assembler | Illinois |
| 21 | Hazel H Harper | 29 | Daughter | Tracer | Illinois |
| 22 | Mary G Harper | 25 | Daughter | File Clerk | Illinois |
| 23 | Archie H Cone | 44 | Head | Collector | Illinois |
| 24 | Evelyn E Cone | 35 | Wife | — | Illinois |
| 25 | Joseph J Billante | 37 | Head | Foreman | New York |
| 26 | Rose T Billante | 30 | Wife | — | Illinois |
| 27 | Dolores A Billante | 9 | Daughter | — | Illinois |
| 28 | Joseph L Jr Billante | 7 | Son | — | Illinois |
| 29 | Earl M Mcinerney | 35 | Head | Engineer | Illinois |
| 30 | Laura J Mcinerney | 34 | Wife | — | Illinois |
| 31 | William Mcinerney | 16 | Son | — | Illinois |
| 32 | Richard Mcinerney | 11 | Son | — | Illinois |
| 33 | Laurelee C Mcinerney | 3 | Daughter | — | Illinois |
| 34 | Henry Krejci | 52 | Head | Truck Driver | Czechoslovakia |
| 35 | Anna Krejci | 47 | Wife | — | Czechoslovakia |
| 36 | Henry Krejci | 20 | Son | — | Illinois |
| 37 | Rosario Rindone | 79 | Head | — | Italy |
| 38 | Petrina Rindone | 69 | Wife | — | Italy |
| 39 | Frances Rindone | 49 | Daughter | Seamstress | Italy |
| 40 | Vincent Lucchese | 41 | Son in Law | Barber | Italy |
Pedigree Summary
William + 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)