RN
Robert Nichols — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Robert Nichols across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Edward & Robert — first a son (b.~1909), then head of a 4-person household.
Age 31
b. ~1909
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Nichols |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Distributor |
| Industry | Soft Ball Park |
| Class of Worker | PW |
| Hours Worked | 22 |
| Income (1939) | 224 |
| Highest Grade | No 8 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Distributor |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1909 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Robert Nichols | Son | — | 31 | ~1909 |
| Margaret Nichols | Head | — | 51 | ~1889 |
| Margaret Bain | Daughter | — | 33 | ~1907 |
| Marie Nichols | Daughter | — | 16 | ~1924 |
Census Appearances
1920
Cook, Illinois
Son, age 10
Cook, Illinois · implied b. ~1910 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nichols |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 21
Cook, Illinois · implied b. ~1909 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nichols |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | South Dakota |
| Occupation | Electrician |
| Industry | Lamp Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 31
Cook-County, Illinois · implied b. ~1909 — 4 household members
| Surname | Nichols |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Distributor |
| Industry | Soft Ball Park |
| Class of Worker | PW |
| Hours Worked | 22 |
| Income (1939) | 224 |
| Highest Grade | No 8 |
| 1935 Residence | Illinois |
| 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 Robert Nichols across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Edward Nichols (~0.92 confidence) and father Robert Nichols (~0.92 confidence) and mother Margaret Nichols (~0.92 confidence) and mother Margaret Nichols (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Edward Nichols
b. ~1873
Source father
● Household
· direct · ~0.92
Father
Robert Nichols
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Margaret Nichols
b. ~1888
Source mother
● Household
· direct · ~0.92
Mother
Margaret Nichols
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Nichols
Son · 1940 · age 31 · b. ~1909 · Illinois
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Sibling
Marie Nichols
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Bain
Sibling · 1940 · age 33
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-t0627-00949-00101)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Daniel Mc Grath | 60 | Head | — | New York |
| 2 | Carl Johnson | 58 | Lodger | Carpenter | Sweden |
| 3 | Charles Anderson | 66 | Head | — | Sweden |
| 4 | Margaret Nichols | 51 | Head | Saleswoman | Illinois |
| 5 | Robert Nichols THIS PERSON | 31 | Son | Distributor | Illinois |
| 6 | Marie Nichols | 16 | Daughter | — | Illinois |
| 7 | Margaret Bain | 33 | Daughter | Switchboard Operator | Illinois |
| 8 | Frank Ballinger | 52 | Head | Fitter | Washington |
| 9 | John Candrian | 38 | Head | Fireman | Illinois |
| 10 | Lillian Candrian | 32 | Wife | — | Michigan |
| 11 | Rose Ann Candrian | 67 | Mother | — | Illinois |
| 12 | Alexander Fleming | 41 | Head | Janitor | England |
| 13 | Pearl Fleming | 51 | Wife | — | Illinois |
| 14 | Raymond Smith | 28 | Head | Mail Clerk | Illinois |
| 15 | George H. Smith | 22 | Son | Mail Carrier | Illinois |
| 16 | Elizabeth Smith | 19 | Son | Trucking | Illinois |
| 17 | Jean Smith | 16 | Daughter | — | Illinois |
| 18 | Pearl Smith | 14 | Daughter | — | Illinois |
| 19 | Marie Smith | 13 | Daughter | — | Illinois |
| 20 | Anna Smith | 11 | Daughter | — | Illinois |
| 21 | Robert Smith | 9 | Son | — | Illinois |
| 22 | Michael Rich | 45 | Head | Proprietor | Illinois |
| 23 | Gertrude Rich | 42 | Wife | — | Illinois |
| 24 | Josephine Rich | 22 | Daughter | Wrapper | Illinois |
| 25 | Conrad Rich | 19 | Son | New Worker | Illinois |
| 26 | Irene Rich | 11 | Daughter | — | Illinois |
| 27 | John Schmidt | 32 | Head | Mechanic Apprentice | Illinois |
| 28 | Fannie Schmidt | 30 | Wife | — | Illinois |
| 29 | Eleanor Schmidt | 10 | Daughter | — | Illinois |
| 30 | Martha Schmidt | 10 | Daughter | — | Illinois |
| 31 | John Schmidt | 9 | Son | — | Illinois |
| 32 | Robert Schmidt | 3 | Son | — | Illinois |
| 33 | Carolyn Schmidt | 53 | Mother | — | Hungary |
| 34 | Mary Zinsky | 62 | Head | — | Hungary |
| 35 | Mary Zinsky | 17 | Daughter | New Worker | Illinois |
| 36 | Michael Ankrowas | 61 | Head | Core Maker | Lithuania |
| 37 | Pauline Ankrowas | 58 | Wife | Sorter | Lithuania |
| 38 | Joseph Sheputis | 34 | Head | Trucker | Lithuania |
| 39 | Carl Zinsky | 26 | Head | Order Filler | Illinois |
| 40 | Aurelia Zinsky | 19 | Wife | — | Illinois |
Pedigree Summary
Robert + 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)