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Clarence Nelson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Clarence Nelson across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Ellen & John — first a son (b.~1914), then head of a 4-person household.
Age 26
b. ~1914
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Nelson |
| Given Name | Clarence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Accountant |
| Industry | Wallboard Manuf |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1752 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Accountant |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1914 |
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 Clarence | Age | Birth yr |
|---|---|---|---|---|
| Nancy Nelson | Daughter | — | 24 | ~1916 |
| John Nelson | Head | — | 65 | ~1875 |
| Clarence Nelson | Son | — | 26 | ~1914 |
| Ellen Nelson | Spouse | — | 67 | ~1873 |
Census Appearances
1920
Cook, Illinois
Son, age 7
Cook, Illinois · implied b. ~1913 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Clarence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 17
Cook, Illinois · implied b. ~1913 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Clarence Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Illinois |
| Occupation | Stock helper |
| Industry | 5 & 10 cent store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 26
Cook-County, Illinois · implied b. ~1914 — 4 household members
| Surname | Nelson |
| Given Name | Clarence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Accountant |
| Industry | Wallboard Manuf |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1752 |
| Highest Grade | Hs 4 |
| 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 Clarence Nelson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Ellen Nelson (~0.92 confidence) and father John Nelson (~0.92 confidence) and mother Ellen Nelson (~0.92 confidence) and father Clarence Nelson (~0.92 confidence) and mother Esther Nelson (~0.92 confidence) and father George Nelson (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Ellen Nelson
b. ~1873
Source mother
● Household
· direct · ~0.92
Father
John Nelson
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Ellen Nelson
b. ~1889
Source mother
● Household
· direct · ~0.92
Father
Clarence Nelson
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Esther Nelson
b. ~1890
Source mother
● Household
· direct · ~0.92
Father
George Nelson
b. ~1890
Source father
● Household
· direct · ~0.92
This person
Anchor record
Clarence Nelson
Son · 1940 · age 26 · b. ~1914 · Illinois
★ You are viewing this record
Sibling
Nancy Nelson
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00990-00785)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mildred Neumann | 23 | Daughter | Secretary | Illinois |
| 42 | John A Kapp | 65 | Head | Printer | Illinois |
| 43 | Ida V Kapp | 64 | Wife | — | Illinois |
| 44 | Mildred E Puffett | 42 | Daughter | Teaching | Illinois |
| 45 | Patricia Puffett | 13 | Grandchild | — | Illinois |
| 46 | Jerrell Puffett | 5 | Grandchild | — | Kansas |
| 47 | Sheila Puffett | 2 | Grandchild | — | Illinois |
| 48 | Samuel R Sorensen | 52 | Head | Electric Work | — |
| 49 | Josephine Sorensen | 46 | Wife | — | Wisconsin |
| 50 | William Sorensen | 20 | Son | Chauffeur | Illinois |
| 51 | Margaret Sorensen | 18 | Daughter | Salesperson | Illinois |
| 52 | John Sorensen | 13 | Son | — | Illinois |
| 53 | Anna Euler | 57 | Sister-in-law | Housekeeper | Wisconsin |
| 54 | Oscar Strom | 34 | Head | Laborer | Norway |
| 55 | Marie Strom | 40 | Wife | — | Wisconsin |
| 56 | Arthur Nordbye | 44 | Head | Operator Switch Board | Illinois |
| 57 | Geraldine Nordbye | 16 | Daughter | — | Illinois |
| 58 | Warren Nordbye | 7 | Son | — | Illinois |
| 59 | John Nelson | 65 | Head | Mechanic | Sweden |
| 60 | Ellen Nelson | 67 | Wife | — | Illinois |
| 61 | Clarence Nelson THIS PERSON | 26 | Son | Accountant | Illinois |
| 62 | Nancy Nelson | 24 | Daughter | Bookkeeper | Illinois |
| 64 | William Ewing | 32 | Head | Salesman | Illinois |
| 65 | Ruth Ewing | 31 | Wife | — | Illinois |
| 66 | Loisine Ewing | 5 | Daughter | — | Illinois |
| 67 | John Larson | 74 | Father-in-law | Janitor | Sweden |
| 68 | Louisa Larson | 69 | Mother-in-law | — | Sweden |
| 69 | George Ratajczak | 31 | Head | Chauffeur | Michigan |
| 70 | Lottie Ratajczak | 27 | Wife | — | Illinois |
| 71 | Raymond Ratajczak | 4 | Son | — | Illinois |
| 72 | John Kullovitch | 40 | Head | Carpenter | Austria |
| 73 | Margaret Kullovitch | 32 | Wife | — | Romania |
| 74 | George Kullovitch | 9 | Son | — | Illinois |
| 75 | Mary Kullovitch | 7 | Daughter | — | Illinois |
| 76 | Catherine Kullovitch | 2 | Daughter | — | Illinois |
| 77 | Fred E Moore | 47 | Head | Stationary Engineer | Illinois |
| 78 | Grace Moore | 40 | Wife | — | Illinois |
| 79 | Ruby Moore | 17 | Daughter | — | Illinois |
| 80 | Albert Klages | 58 | Head | Copying Documents | Illinois |
Pedigree Summary
Clarence + 1 sibling
Gen 1 · 6 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)