EP
Elmer Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Elmer Peterson across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Emil & Anita — first a son (b.~1905), then head of a 4-person household.
Age 35
b. ~1905
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Peterson |
| Given Name | Elmer |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Attendant |
| Industry | Garage |
| Class of Worker | PW |
| Hours Worked | 72 |
| Income (1939) | 1116 |
| Highest Grade | H-2 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Attendant |
| Township / Ward | Chicago |
| Est. Birth Year | ~1905 |
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 Elmer | Age | Birth yr |
|---|---|---|---|---|
| Clarence Peterson | Son | — | 28 | ~1912 |
| Anita Peterson | Head | — | 65 | ~1875 |
| Elmer Peterson | Son | — | 35 | ~1905 |
| Alvin Peterson | Son | — | 32 | ~1908 |
Census Appearances
1920
Cook, Illinois
Son, age 15
Cook, Illinois · implied b. ~1905 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Elmer |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 25
Cook, Illinois · implied b. ~1905 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Elmer |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | helper |
| Industry | garage |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 35
Cook-County, Illinois · implied b. ~1905 — 4 household members
| Surname | Peterson |
| Given Name | Elmer |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Attendant |
| Industry | Garage |
| Class of Worker | PW |
| Hours Worked | 72 |
| Income (1939) | 1116 |
| Highest Grade | H-2 |
| 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 Elmer Peterson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Emil Peterson (~0.92 confidence) and mother Anita Peterson (~0.92 confidence) and mother Anna Peterson (~0.92 confidence) and mother Anna Peterson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Emil Peterson
b. ~1874
Source father
● Household
· direct · ~0.92
Mother
Anita Peterson
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Anna Peterson
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Anna Peterson
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Elmer Peterson
Son · 1940 · age 35 · b. ~1905 · Illinois
★ You are viewing this record
Sibling
Alvin Peterson
Sibling · 1940 · age 32
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clarence Peterson
Sibling · 1940 · age 28
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-t0627-01004-00776)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marion Johnson | 48 | Wife | — | Illinois |
| 2 | Virginia Johnson | 11 | Daughter | — | Illinois |
| 3 | June Carol Johnson | 6 | Daughter | — | Illinois |
| 4 | Hannah Johnson | 45 | Sister-in-law | — | Illinois |
| 5 | Thomas Crowley | 56 | Head | Bookkeeper | Illinois |
| 6 | Marion Crowley | 44 | Wife | — | Illinois |
| 7 | Kent Katherine Crowley | 66 | Mother-in-law | — | Germany |
| 8 | Anita Peterson | 65 | Head | — | Sweden |
| 9 | Elmer Peterson THIS PERSON | 35 | Son | Attendant | Illinois |
| 10 | Alvin Peterson | 32 | Son | Salesman | Illinois |
| 11 | Clarence Peterson | 28 | Son | Shipping Clerk | Illinois |
| 12 | Frederick Steiner | 56 | Head | Machinist | Illinois |
| 13 | Alma Steiner | 42 | Wife | — | Nebraska |
| 14 | Frederick Jr. Steiner | 9 | Son | — | Illinois |
| 15 | Marian Steiner | 3 | Daughter | — | Illinois |
| 16 | Hans Olaf Petersen | 55 | Head | Machinist | Denmark |
| 17 | Victoria Petersen | 50 | Wife | — | Illinois |
| 18 | Arthur Le Vant | 23 | Lodger | Operator | Illinois |
| 19 | Edward Plym | 29 | Head | Trimmer | Illinois |
| 20 | Catherine Plym | 27 | Wife | — | Illinois |
| 21 | Nova Plym | 1 | Daughter | — | Illinois |
| 22 | Walter Haguala | 42 | Head | Mechanic | Czecho-Slovakia |
| 23 | Lillian Haguala | 44 | Wife | Clerical | Illinois |
| 24 | Davidson Glen Haguala | 24 | Son | Bell Boy | Illinois |
| 25 | Joseph Stein | 32 | Head | Janitor | Jugoslavia |
| 26 | Catherine Stein | 30 | Wife | — | Jugoslavia |
| 27 | Mary Jean Stein | 1 | Daughter | — | Illinois |
| 28 | John Springer | 42 | Head | Proprietor | Germany |
| 29 | Marie Springer | 30 | Wife | — | Illinois |
| 30 | John Lee Springer | 1 | Son | — | Illinois |
| 31 | Oscar Plustin | 29 | Head | Salesman | Illinois |
| 32 | Esther Plustin | 27 | Wife | — | Illinois |
| 33 | Gerald Plustin | 4 | Son | — | Illinois |
| 34 | Rose Powell | 39 | Head | — | Illinois |
| 35 | Martin Powell | 17 | Son | Messenger | Illinois |
| 36 | Earl Vester | 26 | Head | Agent | Illinois |
| 37 | Virginia Vester | 24 | Wife | — | Illinois |
| 38 | Thomas Vester | 2 | Son | — | Illinois |
| 39 | John Matt | 23 | Head | Laborer | Illinois |
| 40 | Helen Matt | 25 | Wife | — | Michigan |
Pedigree Summary
Elmer + 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)