HP
Harold Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Harold Peterson across the 1910, 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Ida & Anton — first a son (b.~1905), then head of a 3-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 | Harold |
| 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 | Clerk |
| Industry | Public Utility Company |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1900 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Clerk |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harold | Age | Birth yr |
|---|---|---|---|---|
| Harold Peterson | Son | — | 35 | ~1905 |
| Marie Peterson | Spouse | — | 54 | ~1886 |
| Carl Peterson | Head | — | 57 | ~1883 |
Census Appearances
1910
Cook, Illinois
Son, age 4
Cook, Illinois · implied b. ~1906 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1920
Cook, Illinois
Son, age 13
Cook, Illinois · implied b. ~1907 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 24
Cook, Illinois · implied b. ~1906 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Harold J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| 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 — 3 household members
| Surname | Peterson |
| Given Name | Harold |
| 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 | Clerk |
| Industry | Public Utility Company |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1900 |
| 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 Harold Peterson across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Ida Peterson (~0.92 confidence) and father Anton Peterson (~0.92 confidence) and mother Ida Peterson (~0.92 confidence) and mother Anna Peterson (~0.92 confidence) and father Carl Peterson (~0.92 confidence) and mother Marie Peterson (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Ida Peterson
b. ~1863
Source mother
● Household
· direct · ~0.92
Father
Anton Peterson
b. ~1876
Source father
● Household
· direct · ~0.92
Mother
Ida Peterson
b. ~1879
Source mother
● Household
· direct · ~0.92
Mother
Anna Peterson
b. ~1880
Source mother
● Household
· direct · ~0.92
Father
Carl Peterson
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Marie Peterson
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Peterson
Son · 1940 · age 35 · b. ~1905 · 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-t0627-01015-00529)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Albert Skaff | 43 | Head | Salesman | Iowa |
| 2 | Margaret Skaff | 36 | Wife | Sewing Machine | So. Dakota |
| 3 | Martin Dahlstrom | 52 | Head | Clerk | Illinois |
| 4 | Anna Dahlstrom | 53 | Wife | — | Ohio |
| 5 | Kenneth Dahlstrom | 22 | Son | Clerk | Illinois |
| 6 | Edgar R. Miller | 63 | Head | Salesman | Indiana |
| 7 | Irene Miller | 60 | Wife | — | Indiana |
| 8 | Dennis O'Connor | 71 | Head | Rodman | Illinois |
| 9 | Nella O'Connor | 67 | Wife | — | Illinois |
| 10 | Carl E. Peterson | 57 | Head | Vest Trimmer | Sweden |
| 11 | Marie Peterson | 54 | Wife | — | Illinois |
| 12 | Harold Peterson THIS PERSON | 35 | Son | Clerk | Illinois |
| 13 | William S. Wilson | 61 | Head | Clerk | England |
| 14 | Catherine Wilson | 63 | Wife | — | England |
| 15 | Reginald W. Wilson | 38 | Son | Clerk | England |
| 16 | Joseph Pollice | 52 | Head | Dentist | Italy |
| 17 | Bertha Pollice | 48 | Wife | — | Illinois |
| 18 | George Pollice | 14 | Son | — | Illinois |
| 19 | Emmett Pollice | 12 | Son | — | Illinois |
| 20 | Gregory Pollice | 7 | Son | — | Illinois |
| 21 | Edward Wahl | 40 | Head | Chief Clerk | Illinois |
| 22 | Caroline Wahl | 38 | Wife | — | Illinois |
| 23 | Carolyn Wahl | 14 | Daughter | — | Illinois |
| 24 | Betty Wahl | 13 | Daughter | — | Illinois |
| 25 | John W. Johnson | 69 | Head | Press Feeder | Illinois |
| 26 | Harold J. Johnson | 29 | Son | Typesetter | Illinois |
| 27 | Magdalen Bermes | 45 | Head | Saleslady | Illinois |
| 28 | George Bermes | 19 | Son | Stenographer | Illinois |
| 29 | Benjamin Thomas | 52 | Head | Clerk | Missouri |
| 30 | Marie Thomas | 53 | Wife | Seamstress | Michigan |
| 31 | Alice Urban | 47 | Sister in law | — | Michigan |
| 32 | Celine Blair | 76 | Mother in law | — | Canada |
| 33 | George Jacobs | 46 | Head | Creditman | Illinois |
| 34 | Gertrude Jacobs | 43 | Wife | — | Illinois |
| 35 | George Jr. Jacobs | 19 | Son | Shipping Clerk | Illinois |
| 36 | Leonard Jacobs | 13 | Son | — | Illinois |
| 37 | Harry Mc Donald | 65 | Uncle | Elevator Operator | Canada |
| 38 | Fred J. Husser | 54 | Head | Janitor | Germany |
| 39 | Sallie Husser | 52 | Wife | — | Illinois |
| 40 | Lorraine Husser | 21 | Daughter | Clerk | Illinois |
Pedigree Summary
Harold
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)