HP
Harold Peterson — 1930 US Census Record
Model Tree available1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Harold Peterson across the 1910, 1920 and 1930 US Censuses in Cook, Illinois (XGBoost, ~Confirmed), with identified parents John & Olive — first a son (b.~1905), then head of a 4-person household.
Age 25
b. ~1905
Male
Son
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Peterson |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Additional Details | |
| Occupation | Draftsman |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Draftsman |
| Township / Ward | Chicago City |
| 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 1930 census.
| Name | Relation to head | Relative to Harold | Age | Birth yr |
|---|---|---|---|---|
| Olivia Peterson | Spouse | — | 60 | ~1870 |
| Olaf Peterson | Head | — | 61 | ~1869 |
| Ethel Peterson | Daughter | — | 30 | ~1900 |
| Harold Peterson | Son | — | 25 | ~1905 |
Census Appearances
1910
Cook, Illinois
Son, age 4
Cook, Illinois · implied b. ~1906 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Petersen |
| 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 |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 | Harold |
| 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 — 4 household members
| Surname | Peterson |
| Given Name | Harold |
| 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 | Draftsman |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 3 US Census years (1910, 1920 and 1930) in Cook, Illinois, using XGBoost record linkage. Identified parents: father John Peterson (~0.92 confidence) and mother Olive Peterson (~0.92 confidence) and father Olaf Peterson (~0.92 confidence) and father Daniel Petersen (~0.92 confidence) and mother Carrie Petersen (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Peterson
b. ~1865
Source father
● Household
· direct · ~0.92
Mother
Olive Peterson
b. ~1866
Source mother
● Household
· direct · ~0.92
Father
Olaf Peterson
b. ~1869
Source father
● Household
· direct · ~0.92
Father
Daniel Petersen
b. ~1871
Source father
● Household
· direct · ~0.92
Mother
Carrie Petersen
b. ~1881
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Peterson
Son · 1930 · age 25 · b. ~1905 · Illinois
★ You are viewing this record
Sibling
Ethel Peterson
Sibling · 1930 · age 30
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
1930 US Federal Census — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel493ns:1042)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Florence Webb | 37 | Wife | Bookkeeper | Ohio |
| 2 | Joseph Spagat | 54 | Head | Caterer | Germany |
| 3 | Bridget Spagat | 52 | Wife | — | Pennsylvania |
| 4 | Florence Spagat | 24 | Daughter | Stenographer | Illinois |
| 5 | Pauline Spagat | 18 | Daughter | Assistant | Illinois |
| 6 | Anne Johnson | 36 | Head | Fitter | Wisconsin |
| 7 | Hedda Johnson | 64 | Mother | — | Sweden |
| 8 | Margaret B Cunningham | 57 | Head | — | Illinois |
| 9 | Ruth Cunningham | 25 | Daughter | Secretary | Washington |
| 10 | Irene Cunningham | 21 | Daughter | Stenographer | Idaho |
| 11 | Clara Cunningham | 12 | Daughter | — | Montana |
| 12 | John C Casady | 42 | Head | Trader | New York State |
| 13 | Mary E Casady | 42 | Wife | — | Connecticut |
| 14 | Lola Casady | 17 | Daughter | — | Illinois |
| 15 | John M Casady | 15 | Son | — | Ohio |
| 16 | Joyce Casady | 11 | Daughter | — | Michigan |
| 17 | Charles B Petty | 61 | Head | — | Illinois |
| 18 | Richard E Petty | 24 | Son | Credit Manager | Iowa |
| 19 | James F Roemer | 24 | Roomer | Salesman | Ireland |
| 20 | Henry J Knopf | 46 | Head | Dealer | Illinois |
| 21 | Edith M Knopf | 51 | Wife | — | India |
| 22 | Olaf Peterson | 61 | Head | Assembler | Sweden |
| 23 | Olivia Peterson | 60 | Wife | — | Sweden |
| 24 | Harold Peterson THIS PERSON | 25 | Son | Draftsman | Illinois |
| 25 | Ethel Peterson | 30 | Daughter | Social Work | New York |
| 26 | Louis Hayes | 45 | Head | — | Michigan |
| 27 | Crane Martin Hayes | 30 | Nephew | Lawyer | Illinois |
| 28 | Ruth Hayes | 26 | Niece | — | Illinois |
| 29 | Peter J Martin | 53 | Head | Superintendent | Illinois |
| 30 | Kathryn B Martin | 40 | Wife | — | Illinois |
| 31 | John F Martin | 16 | Son | — | Illinois |
| 32 | William A Martin | 14 | Son | — | Illinois |
| 33 | Kathryn M Martin | 11 | Daughter | — | Illinois |
| 34 | Joan M Martin | 9 | Daughter | — | Illinois |
| 35 | Oliver Chamberlin | 54 | Head | Printer | New York |
| 36 | E Louise Chamberlin | 54 | Wife | Teacher | Illinois |
| 37 | Oliver Jr Chamberlin | 12 | Son | — | Illinois |
| 38 | William Hay | 71 | Head | — | Canada |
| 39 | Frances R Hay | 62 | Wife | — | New York |
| 40 | Sarah E Dewey | 83 | Sister-in-law | — | New York |
| 41 | Olaf J Olson | 49 | Head | — | Sweden |
| 42 | Marie L Olson | 61 | Wife | — | Sweden |
| 43 | Conrad J Schoewe | 57 | Head | Proprietor | Germany |
| 44 | Louise Schoewe | 51 | Wife | — | Illinois |
| 45 | Emma Bokahoff | 55 | Sister-in-law | — | Illinois |
| 46 | Samuel S Fulmer | 56 | Head | Office Manager | Iowa |
| 47 | Henrietta Fulmer | 56 | Wife | — | Illinois |
| 48 | Leslie Scott | 37 | Head | Mechanic | Iowa |
| 49 | Blanche Scott | 37 | Wife | — | Iowa |
| 50 | Donald W Scott | 10 | Son | — | Michigan |
Related Census Records
Pedigree Summary
Harold + 1 sibling
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)