HP
Harold Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Harrison-County, Iowa
Our Model Tree links this Harold Peterson across the 1920, 1930 and 1940 US Censuses in Harrison-County, Iowa (XGBoost, ~Confirmed), with identified parents William & William — first a head (b.~1917), then head of a 4-person household.
Age 23
b. ~1917
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Harrison-County, Iowa |
| Surname | Peterson |
| Given Name | Harold |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Morgan Township |
| 1935 Residence (County) | Harrison |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 387 |
| Highest Grade | H-4 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | Morgan Township |
| Est. Birth Year | ~1917 |
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 Harold | Age | Birth yr |
|---|---|---|---|---|
| Elaine Peterson | Daughter | — | 1 | ~1939 |
| Dagmar Peterson | Daughter | — | 3 | ~1937 |
| Harold Peterson | Head | — | 23 | ~1917 |
| Armada Peterson | Spouse | — | 21 | ~1919 |
Census Appearances
1920
Harrison, Iowa
Son, age 3
Harrison, Iowa · implied b. ~1917 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Petersen |
| Given Name | Harold A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Denmark |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Harrison, Iowa
Son, age 13
Harrison, Iowa · implied b. ~1917 — 7 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 | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Denmark |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Harrison-County, Iowa
Head, age 23
Harrison-County, Iowa · implied b. ~1917 — 4 household members
| Surname | Peterson |
| Given Name | Harold |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Morgan Township |
| 1935 Residence (County) | Harrison |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 387 |
| Highest Grade | H-4 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father William Peterson (~0.92 confidence) and father William Petersen (~0.92 confidence) and mother Hana Peterson (~0.92 confidence) and mother Johanna Petersen (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Peterson
b. ~1881
Source father
● Household
· direct · ~0.92
Father
William Petersen
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Hana Peterson
b. ~1889
Source mother
● Household
· direct · ~0.92
Mother
Johanna Petersen
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Peterson
Head · 1940 · age 23 · b. ~1917 · Iowa
★ 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 — Harrison-County, Iowa
Open full size
1940 US Federal Census — Harrison-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01166-00462)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edison Edwards | 18 | Son | Farm Hand | Iowa |
| 42 | Edwin Edwards | 16 | Son | — | Iowa |
| 43 | Kathryn Edwards | 14 | Daughter | — | Iowa |
| 44 | A. H. Haynie | 31 | Head | Farmer | Nebraska |
| 45 | Louise Haynie | 25 | Wife | — | Iowa |
| 46 | Betty Haynie | 5 | Daughter | — | Iowa |
| 47 | Lucille Haynie | 2 | Daughter | — | Iowa |
| 48 | Glen Caywood | 36 | Head | Farmer | Iowa |
| 49 | Helen Caywood | 30 | Wife | Waitress | Iowa |
| 50 | Habor Raffcorn | 40 | Head | Farmer | Iowa |
| 51 | Blanche Raffcorn | 38 | Wife | — | Iowa |
| 52 | Clark Raffcorn | 17 | Son | Farm Labor | Iowa |
| 53 | Robert Raffcorn | 14 | Son | Farm Labor | Iowa |
| 54 | Vaughn Cooper | 35 | Head | Farmer | Iowa |
| 55 | Helen Cooper | 29 | Wife | — | Iowa |
| 56 | Rejena Cooper | 3 | Daughter | — | Iowa |
| 57 | Darrell Hale | 18 | Hired Hand | Laborer | Iowa |
| 58 | Eldia Brown | 31 | Hired Hand | Masonry | Iowa |
| 59 | Wayne Cooper | 35 | Head | Laborer | Iowa |
| 60 | Opal Cooper | 31 | Wife | — | Missouri |
| 61 | Dwight Cooper | 6 | Son | — | Iowa |
| 62 | Dwain Cooper | 6 | Son | — | Iowa |
| 63 | Roger Cooper | 4 | Son | — | Iowa |
| 64 | Larry Cooper | 2 | Son | — | Iowa |
| 65 | Howard Young | 30 | Head | Farm Laborer | Iowa |
| 66 | Elsie Young | 28 | Wife | — | Iowa |
| 67 | Rita Young | 8 | Daughter | — | Iowa |
| 68 | David Young | 3 | Son | — | Iowa |
| 69 | Mary Ann Weldon | 92 | Head | — | Ohio |
| 70 | Harold Peterson THIS PERSON | 23 | Head | Farmer | Iowa |
| 71 | Armada Peterson | 21 | Wife | — | Iowa |
| 72 | Dagmar Peterson | 3 | Daughter | — | Iowa |
| 73 | Elaine Peterson | 1 | Daughter | — | Iowa |
| 74 | Curb Noyce | 52 | Head | Farmer | Iowa |
| 75 | Watson Kathryn Noyce | 35 | Keeper | House Work | Missouri |
| 76 | Merton Rathe | 31 | Head | Farmer | South Dakota |
| 77 | Linnie Rathe | 27 | Wife | — | Iowa |
| 78 | Joan Rathe | 4 | Daughter | — | Iowa |
| 79 | Jackson Rathe | 3 | Son | — | Iowa |
| 80 | Scott Rathe | 1 | Son | — | Iowa |
Pedigree Summary
Harold
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)