HP
Harold Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Isanti-County, Minnesota
Our Model Tree links this Harold Peterson across the 1920, 1930 and 1940 US Censuses in Isanti-County, Minnesota (XGBoost, ~Confirmed), with identified parents Roy & Alma — first a son (b.~1919), then head of a 4-person household.
Age 21
b. ~1919
Male
Son
Born: Minnesota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Isanti-County, Minnesota |
| Surname | Peterson |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | Spencer Brook |
| 1935 Residence (County) | Isanti |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 66 |
| Income (1939) | 452 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
| Occupation | Farmer |
| Township / Ward | Spencer Brook |
| Est. Birth Year | ~1919 |
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 |
|---|---|---|---|---|
| Alma Peterson | Spouse | — | 47 | ~1893 |
| Harold Peterson | Son | — | 21 | ~1919 |
| Donald Peterson | Son | — | 19 | ~1921 |
| Ross Peterson | Head | — | 44 | ~1896 |
Census Appearances
1920
Isanti, Minnesota
Other, age 1
Isanti, Minnesota · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Harold |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Minnesota |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1930
Isanti, Minnesota
Son, age 11
Isanti, Minnesota · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Herald |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Minnesota |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1940
Isanti-County, Minnesota
Son, age 21
Isanti-County, Minnesota · implied b. ~1919 — 4 household members
| Surname | Peterson |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | Spencer Brook |
| 1935 Residence (County) | Isanti |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 66 |
| Income (1939) | 452 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
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 Roy Peterson (~0.92 confidence) and mother Alma Peterson (~0.92 confidence) and mother Alma Peterson (~0.92 confidence) and father Ross Peterson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Roy Peterson
b. ~1892
Source father
● Household
· direct · ~0.92
Mother
Alma Peterson
b. ~1893
Source mother
● Household
· direct · ~0.92
Mother
Alma Peterson
b. ~1893
Source mother
● Household
· direct · ~0.92
Father
Ross Peterson
b. ~1896
Source father
● Household
· direct · ~0.92
This person
Anchor record
Harold Peterson
Son · 1940 · age 21 · b. ~1919 · Minnesota
★ You are viewing this record
Sibling
Donald Peterson
Sibling · 1940 · age 19
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 — Isanti-County, Minnesota
Open full size
1940 US Federal Census — Isanti-County, Minnesota
Page Contents
16 people indexed on this census page (nara:1940:m-t0627-01927-01124)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Habis | 34 | Head | Farmer | Pennsylvania |
| 2 | John D. Reynolds | 61 | Head | Farmer | Minnesota |
| 3 | Hilma Reynolds | 62 | Wife | — | Sweden |
| 4 | George Reynolds | 32 | Son | Farm Laborer | Minnesota |
| 5 | Ross Peterson | 44 | Head | Farmer | Minnesota |
| 6 | Alma Peterson | 47 | Wife | — | Minnesota |
| 7 | Harold Peterson THIS PERSON | 21 | Son | Farmer | Minnesota |
| 8 | Donald Peterson | 19 | Son | Farm Laborer | Minnesota |
| 9 | Emil Grams | 51 | Head | Laborer | Minnesota |
| 10 | Amelia Grams | 37 | Wife | — | Iowa |
| 11 | Gladys Grams | 16 | Daughter | — | Minnesota |
| 12 | Lucille Grams | 13 | Daughter | — | Minnesota |
| 13 | Raymond Grams | 12 | Son | — | Minnesota |
| 14 | Simpi Hesso | 41 | Boarder | Teacher | Michigan |
| 15 | R. B. Severance | 75 | Head | — | New Hampshire |
| 16 | Anthony Mekin | 60 | Head | Farmer | Minnesota |
Pedigree Summary
Harold + 1 sibling
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)