AP
Alfred Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Monona-County, Iowa
Our Model Tree links this Alfred Peterson across the 1920, 1930 and 1940 US Censuses in Monona-County, Iowa (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1905), then head of a 4-person household.
Age 35
b. ~1905
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Monona-County, Iowa |
| Surname | Peterson |
| Given Name | Alfred L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | St. Clair Twp |
| 1935 Residence (County) | Monona |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | St Clair Twp |
| 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 Alfred | Age | Birth yr |
|---|---|---|---|---|
| Alfred Peterson | Son | — | 35 | ~1905 |
| John Peterson | Head | — | 69 | ~1871 |
| Minnie Peterson | Spouse | — | 55 | ~1885 |
| Herbert Peterson | Son | — | 31 | ~1909 |
Census Appearances
1920
Monona, Iowa
Son, age 14
Monona, Iowa · implied b. ~1906 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Alfred |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Monona, Iowa
Son, age 24
Monona, Iowa · implied b. ~1906 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Petersen |
| Given Name | Alfred |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Farm Laborer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Monona-County, Iowa
Son, age 35
Monona-County, Iowa · implied b. ~1905 — 4 household members
| Surname | Peterson |
| Given Name | Alfred L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | St. Clair Twp |
| 1935 Residence (County) | Monona |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 Alfred Peterson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Peterson (~0.92 confidence) and father John Petersen (~0.92 confidence) and mother Minna Petersen (~0.92 confidence) and mother Minnie Peterson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Peterson
b. ~1871
Source father
● Household
· direct · ~0.92
Father
John Petersen
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Minna Petersen
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Minnie Peterson
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Alfred Peterson
Son · 1940 · age 35 · b. ~1905 · Iowa
★ You are viewing this record
Sibling
Herbert Peterson
Sibling · 1940 · age 31
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 — Monona-County, Iowa
Open full size
1940 US Federal Census — Monona-County, Iowa
Page Contents
34 people indexed on this census page (nara:1940:m-t0627-01184-00437)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John Madison | 60 | Head | Farmer | Denmark |
| 42 | Caroline Madison | 56 | Wife | — | Denmark |
| 43 | Margaret Fritz | 20 | Hired girl | Servant | Iowa |
| 44 | Carl Swanson | 60 | Head | Farmer | Sweden |
| 45 | Minnie Swanson | 60 | Wife | — | Denmark |
| 46 | Harry Auld | 44 | Hired hand | Farmhand | Iowa |
| 47 | Nels Berg | 56 | Head | Farmer | Iowa |
| 48 | Della Berg | 43 | Wife | — | Iowa |
| 49 | Edna M. Berg | 17 | Daughter | — | Iowa |
| 50 | Fred Soukup | 30 | Head | Farmer | Missouri |
| 51 | Ella Soukup | 29 | Wife | — | Iowa |
| 52 | Gene E. Soukup | 3 | Son | — | Iowa |
| 53 | John Peterson | 69 | Head | Farmer | Germany |
| 54 | Minnie A. Peterson | 55 | Wife | — | Denmark |
| 55 | Alfred L. Peterson THIS PERSON | 35 | Son | — | Iowa |
| 56 | Herbert H. Peterson | 31 | Son | Farmhand | Iowa |
| 57 | Raymond Pithan | 31 | Head | Farmer | Iowa |
| 58 | Marjorie Pithan | 27 | Wife | — | Iowa |
| 59 | Frankie M. Pithan | 2 | Daughter | — | Iowa |
| 60 | Robert R. Pithan | 1 | Son | — | Iowa |
| 61 | Leonard Stephenson | 36 | Head | Farmer | Iowa |
| 62 | Mabel Stephenson | 37 | Wife | — | Iowa |
| 63 | Leonard E. Stephenson | 13 | Son | — | Iowa |
| 64 | Wayne A. Stephenson | 11 | Son | — | Iowa |
| 65 | Marcial C. Stephenson | 2 | Daughter | — | Iowa |
| 66 | Dow Strait | 43 | Head | Farmer | Iowa |
| 67 | Anna Strait | 37 | Wife | — | Iowa |
| 68 | Laurence D. Strait | 18 | Son | Farmhand | Iowa |
| 69 | Muriel J. Strait | 16 | Daughter | — | Iowa |
| 70 | Mary Ann Strait | 1 | Daughter | — | Iowa |
| 71 | John Daby | 52 | Head | Farmer | Iowa |
| 72 | Chris Daby | 82 | Father | — | Denmark |
| 73 | Edith Nelson | 27 | Hired girl | Servant | Iowa |
| 74 | Thomas Hangel | 59 | Hired hand | Farmhand | Illinois |
Related Census Records
Pedigree Summary
Alfred + 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)