FJ
Frederick Johnson — 1930 US Census Record
Model Tree available1930 United States Federal Census · Calhoun, Iowa
Our Model Tree links this Frederick Johnson across the 1910, 1920 and 1930 US Censuses in Calhoun, Iowa (XGBoost, ~Confirmed), with identified parents John & Paul — first a son (b.~1908), then head of a 9-person household.
Age 22
b. ~1908
Male
Son
Born: Iowa
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Calhoun, Iowa |
| Surname | Johnson |
| Given Name | Frederick |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Germany |
| Additional Details | |
| Occupation | Laborer |
| Industry | Odd Jobs |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Laborer |
| Township / Ward | Pomeroy Town Part Of |
| Est. Birth Year | ~1908 |
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.
9 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Frederick | Age | Birth yr |
|---|---|---|---|---|
| Nelson Olaf | Other | — | 48 | ~1882 |
| Minnie Johnson | Other | — | 55 | ~1875 |
| John Johnson | Head | — | 63 | ~1867 |
| Benjamin Brethauer | Son | — | 27 | ~1903 |
| Hugo Swalin | Other | — | 26 | ~1904 |
| Frederick Johnson | Son | — | 22 | ~1908 |
| William Johnson | Other | — | 23 | ~1907 |
| Olson Nels | Other | — | 50 | ~1880 |
| Florence O'Boyle | Other | — | 64 | ~1866 |
Census Appearances
1910
Calhoun, Iowa
Son, age 2
Calhoun, Iowa · implied b. ~1908 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Frederick |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Germany |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1920
Calhoun, Iowa
Son, age 11
Calhoun, Iowa · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Frederick |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Germany |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Calhoun, Iowa
Son, age 22
Calhoun, Iowa · implied b. ~1908 — 9 household members
| Surname | Johnson |
| Given Name | Frederick |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Germany |
| Occupation | Laborer |
| Industry | Odd Jobs |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 Frederick Johnson across 3 US Census years (1910, 1920 and 1930) in Calhoun, Iowa, using XGBoost record linkage. Identified parents: father John Johnson (~0.92 confidence) and father Paul Johnson (~0.92 confidence) and mother Minnie Johnson (~0.92 confidence) and father John Johnson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Johnson
b. ~1867
Source father
● Household
· direct · ~0.92
Father
Paul Johnson
b. ~1867
Source father
● Household
· direct · ~0.92
Mother
Minnie Johnson
b. ~1874
Source mother
● Household
· direct · ~0.92
Father
John Johnson
b. ~1877
Source father
● Household
· direct · ~0.92
This person
Anchor record
Frederick Johnson
Son · 1930 · age 22 · b. ~1908 · Iowa
★ You are viewing this record
Sibling
Benjamin Brethauer
Sibling · 1930 · age 27
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 — Calhoun, Iowa
Open full size
1930 US Federal Census — Calhoun, Iowa
Page Contents
42 people indexed on this census page (ia:1930:iowacensus00reel645:0817)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Narcissa Mullen | 70 | Wife-H | — | Illinois |
| 52 | Roland Roese | 28 | Head | Painter | Iowa |
| 53 | Minnie Roese | 24 | Wife-H | Waitress | Iowa |
| 54 | Herman J. Voss | 45 | Head | Lab. Laborer | New York |
| 55 | Mary Agburn | 62 | Head | — | Iowa |
| 56 | George Sigler | 43 | Head | Laborer | Iowa |
| 57 | Cora Sigler | 32 | Wife-H | — | New York |
| 58 | Floyd Sigler | 15 | Son | Helper | Iowa |
| 59 | Nora Sigler | 12 | Daughter | — | Iowa |
| 60 | Virgil Sigler | 11 | Son | — | Iowa |
| 61 | Priscilla Sigler | 69 | Roomer | — | Iowa |
| 62 | Mary K. Sisco | 71 | Head-H | — | Wisconsin |
| 63 | Mary Folkerts | 60 | Head-H | — | Germany |
| 64 | Peter J. De Volder | 35 | Head | Electrician | Belgium |
| 65 | Marie De Volder | 31 | Wife-H | — | Wisconsin |
| 66 | John De Volder | 5 | Son | — | Iowa |
| 67 | Paul De Volder | 5 | Son | — | Iowa |
| 68 | Rosalie De Volder | 2 | Daughter | — | Iowa |
| 69 | James De Volder | 0 | Son | — | Iowa |
| 70 | Paul Haneclaus | 58 | Head | Watchmaker | Germany |
| 71 | John Buden | 27 | Son | Barber | Iowa |
| 72 | Emma Buden | 20 | Daughter | — | Iowa |
| 73 | Henry Buden | 13 | Son | — | Iowa |
| 74 | Faynell M. Bradley | 23 | Roomer | Teacher | Iowa |
| 75 | George Roese | 48 | Son | Carpenter | Illinois |
| 76 | Gordon Crang | 20 | Son | — | Iowa |
| 77 | Mary Osborne | 60 | Head | — | Iowa |
| 78 | Richard Frerichs | 44 | Head-H | Laborer | Germany |
| 79 | Peter Antons | 61 | Head-H | — | Germany |
| 80 | John A. Johnson | 63 | Head | Rural Carrier | Sweden |
| 81 | Minnie Johnson | 55 | Wife-H | — | Germany |
| 82 | William Johnson | 23 | Son-At | — | Iowa |
| 83 | Frederick Johnson THIS PERSON | 22 | Son | Laborer | Iowa |
| 84 | Florence O'Boyle | 64 | — | — | Iowa |
| 85 | Nelson Olaf | 48 | Roomer | Laborer | Iowa |
| 86 | Olson Nels | 50 | Roomer | Carpenter | Iowa |
| 87 | Hugo Swalin | 26 | Roomer | Assistant Cashier | Iowa |
| 88 | Benjamin Brethauer | 27 | Son | Doctor | Iowa |
| 89 | John Peterson | 63 | Head | — | Sweden |
| 90 | Inge Peterson | 60 | Wife-H | — | Sweden |
| 91 | Edward Doyle | 33 | Son | Laborer | Iowa |
| 92 | Anne Doyle | 24 | Daughter-in-law | — | Minnesota |
Pedigree Summary
Frederick + 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 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)