JF
John Frost — 1940 US Census Record
Model Tree available1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this John Frost across the 1920, 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed), with identified parents Matt & Katharine — first a head (b.~1905), then head of a 6-person household.
Age 35
b. ~1905
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Frost |
| Given Name | John M. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Blackhawk |
| Additional Details | |
| Occupation | WPA Foreman |
| Industry | Gov. Emergency |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 316 |
| Highest Grade | H-4 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Wpa Foreman |
| Township / Ward | Waterloo 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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Edward Frost | Son | — | 7 | ~1933 |
| Gloria Frost | Daughter | — | 2 | ~1938 |
| John Frost | Head | — | 35 | ~1905 |
| Patricia Frost | Daughter | — | 4 | ~1936 |
| F Frost | Spouse | — | 33 | ~1907 |
| Bessie Collier | Other | — | — |
Census Appearances
1920
Black Hawk, …
Son, age 15
Black Hawk, Iowa · implied b. ~1905 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frost |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Black Hawk, …
Son, age 25
Black Hawk, Iowa · implied b. ~1905 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frost |
| Given Name | John M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Iowa |
| Age at First Marriage | 25 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Germany |
| Occupation | Service Dept |
| Industry | Tractor Company |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Black-Hawk-County, Iowa
Head, age 35
Black-Hawk-County, Iowa · implied b. ~1905 — 6 household members
| Surname | Frost |
| Given Name | John M. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Blackhawk |
| Occupation | WPA Foreman |
| Industry | Gov. Emergency |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 316 |
| 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 John Frost across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Matt Frost (~0.92 confidence) and mother Katharine Frost (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Matt Frost
b. ~1859
Source father
● Household
· direct · ~0.92
Mother
Katharine Frost
b. ~1874
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Frost
Head · 1940 · age 35 · b. ~1905 · 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 — Black-Hawk-County, Iowa
Open full size
1940 US Federal Census — Black-Hawk-County, Iowa
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01140-00960)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Glenn C. Artfillisch | 25 | Son | Depart. | Iowa |
| 2 | Anna M. Goodlove | 52 | Head | Housekeeper | Ohio |
| 3 | Anna M. Stripe | 36 | Lodger | Housekeeper | Iowa |
| 4 | Clyde H. Johnson | 31 | Lodger | Insulator & Sprayer | Missouri |
| 5 | Burtis S. Purinton | 40 | Lodger | Roofer | Iowa |
| 6 | Herbert S. Cameron | 22 | Head | Laborer | Iowa |
| 7 | Frances V. Cameron | 21 | Wife | — | Iowa |
| 8 | Burle E. St. John | 57 | Head | Stone Cutter | Iowa |
| 9 | Catherine M. St. John | 56 | Wife | — | Iowa |
| 10 | Robert T. Olson | 25 | Lodger | Body & Fender Repair | Iowa |
| 11 | Leo J. Brooks | 45 | Head | Service Manager | Iowa |
| 12 | Genevia Brooks | 45 | Wife | — | Iowa |
| 13 | Verna Brooks | 23 | Daughter | Telephone Operator | Iowa |
| 14 | Leona Brooks | 21 | Daughter | Waitress | Iowa |
| 15 | Dale L. Brooks | 16 | Son | — | Iowa |
| 16 | James W. Brooks | 8 | Son | — | Iowa |
| 18 | Ida D. Nottger | 46 | Head | — | Iowa |
| 19 | Leroy L. Nottger | 20 | Son | Laborer | Iowa |
| 20 | Anna Hice | 65 | Head | — | Nebraska |
| 21 | Leona M. Hice | 44 | Daughter | Saleswoman | Iowa |
| 22 | Mabel R. Hice | 41 | Daughter | Secretary | Iowa |
| 23 | Barney J. Seroke | 37 | Lodger | Salesman | Illinois |
| 24 | Joe E. White | 25 | Lodger | Salesman | Iowa |
| 25 | John M. Frost THIS PERSON | 35 | Head | Wpa Foreman | Iowa |
| 26 | F. Katherine Frost | 33 | Wife | — | Minnesota |
| 27 | Edward Frost | 7 | Son | — | Iowa |
| 28 | Patricia Frost | 4 | Daughter | — | Iowa |
| 29 | Gloria Frost | 2 | Daughter | — | Iowa |
| 30 | Bessie M. Collier | None | Maid | House Maid | Iowa |
| 31 | James Magner | 76 | Head | — | Iowa |
| 32 | Anna Magner | 70 | Wife | — | Iowa |
| 33 | Walter F. Van Cleve | 25 | Head | Lathe Operator | Iowa |
| 34 | Loretta I. Van Cleve | 22 | Wife | — | Iowa |
| 35 | Mike Gentile | 66 | Head | Grocer | Italy |
| 36 | Rose Gentile | 59 | Wife | Saleswoman | Italy |
| 37 | "Rose J. ""C""" Gentile | 35 | Daughter | Saleswoman | Iowa |
| 38 | John C. Keegan | 46 | Head | Plumber | Iowa |
| 39 | Mayme A. Keegan | 50 | Sister | Saleslady | Iowa |
| 40 | Marguerite A. Keegan | 45 | Sister | Saleslady | Iowa |
Pedigree Summary
John
Gen 1 · 2 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)