JJ
John Johnston — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this John Johnston across the 1920, 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1871), then head of a 3-person household.
Age 69
b. ~1871
Male
Head
Born: Sweden
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Johnston |
| Given Name | John P. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 69 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Stationary Engineer |
| Industry | Hospital |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 540 |
| Highest Grade | No 1 |
| 1935 Residence | Same House |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
| Occupation | Stationary Engineer |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1871 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Johnston | Head | — | 69 | ~1871 |
| Donald Johnston | Son | — | 14 | ~1926 |
| Marie Johnston | Spouse | — | 54 | ~1886 |
Census Appearances
Head, age 49
Polk, Iowa · implied b. ~1871 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Joseph E |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Sweden |
| Year of Immigration | 1888 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Dist Supt |
| Industry | Social Church |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Swedish |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1930
Polk, Iowa
Head, age 60
Polk, Iowa · implied b. ~1870 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | John P |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Sweden |
| Naturalization Status | Naturalized |
| Year of Immigration | 1888 |
| Age at First Marriage | 44 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Stationary Fireman |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Swedish |
| Home Owned/Rented | O |
| Home Value / Rent | 3500 |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1940
Polk-County, Iowa
Head, age 69
Polk-County, Iowa · implied b. ~1871 — 3 household members
| Surname | Johnston |
| Given Name | John P. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 69 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Naturalization Status | Naturalized |
| Occupation | Stationary Engineer |
| Industry | Hospital |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 540 |
| Highest Grade | No 1 |
| 1935 Residence | Same House |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
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 Johnston across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Johnston
Head · 1940 · age 69 · b. ~1871 · 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 — Polk-County, Iowa
Open full size
1940 US Federal Census — Polk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01196-00505)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John P. Johnston THIS PERSON | 69 | Head | Stationary Engineer | Sweden |
| 2 | Marie Johnston | 54 | Wife | Finisher | Norway |
| 3 | Donald M. Johnston | 14 | Son | — | Iowa |
| 4 | Leonard S. Lind | 50 | Head | Receiving Clerk | Iowa |
| 5 | Alletta S. Lind | 54 | Wife | — | Norway |
| 6 | Jennie M. Lind | 21 | Daughter | New Worker | Iowa |
| 7 | Bernice M. Lind | 18 | Daughter | New Worker | Iowa |
| 8 | Leonard S. Lind | 12 | Son | — | Iowa |
| 9 | Earnest A. Ashdown | 60 | Head | Operator | Iowa |
| 10 | Mable V. Ashdown | 49 | Wife | Finisher | Iowa |
| 11 | Earnest A. Jr. Ashdown | 21 | Son | Messenger | Iowa |
| 12 | Wanda Lou Holtman | 13 | Niece | — | Iowa |
| 13 | Carl E. Kansche | 63 | Head | — | Iowa |
| 14 | Sada F. Kansche | 59 | Wife | — | Kansas |
| 15 | Vera E. Baker | 48 | Head | Cook | Iowa |
| 16 | Pearl D. Baker | 30 | Daughter | Book-Keeper | Iowa |
| 17 | Helen B. Baker | 18 | Daughter | Clerk | Iowa |
| 18 | Paul Olander | 46 | Head | Custodian | Iowa |
| 19 | Clara Olander | 46 | Wife | — | Iowa |
| 20 | Paul Jr. Olander | 17 | Son | — | Iowa |
| 21 | Margit Olander | 16 | Daughter | — | Iowa |
| 22 | Laurence Olander | 14 | Son | — | Iowa |
| 23 | Peter Anderson | 59 | Head | Pipe Layer | Sweden |
| 24 | Anna C. Anderson | 60 | Wife | — | Sweden |
| 25 | Adolf A. Anderson | 21 | Son | Underwriter Insurance | Iowa |
| 26 | Clara A. Anderson | 28 | Daughter | Nurse | Iowa |
| 27 | Claude V. Smith | 49 | Head | Painter | Iowa |
| 28 | Laura B. Smith | 71 | Mother | — | Illinois |
| 29 | Ernest F. Suwe | 51 | Head | Blacksmith | New York |
| 30 | Elizabeth E. Suwe | 52 | Wife | — | Iowa |
| 31 | Marion E. Suwe | 21 | Daughter | Label Operator | Iowa |
| 32 | William G. Cook | 77 | Head | — | Canada |
| 33 | Louis Vogetlin | 50 | Head | — | Iowa |
| 34 | Jack Vogetlin | 61 | Son | Laborer | Iowa |
| 35 | John Stimson | 65 | Lodger | — | Missouri |
| 36 | Mildred Dominique | 37 | Head | Seamstress | Missouri |
| 37 | Betty Dominique | 15 | Daughter | — | Iowa |
| 38 | Lelia Dominique | 11 | Daughter | — | Iowa |
| 39 | Clyde P. Cantrell | 30 | Head | Siding Applicator | South Dakota |
| 40 | Mary Cantrell | 30 | Wife | Waitress | Kansas |
Related Census Records
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)