JP
John Pierson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Washington-County, Iowa
Our Model Tree links this John Pierson across the 1930 and 1940 US Censuses in Washington-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 5-person household.
Age 16
b. ~1924
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Washington-County, Iowa |
| Surname | Pierson |
| Given Name | John D |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | West Chester |
| 1935 Residence (County) | Washington |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H 2 |
| 1935 Residence | Same Place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | West Chester |
| Est. Birth Year | ~1924 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Sarah Pierson | Spouse | — | 45 | ~1895 |
| Willis Pierson | Son | — | 15 | ~1925 |
| Robert Pierson | Son | — | 17 | ~1923 |
| W Pierson | Head | — | 43 | ~1897 |
| John Pierson | Son | — | 16 | ~1924 |
Census Appearances
1930
Washington, Iowa
Son, age 6
Washington, Iowa · implied b. ~1924 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Pearson |
| Given Name | John D |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Washington-County, Iowa
Son, age 16
Washington-County, Iowa · implied b. ~1924 — 5 household members
| Surname | Pierson |
| Given Name | John D |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | West Chester |
| 1935 Residence (County) | Washington |
| Income (1939) | 0 |
| Highest Grade | H 2 |
| 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 John Pierson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Pierson
Son · 1940 · age 16 · b. ~1924 · Iowa
★ You are viewing this record
Sibling
Willis Pierson
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Pierson
Sibling · 1940 · age 17
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 — Washington-County, Iowa
Open full size
1940 US Federal Census — Washington-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01211-00180)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Beth C Reif | 17 | Daughter | — | Iowa |
| 42 | F Keith Mcclelland | 32 | Head | Salesman | Iowa |
| 43 | Nina N. V. Mcclelland | 22 | Wife | — | Iowa |
| 44 | Beverly-Ann Mcclelland | 2 | Daughter | — | Iowa |
| 45 | Carl E Walton | 70 | Head | Tiler | Iowa |
| 46 | Abiah Walton | 65 | Wife | — | Iowa |
| 47 | John W. Oldaker | 77 | Head | — | Iowa |
| 48 | Dora F Oldaker | 69 | Wife | — | Germany |
| 49 | Edmund H Testroet | 47 | Stepson | Laborer | Iowa |
| 50 | Carrie M Testroet | 41 | Stepdaug. | — | Iowa |
| 51 | Wayne E Testroet | 16 | S. Grand Son | — | Iowa |
| 52 | Albert T Augustine | 79 | Head | Buyer | Iowa |
| 53 | Miller Emma J Augustine | 75 | Housekeep | Housekeep | Iowa |
| 54 | Art L Rigenhagen | 36 | Head | Mechanic | Minn. |
| 55 | Appy E. Rigenhagen | 32 | Wife | Housekeeper | Iowa |
| 56 | Appy-May Rigenhagen | 12 | Daughter | — | Minn. |
| 57 | Arthur J Rigenhagen | 8 | Son | — | Iowa |
| 58 | Harold E Rigenhagen | 6 | Son | — | Iowa |
| 59 | Ada M Thomas | 23 | Roomer | Instructor | Illinois |
| 60 | Marietta Helgason | 33 | Roomer | Instructor | Iowa |
| 61 | Abbie Boyer | 65 | Head | — | Iowa |
| 62 | Agnes Ross | 70 | Head | — | Ireland |
| 63 | Matilda Parker | 95 | Sister | — | Ireland |
| 64 | Geo C Pennington | 36 | Head | Minister | Iowa |
| 65 | Minerva D Pennington | 31 | Wife | — | Iowa |
| 66 | Robert R Pennington | 9 | Son | — | Iowa |
| 67 | John E Pennington | 7 | Son | — | Iowa |
| 68 | Paul D Pennington | 1 | Son | — | Iowa |
| 69 | W Earl Pierson | 43 | Head | Truck Operator | Iowa |
| 70 | Sarah J Pierson | 45 | Wife | — | Iowa |
| 71 | Robert L Pierson | 17 | Son | — | Iowa |
| 72 | John D Pierson THIS PERSON | 16 | Son | — | Iowa |
| 73 | Willis G Pierson | 15 | Son | — | Iowa |
| 74 | James R Griggs | 62 | Head | Broker | Kentucky |
| 75 | Bertha M Griggs | 52 | Wife | — | Kentucky |
| 76 | Clide J Griggs | 19 | Son | Mechanic Helper | Iowa |
| 77 | J Harold Miller | 43 | Head | Proprietor | Missouri |
| 78 | Glena Miller | 43 | Wife | — | Iowa |
| 79 | Leila L Miller | 20 | Daughter | — | Kansas |
| 80 | C Ray Miller | 15 | Son | — | Iowa |
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)