JT
John Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this John Thomas across the 1920, 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1914), then head of a 8-person household.
Age 26
b. ~1914
Male
Son
Born: Nebraska
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Thomas |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Nebraska |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Occupation | Interior Decorator |
| Industry | Private Homes |
| Class of Worker | PW |
| Hours Worked | 14 |
| Income (1939) | 0 |
| Highest Grade | No H2 |
| 1935 Residence | Same place |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
| Occupation | Interior Decorator |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1914 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Linda Thomas | Daughter | — | 2 | ~1938 |
| Ruth Thomas | Daughter | — | 18 | ~1922 |
| Janet Thomas | Daughter | — | 4 | ~1936 |
| John Thomas | Head | — | 71 | ~1869 |
| Virginia Thomas | Other | — | 23 | ~1917 |
| Judith Thomas | Other | — | 1 | ~1939 |
| John Thomas | Son | — | 26 | ~1914 |
| Maude Thomas | Spouse | — | 58 | ~1882 |
Census Appearances
1920
Polk, Iowa
Son, age 6
Polk, Iowa · implied b. ~1914 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Nebraska |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Kansas |
| Speaks English | Yes |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
1930
Polk, Iowa
Son, age 16
Polk, Iowa · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Nebraska |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Kansas |
| Can Read/Write | Yes |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
1940
Polk-County, Iowa
Son, age 26
Polk-County, Iowa · implied b. ~1914 — 8 household members
| Surname | Thomas |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Nebraska |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Occupation | Interior Decorator |
| Industry | Private Homes |
| Class of Worker | PW |
| Hours Worked | 14 |
| Income (1939) | 0 |
| Highest Grade | No H2 |
| 1935 Residence | Same place |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
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 Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Thomas (~0.92 confidence) and father John Thomas (~0.92 confidence) and father John Thomas (~0.92 confidence) and mother Maude Thomas (~0.92 confidence) and mother Maud Thomas (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Thomas
b. ~1869
Source father
● Household
· direct · ~0.92
Father
John Thomas
b. ~1869
Source father
● Household
· direct · ~0.92
Father
John Thomas
b. ~1869
Source father
● Household
· direct · ~0.92
Mother
Maude Thomas
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Maud Thomas
b. ~1881
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Thomas
Son · 1940 · age 26 · b. ~1914 · Iowa
★ You are viewing this record
Sibling
Linda Thomas
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Janet Thomas
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Thomas
Sibling · 1940 · age 18
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 — 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-t0627-01197-00248)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Beulah F. Michael | 36 | Head | H | Iowa |
| 2 | Dale R. Michael | 13 | Son | — | Iowa |
| 3 | Charles V. Michael | 10 | Son | — | Iowa |
| 4 | Valda J. Michael | 9 | Daughter | — | Iowa |
| 5 | Billy L. Michael | 8 | Son | — | Iowa |
| 6 | Kathaleen R. Michael | 4 | Daughter | — | Iowa |
| 7 | Leo G. Michael | 12 | Son | — | Iowa |
| 8 | Eve P. Anderson | 66 | Mother-in-law | H | Iowa |
| 9 | Ivan L. Crawford | 39 | Head | Night Watchman | Iowa |
| 10 | Helen J. Crawford | 34 | Wife | H | Iowa |
| 11 | Robert B. Crawford | 17 | Son | S | Iowa |
| 12 | Betty M. Crawford | 15 | Daughter | S | Iowa |
| 13 | Meloris E. Crawford | 14 | Daughter | S | Iowa |
| 14 | Joan Crawford | 8 | Daughter | — | Iowa |
| 15 | Carl H. Mccoy | 45 | Head | Truck Driver | Iowa |
| 16 | Bessie H. Mccoy | 35 | Wife | H | Iowa |
| 17 | Charleen J. Mccoy | 10 | Daughter | — | Nebraska |
| 18 | Marion J. Mccoy | 3 | Daughter | — | Iowa |
| 19 | Harris E. Gunder | 36 | Head | Bartender | Missouri |
| 20 | Shirley M. Gunder | 30 | Wife | H | Missouri |
| 21 | Nellie M. Gunder | 7 | Daughter | — | Missouri |
| 22 | Robert E. Gunder | 5 | Son | — | Missouri |
| 23 | Mary H. Gunder | 2 | Daughter | — | Iowa |
| 24 | Harry E. Sowder | 35 | Head | V | Iowa |
| 25 | Cloie H. Sowder | 32 | Wife | Teaches Sewing | New Mexico |
| 26 | Meloris M. Sowder | 9 | Daughter | — | Iowa |
| 27 | Hale M. Sowder | 5 | Son | — | Iowa |
| 28 | — | None | — | — | — |
| 29 | Eva M. Smith | 59 | Head | H | Iowa |
| 30 | J. W. Ladle | 68 | Lodger | V | Iowa |
| 31 | John J. Thomas | 71 | Head | Night Watchman | Missouri |
| 32 | Maude T. Thomas | 58 | Wife | H | Kansas |
| 33 | Ruth E. Thomas | 18 | Daughter | 3 | Iowa |
| 34 | John S. Thomas THIS PERSON | 26 | Son | Interior Decorator | Nebraska |
| 35 | Virginia R. Thomas | 23 | Daughter-in-law | Maid | Iowa |
| 36 | Janet L. Thomas | 4 | Daughter | — | Iowa |
| 37 | Linda L. Thomas | 2 | Daughter | — | Iowa |
| 38 | Judith L. Thomas | 1 | Granddaughter | — | Iowa |
| 39 | Martha Plummer | 87 | Head | V | Illinois |
| 40 | Jesse L. Henderson | 64 | Daughter | H | Illinois |
Pedigree Summary
John + 3 siblings
Gen 1 · 5 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)