RT
Ralph Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this Ralph Thomas across the 1920, 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed), with identified parents John & Luke — first a head (b.~1908), then head of a 3-person household.
Age 32
b. ~1908
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Thomas |
| Given Name | Ralph |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Occupation | Salesman |
| Industry | Bread Co |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 2050 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Salesman |
| Township / Ward | Des Moines City |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Ralph | Age | Birth yr |
|---|---|---|---|---|
| Ralph Thomas | Son | — | 3 | ~1937 |
| Ralph Thomas | Head | — | 32 | ~1908 |
| Mabel Thomas | Spouse | — | 26 | ~1914 |
Census Appearances
1920
Polk, Iowa
Son, age 11
Polk, Iowa · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Ralph |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Polk, Iowa
Son, age 21
Polk, Iowa · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Miner |
| Industry | Mining |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Head, age 32
Polk-County, Iowa · implied b. ~1908 — 3 household members
| Surname | Thomas |
| Given Name | Ralph |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Occupation | Salesman |
| Industry | Bread Co |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 2050 |
| Highest Grade | H-4 |
| 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 Ralph 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 Luke Thomas (~0.92 confidence) and mother Elisabeth Thomas (~0.92 confidence) and mother Elizabeth Thomas (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Thomas
b. ~1880
Source father
● Household
· direct · ~0.92
Father
Luke Thomas
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Elisabeth Thomas
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Elizabeth Thomas
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Ralph Thomas
Head · 1940 · age 32 · b. ~1908 · 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
39 people indexed on this census page (nara:1940:m-t0627-01195-00614)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Byron Thomas | 37 | Head | Trucker | Iowa |
| 42 | Catherine Thomas | 35 | Wife | — | Iowa |
| 43 | James Wm Thomas | 14 | Son | — | Iowa |
| 44 | Dora Thomas | 10 | Daughter | — | Iowa |
| 45 | Ruth Thomas | 7 | Daughter | — | Iowa |
| 46 | Norma Jean Thomas | 5 | Daughter | — | Iowa |
| 48 | Willie Henderson | 38 | Head | Auto Mech | Ill. |
| 49 | Amanda Henderson | 35 | Wife | — | Iowa |
| 50 | Erma Henderson | 12 | Daughter | — | Iowa |
| 51 | Jennie Lou Henderson | 7 | Daughter | — | Iowa |
| 52 | Ned Likes | 62 | Head | — | Iowa |
| 53 | Amanda Likes | 92 | Mother | — | Ind. |
| 54 | Glenn Likes | 26 | Nephew | Builders Helper | Iowa |
| 55 | Grace Likes | 23 | Niece | — | Mo. |
| 56 | Geo Manuel | 24 | Head | Porter | Iowa |
| 57 | Lessie Manuel | 21 | Wife | Housework | Iowa |
| 58 | Geo Brown | 72 | G. Father | — | Mo. |
| 59 | Lydia Brown | 72 | G. Mother | — | Mo. |
| 60 | Ralph Thomas THIS PERSON | 32 | Head | Salesman | Iowa |
| 61 | Mabel Thomas | 26 | Wife | — | Iowa |
| 62 | Ralph Thomas | 3 | Son | — | Iowa |
| 63 | Les Richardson | 32 | Head | Janitor | Iowa |
| 64 | Opal Richardson | 31 | Wife | Janitress | Wisc. |
| 65 | Frank Hurley | 38 | Head | — | Iowa |
| 66 | Minnie Hurley | 36 | Wife | Laborer | Iowa |
| 67 | Susie Hensley | 63 | Head | — | Kent. |
| 68 | Geo Murphy | 84 | Head | — | Ill. |
| 69 | Lyman Pharo | 42 | Head | Foreman | Iowa |
| 70 | Myrtle Pharo | 46 | Wife | — | Iowa |
| 71 | Ralph Stevens | 44 | Head | Foreman | Ind. |
| 72 | Blanche Stevens | 38 | Wife | — | Iowa |
| 73 | Gloria Stevens | 14 | Daughter | — | Iowa |
| 74 | Mary Alice Stevens | 3 | Daughter | — | Iowa |
| 75 | Ed Smith | 66 | Head | Truck Driver | Iowa |
| 76 | Mary Smith | 66 | Wife | — | Mo. |
| 77 | Way Wilma Smith | 12 | Daughter | — | Iowa |
| 78 | Albert Greenleaf | 63 | Head | — | Ill. |
| 79 | James B Wirk | 43 | Head | Press Feeder | Iowa |
| 80 | Alberta Wirk | 40 | Wife | — | Iowa |
Pedigree Summary
Ralph
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 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)