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William Caldwell — 1940 US Census Record
Model Tree available1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this William Caldwell across the 1920, 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed), with identified parents Robert & Robert — first a son (b.~1920), then head of a 3-person household.
Age 20
b. ~1920
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Caldwell |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Occupation | Welder |
| Industry | NYA |
| Class of Worker | GW |
| Hours Worked | 9 |
| Income (1939) | 109 |
| Highest Grade | No 12 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Welder |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1920 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Robert Caldwell | Head | — | 66 | ~1874 |
| William Caldwell | Son | — | 20 | ~1920 |
| Ada Caldwell | Spouse | — | 52 | ~1888 |
Census Appearances
1920
Polk, Iowa
Son, age
Polk, Iowa · implied b. ~1920 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Caldwell |
| Given Name | William W |
| Relationship to Head | son |
| Sex | M |
| Color / Race | Black |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Missouri |
| Occupation | none |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Polk, Iowa
Son, age 10
Polk, Iowa · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Caldwell |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Missouri |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Son, age 20
Polk-County, Iowa · implied b. ~1920 — 3 household members
| Surname | Caldwell |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Occupation | Welder |
| Industry | NYA |
| Class of Worker | GW |
| Hours Worked | 9 |
| Income (1939) | 109 |
| Highest Grade | No 12 |
| 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 William Caldwell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Robert Caldwell (~0.92 confidence) and father Robert Caldwell (~0.92 confidence) and father Robert Caldwell (~0.92 confidence) and mother Ada Caldwell (~0.92 confidence) and mother Ada Caldwell (~0.92 confidence) and mother Eva Caldwell (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Robert Caldwell
b. ~1874
Source father
● Household
· direct · ~0.92
Father
Robert Caldwell
b. ~1875
Source father
● Household
· direct · ~0.92
Father
Robert Caldwell
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Ada Caldwell
b. ~1888
Source mother
● Household
· direct · ~0.92
Mother
Ada Caldwell
b. ~1894
Source mother
● Household
· direct · ~0.92
Mother
Eva Caldwell
b. ~1896
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Caldwell
Son · 1940 · age 20 · b. ~1920 · 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-t0627-01195-00675)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Oscar Maupins | 40 | Lodger | — | Iowa |
| 2 | Albert Wells | 22 | Head | Laborer | So. Dakota |
| 3 | Ruby Wells | 25 | Wife | — | Iowa |
| 4 | Raymond Robertson | 27 | Head | Laborer | Iowa |
| 5 | Georgia Robertson | 26 | Wife | — | Iowa |
| 6 | Donald Robertson | 6 | Son | — | Iowa |
| 7 | Beverly Robertson | 4 | Daughter | — | Iowa |
| 8 | Henry Simmerman | 18 | Head | Truck Driver | Iowa |
| 9 | Loraine Simmerman | 18 | Wife | — | Oklahoma |
| 10 | Earl Smith | 20 | Head | Laborer | Iowa |
| 11 | Norma Smith | 19 | Wife | — | Iowa |
| 12 | Judith Smith | 0 | Daughter | — | Iowa |
| 13 | William Saunders | 48 | Head | Laborer | Oklahoma |
| 14 | Rosetta Saunders | 70 | Wife | — | Missouri |
| 15 | Barbara Saunders | 9 | Daughter | — | Iowa |
| 16 | Maxine Saunders | 8 | Daughter | — | Iowa |
| 17 | Pearline Saunders | 6 | Daughter | — | Iowa |
| 18 | Anna L. Snyder | 63 | Head | — | Iowa |
| 19 | Otto L. Snyder | 38 | Son | — | Iowa |
| 20 | Arthur Snyder | 65 | Husband | Fireman | Iowa |
| 21 | Silas Bell | 50 | Head | Laborer | Kentucky |
| 22 | Ethel Bell | 45 | Wife | — | Kentucky |
| 23 | Wade Vera Bell | 25 | Neice | Maid | Illinois |
| 24 | Elizabeth Bell | 19 | Neice | Maid | Iowa |
| 25 | Joe Rubin | 55 | Head | Grocer | Russia |
| 26 | Bessie Rubin | 48 | Wife | — | Russia |
| 27 | Morris Aliber | 55 | Roomer | — | Russia |
| 28 | Anna Jackson | 35 | Head | — | Missouri |
| 29 | Ella Jackson | 8 | Daughter | — | Iowa |
| 30 | Frederick Jackson | 2 | Son | — | Iowa |
| 31 | Clarence Baxter | 38 | Head | Laborer | Tennessee |
| 32 | Ethel Baxter | 36 | Wife | — | Alabama |
| 33 | Alma Baxter | 21 | Daughter | Adult Education | Iowa |
| 34 | Gladys Baxter | 9 | Daughter | — | Iowa |
| 35 | Ethelbert Hick | 34 | Head | Laborer | Illinois |
| 36 | Daley Hick | 34 | Wife | — | Iowa |
| 37 | Robert Caldwell | 66 | Head | — | Kansas |
| 38 | Ada Caldwell | 52 | Wife | — | Missouri |
| 39 | William Caldwell THIS PERSON | 20 | Son | Welder | Iowa |
| 40 | John Hightower | 59 | Head | Packer | Texas |
Pedigree Summary
William
Gen 1 · 6 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)