JL
John Lewis — 1940 US Census Record
Model Tree available1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this John Lewis across the 1920, 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed), with identified parents John & Louise — first a son (b.~1917), then head of a 3-person household.
Age 23
b. ~1917
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Lewis |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Occupation | Draughtsman |
| Industry | County State Road WPA |
| Class of Worker | GW |
| Hours Worked | 24 |
| Income (1939) | 800 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Draughtsman |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1917 |
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 |
|---|---|---|---|---|
| Louise Lewis | Head | — | 62 | ~1878 |
| John Lewis | Son | — | 23 | ~1917 |
| Robert Lewis | Son | — | 20 | ~1920 |
Census Appearances
1920
Polk, Iowa
Son, age 2
Polk, Iowa · implied b. ~1918 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lewis |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Sweden |
| Mother Tongue | Swedish |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Polk, Iowa
Son, age 12
Polk, Iowa · implied b. ~1918 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lewis |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Sweden |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Son, age 23
Polk-County, Iowa · implied b. ~1917 — 3 household members
| Surname | Lewis |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Occupation | Draughtsman |
| Industry | County State Road WPA |
| Class of Worker | GW |
| Hours Worked | 24 |
| Income (1939) | 800 |
| Highest Grade | Hs 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 John Lewis across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Lewis (~0.92 confidence) and mother Louise Lewis (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Lewis
b. ~1874
Source father
● Household
· direct · ~0.92
Mother
Louise Lewis
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Lewis
Son · 1940 · age 23 · b. ~1917 · Iowa
★ You are viewing this record
Sibling
Robert Lewis
Sibling · 1940 · age 20
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
38 people indexed on this census page (nara:1940:m-t0627-01193-00871)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 42 | Harry H. Largent | 45 | Head | Laborer | Iowa |
| 43 | Bertha J. Largent | 48 | Wife | — | Illinois |
| 44 | S. N. Sutphin | 54 | Head | Laborer | Illinois |
| 45 | Dale Sutphin | 17 | Son | Laborer | Iowa |
| 46 | T. P. Watson | 35 | Head | Brakeman | Missouri |
| 47 | Tena N. Watson | 24 | Wife | — | Iowa |
| 48 | Robert T. Watson | 8 | Son | — | Iowa |
| 49 | Roberta Marie Watson | 1 | Daughter | — | Iowa |
| 50 | Louise O. Lewis | 62 | Head | — | Sweden |
| 51 | John H. Lewis THIS PERSON | 23 | Son | Draughtsman | Iowa |
| 52 | Robert M. Lewis | 20 | Son | Clerk | Iowa |
| 54 | Clarence E. Blake | 59 | Head | Laborer | Iowa |
| 55 | Nella Blake | 55 | Wife | — | Iowa |
| 56 | Raymond Rhoades | 44 | Brother in law | Laborer | Iowa |
| 57 | Joe Dongi | 74 | Head | — | Austria |
| 58 | Annie Dongi | 73 | Wife | — | Austria |
| 59 | Albert E. Sherwood | 53 | Head | Foreman | England |
| 60 | Mabel S. Sherwood | 37 | Wife | — | Iowa |
| 61 | Bernard C. Sherwood | 14 | Son | — | Iowa |
| 62 | Arlene E. Sherwood | 12 | Daughter | — | Iowa |
| 63 | Louis H. Sherwood | 9 | Son | — | Iowa |
| 64 | Annie Marie Sherwood | 9 | Daughter | — | Iowa |
| 65 | Alberta A. Sherwood | 6 | Daughter | — | Iowa |
| 66 | Rebecca S. Sherwood | 1 | Daughter | — | Iowa |
| 67 | C. T. Gangestad | 65 | Head | — | Norway |
| 68 | Howard A. Young | 39 | Head | Switchman | Arkansas |
| 69 | Pauline S. Young | 37 | Wife | — | Iowa |
| 70 | Jacqueline E. Young | 12 | Daughter | — | Iowa |
| 71 | Howard P. Young | 10 | Son | — | Iowa |
| 72 | Henry Smith | 45 | Head | Miner | Iowa |
| 73 | Helen Smith | 40 | Wife | — | Iowa |
| 74 | Joe Smith | 18 | Son | Laborer | Iowa |
| 75 | Gene Smith | 14 | Son | — | Iowa |
| 76 | Rachel Ann Smith | 12 | Daughter | — | Iowa |
| 77 | William R. Smith | 10 | Son | — | Iowa |
| 78 | Betty K. Smith | 1 | Daughter | — | Iowa |
| 79 | Ralph H. De Bolt | 39 | Head | Laborer | Iowa |
| 80 | Faye E. De Bolt | 40 | Wife | Teleph. Op. | Iowa |
Related Census Records
Pedigree Summary
John + 1 sibling
Gen 1 · 2 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)