JS
Joan Smith — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Webster-County, Iowa
Our Model Tree links this Joan Smith across the 1930 and 1940 US Censuses in Webster-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 6-person household.
Age 11
b. ~1929
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Webster-County, Iowa |
| Surname | Smith |
| Given Name | Joan |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Ft Dodge |
| 1935 Residence (County) | Webster |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Ft Dodge |
| Est. Birth Year | ~1929 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Joan | Age | Birth yr |
|---|---|---|---|---|
| Esther Smith | Spouse | — | 36 | ~1904 |
| Joan Smith | Daughter | — | 11 | ~1929 |
| Jean Smith | Daughter | — | 4 | ~1936 |
| Leon Smith | Head | — | 37 | ~1903 |
| Leon Smith | Son | — | 12 | ~1928 |
| Paul Smith | Son | — | 8 | ~1932 |
Census Appearances
1930
Webster, Iowa
Daughter, age 1
Webster, Iowa · implied b. ~1929 — 49 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Joan |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Webster-County, Iowa
Daughter, age 11
Webster-County, Iowa · implied b. ~1929 — 6 household members
| Surname | Smith |
| Given Name | Joan |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Ft Dodge |
| 1935 Residence (County) | Webster |
| Highest Grade | No 5 |
| 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 Joan Smith across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Joan Smith
Daughter · 1940 · age 11 · b. ~1929 · Iowa
★ You are viewing this record
Sibling
Jean Smith
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leon Smith
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Smith
Sibling · 1940 · age 8
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 — Webster-County, Iowa
Open full size
1940 US Federal Census — Webster-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01212-00571)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Larry L. Baldwin | 4 | Son | — | Iowa |
| 42 | Edith Le Master | 17 | Maid | Housekeeper | Iowa |
| 43 | Claude E. Friedrich | 54 | Head | Optometrist | Illinois |
| 44 | Nell M. Friedrich | 45 | Wife | — | Iowa |
| 45 | Thomas M. Dawson | 50 | Head | Captain | Ireland |
| 46 | Mary C. Dawson | 52 | Wife | — | Iowa |
| 47 | George C. Somers | 53 | Head | Chief Yard Clerk | Indiana |
| 48 | Minnie Farrell | 71 | Aunt | — | Iowa |
| 49 | Arthur Z. Lloyd | 43 | Head | District Manager | Missouri |
| 50 | Helen B. Lloyd | 38 | Wife | — | Illinois |
| 51 | Robert Z. Lloyd | 19 | Son | — | Illinois |
| 52 | Donald G. Lloyd | 12 | Son | — | Illinois |
| 53 | Marion R. Swanney | 35 | Head | Manager | Iowa |
| 54 | Dorothy M. Swanney | 33 | Wife | — | Iowa |
| 55 | Barbara Swanney | 9 | Daughter | — | Iowa |
| 56 | Dixie Swanney | 4 | Daughter | — | Iowa |
| 57 | Marcus J. Cavanaugh | 41 | Head | Surplus Commodity Clerk | Iowa |
| 58 | Ruth Cavanaugh | 37 | Wife | — | Iowa |
| 59 | Marcus Jr. Cavanaugh | 15 | Son | — | Iowa |
| 60 | Diana Cavanaugh | 13 | Daughter | — | Minnesota |
| 61 | John Cavanaugh | 12 | Son | — | Minnesota |
| 62 | Lenore Cavanaugh | 7 | Daughter | — | Iowa |
| 63 | Leon F. Smith | 37 | Head | Dentist | Iowa |
| 64 | Esther Smith | 36 | Wife | — | Iowa |
| 65 | Leon W. Smith | 12 | Son | — | Iowa |
| 66 | Joan Smith THIS PERSON | 11 | Daughter | — | Iowa |
| 67 | Paul Smith | 8 | Son | — | Iowa |
| 68 | Jean Ann Smith | 4 | Daughter | — | Iowa |
| 69 | Roger E. Fox | 43 | Head | Manager | Iowa |
| 70 | Edna P. Fox | 42 | Wife | — | Iowa |
| 71 | William R. Fox | 11 | Son | — | Iowa |
| 72 | Wilbur J. Strait | 45 | Head | Clerk | Iowa |
| 73 | Ann C. Strait | 45 | Wife | — | Iowa |
| 74 | Billy R. Strait | 7 | Son | — | Iowa |
| 75 | Helmuth Rumme | 43 | Head | Rural Mail Carrier | Iowa |
| 76 | Ethel B. Rumme | 37 | Wife | — | Iowa |
| 77 | Gilbert C. Rumme | 12 | Son | — | Iowa |
| 78 | Erla M. Rumme | 9 | Daughter | — | Iowa |
| 79 | Donald W. Rumme | 4 | Son | — | Iowa |
| 80 | Grant E. Core | 33 | Head | Salesman | 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)