OS
Opal Smith — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Decatur-County, Iowa
Our Model Tree links this Opal Smith across the 1930 and 1940 US Censuses in Decatur-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1924), then head of a 7-person household.
Age 16
b. ~1924
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Decatur-County, Iowa |
| Surname | Smith |
| Given Name | Opal |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Bloomington Township |
| 1935 Residence (County) | Decatur |
| Additional Details | |
| Highest Grade | H-3 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Bloomington Township |
| Est. Birth Year | ~1924 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Opal | Age | Birth yr |
|---|---|---|---|---|
| Lloyd Smith | Son | — | 20 | ~1920 |
| Alice Smith | Daughter | — | 13 | ~1927 |
| Nelson Smith | Head | — | 54 | ~1886 |
| Hazel Smith | Daughter | — | 10 | ~1930 |
| Harold Smith | Son | — | 18 | ~1922 |
| Maggie Smith | Spouse | — | 49 | ~1891 |
| Opal Smith | Daughter | — | 16 | ~1924 |
Census Appearances
1930
Decatur, Iowa
Daughter, age 6
Decatur, Iowa · implied b. ~1924 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Opal I. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Missouri |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Decatur-County, Iowa
Daughter, age 16
Decatur-County, Iowa · implied b. ~1924 — 7 household members
| Surname | Smith |
| Given Name | Opal |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Bloomington Township |
| 1935 Residence (County) | Decatur |
| Highest Grade | H-3 |
| 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 Opal Smith across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Opal Smith
Daughter · 1940 · age 16 · b. ~1924 · Iowa
★ You are viewing this record
Sibling
Alice Smith
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hazel Smith
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Smith
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lloyd Smith
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 — Decatur-County, Iowa
Open full size
1940 US Federal Census — Decatur-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01154-00352)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Charles E Rhodes | 72 | Head | Farm | Iowa |
| 42 | Lee Parati | 49 | Head | Farm | Nebraska |
| 43 | Hazel Parati | 46 | Wife | — | Iowa |
| 44 | Howard Parati | 21 | Son | — | Iowa |
| 45 | Roberta Parati | 14 | Daughter | — | Iowa |
| 46 | Francis Parati | 11 | Daughter | — | Iowa |
| 47 | Max Silvey | 14 | Nephew | — | Iowa |
| 48 | Lyle Silvey | 9 | Nephew | — | Iowa |
| 49 | Lloyd F Smith | 27 | Head | Farm | Iowa |
| 50 | Julia Smith | 24 | Wife | — | Iowa |
| 51 | Carolyn Smith | 1 | Daughter | — | Iowa |
| 52 | Nelson Smith | 54 | Head | Farming | Wisconsin |
| 53 | Maggie Smith | 49 | Wife | — | Missouri |
| 54 | Lloyd Smith | 20 | Son | — | Iowa |
| 55 | Harold Smith | 18 | Son | — | Iowa |
| 56 | Opal Smith THIS PERSON | 16 | Daughter | — | Iowa |
| 57 | Alice D Smith | 13 | Daughter | — | Iowa |
| 58 | Hazel Smith | 10 | Daughter | — | Iowa |
| 59 | Francis O Kelly | 26 | Head | Farming | Iowa |
| 60 | Ardis Kelly | 19 | Wife | — | Iowa |
| 61 | Francis L Kelly | 2 | Son | — | Iowa |
| 62 | Wayne Eugene Kelly | None | Son | — | Iowa |
| 63 | Carl C Dettmer | 26 | Head | Farm | Iowa |
| 64 | Josephine Dettmer | 23 | Wife | — | Missouri |
| 65 | Patsy Dettmer | 3 | Daughter | — | Missouri |
| 66 | E. M. Dettmer | 70 | Father | Assessor | Iowa |
| 67 | John L Fletcher | 49 | Head | Farm | Iowa |
| 68 | Veda Fletcher | 48 | Wife | — | Iowa |
| 69 | Verden Foreman | 50 | Head | Farm | Iowa |
| 70 | Lydia Foreman | 45 | Wife | — | Missouri |
| 71 | Edward Foreman | 22 | Son | Mail Carrier | Iowa |
| 72 | Raymond W Bohall | 38 | Head | Farming | Iowa |
| 73 | Dorothy Bohall | 28 | Wife | — | Iowa |
| 74 | Donnie Bohall | 7 | Son | — | Iowa |
| 75 | Ollie H Thack | 29 | Head | Farm | South Dakota |
| 76 | Priscilla Thack | 27 | Wife | — | Iowa |
| 77 | Arthur Boswell | 52 | Head | Farm | Iowa |
| 78 | Ethel Boswell | 48 | Wife | — | Iowa |
| 79 | Thomas Boswell | 19 | Son | — | Wisconsin |
| 80 | Nina Boswell | 15 | Daughter | — | Wisconsin |
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)