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Betty Smith — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Betty Smith across the 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 12-person household.
Age 14
b. ~1926
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Smith |
| Given Name | Betty |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Additional Details | |
| Highest Grade | Hs 1 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Waterloo City |
| Est. Birth Year | ~1926 |
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.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Betty | Age | Birth yr |
|---|---|---|---|---|
| Constance Smith | Daughter | — | 13 | ~1927 |
| Betty Smith | Daughter | — | 14 | ~1926 |
| Maidi Smith | Daughter | — | 12 | ~1928 |
| Mary Smith | Daughter | — | 12 | ~1928 |
| William Smith | Head | — | 40 | ~1900 |
| Charles Smith | Son | — | 11 | ~1929 |
| Kenneth Smith | Son | — | 9 | ~1931 |
| Daniel Smith | Son | — | 17 | ~1923 |
| Richard Smith | Son | — | 7 | ~1933 |
| Victor Smith | Son | — | 4 | ~1936 |
| Hillian Smith | Son | — | 6 | ~1934 |
| Hazel Smith | Spouse | — | 36 | ~1904 |
Census Appearances
1930
Black Hawk, …
Daughter, age 4
Black Hawk, Iowa · implied b. ~1926 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Betty C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Home Owned/Rented | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Black-Hawk-County, Iowa
Daughter, age 14
Black-Hawk-County, Iowa · implied b. ~1926 — 12 household members
| Surname | Smith |
| Given Name | Betty |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Highest Grade | Hs 1 |
| 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 Betty Smith across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Betty Smith
Daughter · 1940 · age 14 · b. ~1926 · Iowa
★ You are viewing this record
Sibling
Constance Smith
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Smith
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Smith
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kenneth Smith
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Smith
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Daniel Smith
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Victor Smith
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hillian Smith
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Maidi Smith
Sibling · 1940 · age 12
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 — Black-Hawk-County, Iowa
Open full size
1940 US Federal Census — Black-Hawk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01140-01024)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William Smith | 40 | head | Salesman | Iowa |
| 42 | Hazel C. Smith | 36 | wife | Housewife | Iowa |
| 43 | Daniel Smith | 17 | son | — | Iowa |
| 44 | Constance L. Smith | 13 | daughter | — | Iowa |
| 45 | Betty Smith THIS PERSON | 14 | daughter | — | Iowa |
| 46 | Mary M. Smith | 12 | daughter | — | Iowa |
| 47 | Maidi M. Smith | 12 | daughter | — | Iowa |
| 48 | Charles Smith | 11 | son | — | Iowa |
| 49 | Kenneth Smith | 9 | son | — | Iowa |
| 50 | Richard G. Smith | 7 | son | — | Iowa |
| 51 | Hillian Smith | 6 | son | — | Iowa |
| 52 | Victor Smith | 4 | son | — | Iowa |
| 53 | Lloyd Bonser | 44 | head | Foreman | Iowa |
| 54 | Blanche Bonser | 43 | wife | Housewife | Iowa |
| 55 | Paul R. Bonser | 24 | head | Setup Man | Iowa |
| 56 | Mildred Bonser | 23 | wife | Housewife | Iowa |
| 57 | Lloyd C. Bonser | 4 | son | — | Iowa |
| 58 | Paul R. Bonser | 2 | son | — | Iowa |
| 59 | Elmer Kegler | 52 | head | Machinist | Iowa |
| 60 | Mary Kegler | 51 | wife | Housewife | Iowa |
| 61 | Alverta Kegler | 14 | daughter | — | South Dakota |
| 62 | Albert Mcmillen | 30 | head | Truck Driver | Iowa |
| 63 | Frances Mcmillen | 30 | wife | Housewife | Iowa |
| 64 | Shirley Ann Mcmillen | 12 | daughter | — | Iowa |
| 65 | Rhys H. Mcmillen | 3 | son | — | Iowa |
| 66 | Charles Harwell | 72 | head | Grocer | Nebraska |
| 67 | Vincent Bernard | 26 | head | Foreman | Iowa |
| 68 | Evelyn Bernard | 22 | wife | Housewife | Iowa |
| 69 | Madonna Bernard | 3 | daughter | — | Iowa |
| 70 | Geraldine Bernard | 1 | daughter | — | Iowa |
| 71 | Mark Bernard | 22 | brother | Lineman | Iowa |
| 72 | Leroy C. Nicos | 62 | head | — | Iowa |
| 73 | Lelia M. Nicos | 55 | wife | Housewife | Iowa |
| 74 | Donald H. Bolte | 26 | son-in-law | Machinist | Iowa |
| 75 | Thelma A. Bolte | 32 | daughter | Stuffer | Iowa |
| 76 | John H. Malone | 49 | head | Switchman | Illinois |
| 77 | Marie Malone | 44 | wife | House Wife | Iowa |
| 78 | Allen Anna L. Malone | 26 | daughter | Laboratory Girl | Iowa |
| 79 | John M. Malone | 16 | son | — | Iowa |
| 80 | Allen M. Bolte | 8 | grandson | — | 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)