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William Bird — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this William Bird across the 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 9-person household.
Age 11
b. ~1929
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Bird |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Des Moines City |
| 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Bird | Head | — | 52 | ~1888 |
| Donald Bird | Son | — | 9 | ~1931 |
| Virgil Bird | Son | — | 25 | ~1915 |
| Dora Bird | Spouse | — | 55 | ~1885 |
| Jack Bird | Son | — | 19 | ~1921 |
| William Bird | Son | — | 11 | ~1929 |
| Patricia Bird | Daughter | — | 12 | ~1928 |
| Florence Bird | Daughter | — | 15 | ~1925 |
| Merle Bird | Son | — | 21 | ~1919 |
Census Appearances
1930
Polk, Iowa
Son, age 1
Polk, Iowa · implied b. ~1929 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Bird |
| Given Name | William R |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Louisiana |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Son, age 11
Polk-County, Iowa · implied b. ~1929 — 9 household members
| Surname | Bird |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| 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 William Bird across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Bird
Son · 1940 · age 11 · b. ~1929 · Iowa
★ You are viewing this record
Sibling
Virgil Bird
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Bird
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Bird
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Merle Bird
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Bird
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jack Bird
Sibling · 1940 · age 19
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
40 people indexed on this census page (nara:1940:m-t0627-01196-00751)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ernest Hackney | 44 | Head | Laborer | Iowa |
| 42 | Alice Hackney | 44 | Wife | — | Iowa |
| 43 | Thomas Hackney | 17 | Son | — | Iowa |
| 44 | Robert May | 22 | Head | Butcher | Iowa |
| 45 | Marjorie May | 21 | Wife | — | Iowa |
| 46 | Robert May | 1 | Son | — | Iowa |
| 47 | Stanford May | 0 | Son | — | Iowa |
| 48 | Marjorie May | 1 | Daughter | — | Iowa |
| 49 | Rose O. May | 1 | Daughter | — | Iowa |
| 50 | Orville Bargett | 40 | Head | Mechanic | Iowa |
| 51 | Loral Bargett | 38 | Wife | — | Iowa |
| 52 | Orville Bargett | 18 | Son | — | Iowa |
| 53 | Herbert Bargett | 15 | Son | — | Iowa |
| 54 | Robert Bargett | 14 | Son | — | Iowa |
| 55 | David Bargett | 10 | Son | — | Iowa |
| 56 | Nancy Bargett | 5 | Daughter | — | Iowa |
| 57 | William Bird | 52 | Head | Laborer | Texas |
| 58 | Dora D. Bird | 55 | Wife | — | Missouri |
| 59 | Virgil Bird | 25 | Son | Laborer | Iowa |
| 60 | Merle Bird | 21 | Son | Carpenter | Iowa |
| 61 | Jack Bird | 19 | Son | — | Iowa |
| 62 | Florence Bird | 15 | Daughter | — | Iowa |
| 63 | Patricia Bird | 12 | Daughter | — | Iowa |
| 64 | William Bird THIS PERSON | 11 | Son | — | Iowa |
| 65 | Donald Bird | 9 | Son | — | Iowa |
| 66 | Jerry Holland | 49 | Head | Janitor | Mississippi |
| 67 | Corrie Holland | 42 | Wife | — | Kentucky |
| 68 | Will Robinson | 55 | Roomer | — | Florida |
| 69 | William Clarke | 62 | Head | — | Alabama |
| 70 | Sarah Clarke | 65 | Wife | — | Tennessee |
| 71 | Beulah Clarke | 32 | Daughter | Seamstress | Arkansas |
| 72 | Rowland Clarke | 12 | Son | — | Iowa |
| 73 | Randolph Clarke | 5 | Son | — | Iowa |
| 74 | Andrew Claybrooks | 60 | Head | Janitor | Illinois |
| 75 | Anna Claybrooks | 57 | Wife | — | Virginia |
| 76 | Louis Delt | 52 | Head | Janitor | Missouri |
| 77 | Cornelia Delt | 22 | Wife | — | Missouri |
| 78 | Edward Fields | 38 | Head | Teamster | Illinois |
| 79 | Mildred Fields | 36 | Wife | — | Missouri |
| 80 | Delores Fields | 15 | Daughter | — | 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)