SD
Shirley Davis — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Sac-County, Iowa
Our Model Tree links this Shirley Davis across the 1930 and 1940 US Censuses in Sac-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 11-person household.
Age 17
b. ~1923
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Sac-County, Iowa |
| Surname | Davis |
| Given Name | Shirley |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Sac City |
| 1935 Residence (County) | Sac |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Sac City |
| Est. Birth Year | ~1923 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Shirley | Age | Birth yr |
|---|---|---|---|---|
| Esther Davis | Daughter | — | 15 | ~1925 |
| Verla Davis | Daughter | — | 9 | ~1931 |
| Janice Davis | Daughter | — | 1 | ~1939 |
| Albert Davis | Son | — | 12 | ~1928 |
| Ralph Davis | Son | — | 4 | ~1936 |
| Shirley Davis | Daughter | — | 17 | ~1923 |
| Ardyce Davis | Daughter | — | 7 | ~1933 |
| Harold Davis | Head | — | 42 | ~1898 |
| Gladys Davis | Spouse | — | 38 | ~1902 |
| Norma Davis | Daughter | — | 14 | ~1926 |
| Myrle Davis | Son | — | 19 | ~1921 |
Census Appearances
1930
Sac, Iowa
Daughter, age 7
Sac, Iowa · implied b. ~1923 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davis |
| Given Name | Shirley V |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Sac-County, Iowa
Daughter, age 17
Sac-County, Iowa · implied b. ~1923 — 11 household members
| Surname | Davis |
| Given Name | Shirley |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Sac City |
| 1935 Residence (County) | Sac |
| Income (1939) | 0 |
| Highest Grade | H-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 Shirley Davis across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Shirley Davis
Daughter · 1940 · age 17 · b. ~1923 · Iowa
★ You are viewing this record
Sibling
Norma Davis
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Albert Davis
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ralph Davis
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ardyce Davis
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Janice Davis
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Esther Davis
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Verla Davis
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Myrle Davis
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 — Sac-County, Iowa
Open full size
1940 US Federal Census — Sac-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01201-00631)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Henry Polzjien | 35 | Head | Laborer | Iowa |
| 42 | Leona Polzjien | 29 | Wife | — | Iowa |
| 43 | La Vonne Polzjien | 7 | Daughter | — | Iowa |
| 44 | Henry Jr. Polzjien | 4 | Son | — | Iowa |
| 45 | William Polzjien | 2 | Son | — | Iowa |
| 46 | Mary Anne Reis | 18 | Lodger | Waitress | Iowa |
| 47 | Huntley Bolt | 45 | Head | Farm Laborer | Illinois |
| 48 | Gerald Bolt | 23 | Son | Farm Laborer | Iowa |
| 49 | Donald Bolt | 18 | Son | — | Iowa |
| 50 | Asahel E. Sawyer | 63 | Head | Plasterer | Iowa |
| 51 | Elizabeth A. Sawyer | 54 | Wife | — | S. Dakota |
| 52 | Mary Sawyer | 34 | Daughter | — | S. Dakota |
| 53 | Mary Myrick | 70 | Head | — | Illinois |
| 54 | C. Edward Eggleston | 54 | Head | — | Iowa |
| 55 | Nona Eggleston | 52 | Wife | — | Iowa |
| 56 | Alice Eggleston | 27 | Daughter | Waitress | Iowa |
| 57 | Leonard Eggleston | 21 | Son | Mechanic | Iowa |
| 58 | Ella Eggleston | 18 | Daughter | — | Iowa |
| 59 | Extra Line Eggleston | None | — | — | — |
| 60 | G. Merle Zepp | 32 | Head | Construction Foreman | Iowa |
| 61 | Frances Zepp | 30 | Wife | — | Iowa |
| 62 | Phyllis Zepp | 4 | Daughter | — | Iowa |
| 63 | Mark Van Horn | 52 | Head | Barber | Iowa |
| 64 | Nellie Van Horn | 50 | Wife | Nurse | Iowa |
| 65 | James Van Horn | 25 | Son | Bookkeeping | Iowa |
| 66 | Harriett Van Horn | 18 | Daughter | Bookkeeper | Iowa |
| 67 | Mildred Van Horn | 16 | Daughter | — | Iowa |
| 68 | Marion Van Horn | 15 | Daughter | — | Iowa |
| 69 | Harold Davis | 42 | Head | Repair Engineer | Iowa |
| 70 | Gladys Davis | 38 | Wife | — | Iowa |
| 71 | Myrle Davis | 19 | Son | Cleaning Crew | Iowa |
| 72 | Shirley Davis THIS PERSON | 17 | Daughter | — | Iowa |
| 73 | Esther Davis | 15 | Daughter | — | Iowa |
| 74 | Norma Davis | 14 | Daughter | — | Iowa |
| 75 | Albert Davis | 12 | Son | — | Iowa |
| 76 | Verla Davis | 9 | Daughter | — | Iowa |
| 77 | Ardyce Davis | 7 | Daughter | — | Iowa |
| 78 | Ralph Davis | 4 | Son | — | Iowa |
| 79 | Janice Davis | 1 | Daughter | — | Iowa |
| 80 | Tilford H. Carlson | 27 | Head | Truck 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)