MS
Mary Sparks — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Linn-County, Iowa
Our Model Tree links this Mary Sparks across the 1930 and 1940 US Censuses in Linn-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1927), then head of a 7-person household.
Age 13
b. ~1927
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Linn-County, Iowa |
| Surname | Sparks |
| Given Name | Mary Jean |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Bertram Township |
| 1935 Residence (County) | Linn |
| Additional Details | |
| Industry | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Bertram Township |
| Est. Birth Year | ~1927 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Fay Sparks | Daughter | — | 3 | ~1937 |
| David Sparks | Head | — | 50 | ~1890 |
| Lavonne Sparks | Daughter | — | 8 | ~1932 |
| Dorothy Sparks | Daughter | — | 15 | ~1925 |
| Ora Sparks | Daughter | — | 17 | ~1923 |
| Mary Sparks | Daughter | — | 13 | ~1927 |
| Bessie Sparks | Spouse | — | 39 | ~1901 |
Census Appearances
1930
Linn, Iowa
Daughter, age 3
Linn, Iowa · implied b. ~1927 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sparks |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Linn-County, Iowa
Daughter, age 13
Linn-County, Iowa · implied b. ~1927 — 7 household members
| Surname | Sparks |
| Given Name | Mary Jean |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Bertram Township |
| 1935 Residence (County) | Linn |
| Industry | 0 |
| Highest Grade | No 7 |
| 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 Mary Sparks across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Sparks
Daughter · 1940 · age 13 · b. ~1927 · Iowa
★ You are viewing this record
Sibling
Lavonne Sparks
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Sparks
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ora Sparks
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Fay Sparks
Sibling · 1940 · age 3
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 — Linn-County, Iowa
Open full size
1940 US Federal Census — Linn-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01175-00029)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Elaine Washburn | 6 | Daughter | — | Iowa |
| 2 | David Sparks | 50 | Head | Machinist | Kentucky |
| 3 | Bessie Sparks | 39 | Wife | — | Iowa |
| 4 | Ora Marie Sparks | 17 | Daughter | — | Iowa |
| 5 | Dorothy Sparks | 15 | Daughter | — | Iowa |
| 6 | Mary Jean Sparks THIS PERSON | 13 | Daughter | — | Iowa |
| 7 | Lavonne R. Sparks | 8 | Daughter | — | Iowa |
| 8 | Fay Louise Sparks | 3 | Daughter | — | Iowa |
| 9 | F. L. Biderman | 36 | Head | Farmer | Iowa |
| 10 | Agnes C. Biderman | 29 | Wife | — | Iowa |
| 11 | Dorothy L. Biderman | 7 | Daughter | — | Iowa |
| 12 | Adeline M. Biderman | 4 | Daughter | — | Iowa |
| 13 | Larry J. Biderman | 2 | Son | — | Iowa |
| 14 | Estella Wheeler | 78 | Head | — | Iowa |
| 15 | Minnie Langguth | 61 | Servant | Housekeeper | Wisconsin |
| 16 | John Stolba | 79 | Head | Farmer | Czechoslovakia |
| 17 | Eva Konicek | 64 | Servant | Housekeeper | Iowa |
| 18 | Vernon Nemecek | 37 | Head | Gardener | Iowa |
| 19 | Albin F. Drabek | 32 | Head | Section Foreman | Iowa |
| 20 | Ann Drabek | 31 | Wife | — | Iowa |
| 21 | Paul J. Drabek | 5 | Son | — | Iowa |
| 22 | Sylvester Drabek | 4 | Son | — | Iowa |
| 23 | Kathryn Drabek | 1 | Daughter | — | Iowa |
| 24 | Frank W. Anderson | 28 | Head | Laborer | Iowa |
| 25 | Hollis Anderson | 27 | Wife | — | Kansas |
| 26 | Geneva Joyce Anderson | 2 | Daughter | — | Iowa |
| 27 | Nancy Ellen Anderson | 1 | Daughter | — | Iowa |
| 28 | Joseph Mikulicky | 57 | Head | Farmer | Czechoslovakia |
| 29 | Anna Mikulicky | 50 | Wife | — | Iowa |
| 30 | William Mikulicky | 25 | Son | Laborer | Iowa |
| 31 | Ruth Mikulicky | 25 | Daughter | Teacher | Iowa |
| 32 | Lester Mikulicky | 24 | Son | Farmer | Iowa |
| 33 | Frank S. Anderson | 65 | Head | Farmer | Illinois |
| 34 | Alva Ethel Anderson | 60 | Wife | — | Iowa |
| 35 | Paul Anderson | 23 | Son | Farmer | Iowa |
| 36 | Edward Marsh | 43 | Head | Farmer | New York |
| 37 | Cora Marsh | 38 | Wife | — | Iowa |
| 38 | Edwin Marsh | 19 | Son | Mill-Worker | New York |
| 39 | Donald Marsh | 18 | Son | New Worker | New York |
| 40 | Robert Marsh | 15 | Son | — | 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)