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Mary Ball — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Johnson-County, Iowa
Our Model Tree links this Mary Ball across the 1930 and 1940 US Censuses in Johnson-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1901), then head of a 10-person household.
Age 39
b. ~1901
Female
Spouse
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Johnson-County, Iowa |
| Surname | Ball |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Clear Creek Township |
| 1935 Residence (County) | Johnson |
| Additional Details | |
| Occupation | Housewife |
| Class of Worker | NP |
| Highest Grade | No 12 |
| 1935 Residence | Same House |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Housewife |
| Township / Ward | Clear Creek Township |
| Est. Birth Year | ~1901 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Virginia Ball | Daughter | — | 13 | ~1927 |
| Earl Ball | Head | — | 47 | ~1893 |
| Farrell Brown | Other | — | 22 | ~1918 |
| Carolyn Swenka | Other | — | 22 | ~1918 |
| Richard Ball | Son | — | 1 | ~1939 |
| Ivan Ball | Son | — | 9 | ~1931 |
| William Ball | Son | — | 7 | ~1933 |
| Eugene Ball | Son | — | 15 | ~1925 |
| James Ball | Son | — | 3 | ~1937 |
| Mary Ball | Spouse | — | 39 | ~1901 |
Census Appearances
1930
Johnson, Iowa
Other, age 29
Johnson, Iowa · implied b. ~1901 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Ball |
| Given Name | Mary H. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 24 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Johnson-County, Iowa
Spouse, age 39
Johnson-County, Iowa · implied b. ~1901 — 10 household members
| Surname | Ball |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Clear Creek Township |
| 1935 Residence (County) | Johnson |
| Occupation | Housewife |
| Class of Worker | NP |
| Highest Grade | No 12 |
| 1935 Residence | Same House |
| 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 Ball across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Ball
Spouse · 1940 · age 39 · b. ~1901 · Iowa
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Johnson-County, Iowa
Open full size
1940 US Federal Census — Johnson-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01171-00067)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | George Herman | 44 | Head | Farmer | Iowa |
| 42 | Iona Hardy | 21 | Housekeeper | Housekeeper | Iowa |
| 43 | Vincent Haman | 22 | Head | Farmer | Iowa |
| 44 | Reuben Curry | 59 | Head | Farmer | Iowa |
| 45 | Roy X Anthony | 47 | Head | Farmer | Iowa |
| 46 | Addie Anthony | 50 | Sister | — | Iowa |
| 47 | Earl Ball | 47 | Head | Farmer | Iowa |
| 48 | Mary Ball THIS PERSON | 39 | Wife | Housewife | Iowa |
| 49 | Eugene Ball | 15 | Son | In School | Iowa |
| 50 | Virginia Ball | 13 | Daughter | In School | Iowa |
| 51 | Ivan Ball | 9 | Son | — | Iowa |
| 52 | William Ball | 7 | Son | — | Iowa |
| 53 | James Ball | 3 | Son | — | Iowa |
| 54 | Richard Ball | 1 | Son | — | Iowa |
| 55 | Farrell Brown | 22 | Lodger | Farm Hand | Iowa |
| 56 | Carolyn Swenka | 22 | Lodger | Hired Girl | Iowa |
| 57 | Raymond Kasper | 41 | Head | Farmer | Iowa |
| 58 | Helen Kasper | 35 | Wife | Housewife | Iowa |
| 59 | Jesse Reeve | 63 | Head | Farmer | Iowa |
| 60 | Rose Reeve | 55 | Sister | Schoolteacher | Iowa |
| 61 | Claude Campbell | 29 | Head | In Quarry | Tenn |
| 62 | Dorothy Campbell | 26 | Wife | Housewife | Iowa |
| 63 | Doris Campbell | 6 | Daughter | — | Iowa |
| 64 | Leland Campbell | 4 | Son | — | Iowa |
| 65 | Claudette Campbell | 1 | Daughter | — | Iowa |
| 66 | Elizabeth Roger | 63 | Head | Farmer | Iowa |
| 67 | Ralph Roger | 38 | Son | Farm Hand | Iowa |
| 68 | Laverne Murray | 23 | Lodger | Farm Hand | Nebraska |
| 69 | Dwight Wood | 38 | Head | Farmer | Iowa |
| 70 | Maud Wood | 39 | Wife | Housewife | Iowa |
| 71 | Lorin Wood | 13 | Son | — | Iowa |
| 72 | Donald Wood | 9 | Son | — | Iowa |
| 73 | Norma Wood | 7 | Daughter | — | Iowa |
| 74 | Lee Moore | 56 | Head | Farmer | Tenn |
| 75 | Gertrude Moore | 54 | Wife | Housewife | Iowa |
| 76 | George Potter | 22 | Lodger | Farm Hand | Iowa |
| 77 | J. J. Shay | 49 | Head | Farmer | Iowa |
| 78 | Veda Shay | 47 | Wife | Housewife | Iowa |
| 79 | Marian Shay | 20 | Daughter | Secretary | Iowa |
| 80 | Phyllis Shay | 14 | Daughter | In School | 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)