MF
Mary Frey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Union-County, Iowa
Our Model Tree links this Mary Frey across the 1930 and 1940 US Censuses in Union-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1924), then head of a 6-person household.
Age 16
b. ~1924
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Union-County, Iowa |
| Surname | Frey |
| Given Name | Mary G. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Creston City |
| 1935 Residence (County) | Union |
| Additional Details | |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Creston City |
| Est. Birth Year | ~1924 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Pauline Frey | Daughter | — | 10 | ~1930 |
| Mary Frey | Daughter | — | 16 | ~1924 |
| Challenge Frey | Head | — | 42 | ~1898 |
| Ardella Frey | Daughter | — | 15 | ~1925 |
| Thelma Frey | Daughter | — | 14 | ~1926 |
| Mary Frey | Spouse | — | 36 | ~1904 |
Census Appearances
1930
Union, Iowa
Daughter, age 6
Union, Iowa · implied b. ~1924 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Fray |
| Given Name | Mary J |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Union-County, Iowa
Daughter, age 16
Union-County, Iowa · implied b. ~1924 — 6 household members
| Surname | Frey |
| Given Name | Mary G. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Creston City |
| 1935 Residence (County) | Union |
| Highest Grade | H 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 Mary Frey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Frey
Daughter · 1940 · age 16 · b. ~1924 · Iowa
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Sibling
Pauline Frey
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ardella Frey
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thelma Frey
Sibling · 1940 · age 14
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 — Union-County, Iowa
Open full size
1940 US Federal Census — Union-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01208-00188)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Rachel Hokinson | 31 | Head | Book Keeper | Iowa |
| 2 | Clyde Ingraham | 51 | Head | Laborer | Iowa |
| 3 | May Ingraham | 52 | Wife | — | Iowa |
| 4 | Dorothy Ingraham | 21 | Daughter | N.Y.A. | Iowa |
| 5 | Grant Ingraham | 25 | Son | Mechanic | Iowa |
| 6 | Frank Merrill | 75 | Head | — | Iowa |
| 7 | Maggie M. Merrill | 65 | Wife | — | Iowa |
| 8 | Otha Means | 48 | Head | Laborer | Iowa |
| 9 | Alphia Means | 42 | Wife | — | Iowa |
| 10 | Robert Means | 21 | Son | Salesman | Iowa |
| 11 | Alva A. Richman | 36 | Head | — | Iowa |
| 12 | Lettie Richman | 35 | Wife | — | Iowa |
| 13 | Betty J. Richman | 12 | Daughter | — | Iowa |
| 14 | H. Helen Richman | 10 | Daughter | — | Iowa |
| 15 | Challenge Frey | 42 | Head | Carpenter | Iowa |
| 16 | Mary E. Frey | 36 | Wife | — | Iowa |
| 17 | Mary G. Frey THIS PERSON | 16 | Daughter | — | Iowa |
| 18 | Ardella Frey | 15 | Daughter | — | Iowa |
| 19 | Thelma M. Frey | 14 | Daughter | — | Iowa |
| 20 | Pauline Frey | 10 | Daughter | — | Iowa |
| 21 | Kenneth Lyon | 28 | Head | Driver | Iowa |
| 22 | Gertrude Lyon | 25 | Wife | — | Iowa |
| 23 | Larry Lyon | 3 | Son | — | Iowa |
| 24 | William G. Risley | 54 | Head | Proprietor | Illinois |
| 25 | Hannie L. Risley | 54 | Wife | — | Illinois |
| 26 | George A. Risley | 20 | Son | — | Iowa |
| 27 | Willis G. Koger | 48 | Head | Manager | Iowa |
| 28 | Mary Koger | 53 | Wife | — | Illinois |
| 29 | Marion Shields | 42 | Head | Proprietor | Iowa |
| 30 | Frances Shields | 40 | Wife | — | Iowa |
| 31 | James Shields | 20 | Son | — | Iowa |
| 32 | Robert Shields | 11 | Son | — | Iowa |
| 33 | Richard Shields | 7 | Son | — | Iowa |
| 34 | Leo Kelly | 42 | Head | Proprietor | Iowa |
| 35 | Ethel Kelly | 42 | Wife | — | Iowa |
| 36 | Kathleen Kelly | 12 | Daughter | — | Iowa |
| 37 | John Kelly | 10 | Son | — | Iowa |
| 38 | James Blazek | 80 | Head | — | Bohemia |
| 39 | Nettie Blazek | 69 | Wife | — | New York |
| 40 | Leo L. Dickson | 26 | Head | Trucker | Kansas |
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)