MG
Mary Griffin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Linn-County, Iowa
Our Model Tree links this Mary Griffin across the 1920, 1930 and 1940 US Censuses in Linn-County, Iowa (XGBoost, ~Confirmed), with identified parents John & Anna — first a daughter (b.~1919), then head of a 6-person household.
Age 21
b. ~1919
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Linn-County, Iowa |
| Surname | Griffin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Cedar Rapids |
| 1935 Residence (County) | Linn |
| Additional Details | |
| Occupation | Comptometer Operator |
| Industry | Wholesale Grocery |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 554 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Comptometer Operator |
| Township / Ward | Cedar Rapids |
| Est. Birth Year | ~1919 |
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 |
|---|---|---|---|---|
| Mary Griffin | Daughter | — | 21 | ~1919 |
| John Griffin | Head | — | 56 | ~1884 |
| John Griffin | Son | — | 17 | ~1923 |
| Francis Griffin | Son | — | 24 | ~1916 |
| James Griffin | Son | — | 19 | ~1921 |
| Anna Griffin | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Linn, Iowa
Daughter, age 1
Linn, Iowa · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffen |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Linn, Iowa
Daughter, age 11
Linn, Iowa · implied b. ~1919 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Linn-County, Iowa
Daughter, age 21
Linn-County, Iowa · implied b. ~1919 — 6 household members
| Surname | Griffin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Cedar Rapids |
| 1935 Residence (County) | Linn |
| Occupation | Comptometer Operator |
| Industry | Wholesale Grocery |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 554 |
| 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 Mary Griffin across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Griffin (~0.92 confidence) and mother Anna Griffen (~0.92 confidence) and mother Anna Griffin (~0.92 confidence) and father John Griffin (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Griffin
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Anna Griffen
b. ~1883
Source mother
● Household
· direct · ~0.92
Mother
Anna Griffin
b. ~1883
Source mother
● Household
· direct · ~0.92
Father
John Griffin
b. ~1884
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Griffin
Daughter · 1940 · age 21 · b. ~1919 · Iowa
★ You are viewing this record
Sibling
Francis Griffin
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Griffin
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Griffin
Sibling · 1940 · age 17
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-t0627-01176-00436)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Thelma R Van Dyke | 32 | Wife | — | Iowa |
| 42 | Robert B Van Dyke | 10 | Son | — | Iowa |
| 43 | Jean E Van Dyke | 2 | Daughter | — | Iowa |
| 44 | James M Williams | 25 | Son-in-law | Salesman | Iowa |
| 45 | Lois J Williams | 24 | Daughter | Laborer | Iowa |
| 46 | Melva R Williams | 1 | Granddaughter | — | Belle Plaine |
| 47 | John T Griffin | 56 | Head | Electrician | Pennsylvania |
| 48 | Anna C Griffin | 57 | Wife | — | Iowa |
| 49 | Francis Griffin | 24 | Son | Electrician | Iowa |
| 50 | James Griffin | 19 | Son | Salesman | Iowa |
| 51 | John Griffin | 17 | Son | — | Iowa |
| 52 | Mary Griffin THIS PERSON | 21 | Daughter | Comptometer Operator | Iowa |
| 53 | Eugenia Nafal | 43 | Head | — | Egypt |
| 54 | Alec Nafal | 25 | Son | Salesman | Iowa |
| 55 | George Nafal | 16 | Son | — | Iowa |
| 56 | Louise Nafal | 13 | Daughter | — | Iowa |
| 57 | Harry Nafal | 11 | Son | — | Iowa |
| 58 | Theodore Nafal | 9 | Son | — | Iowa |
| 59 | Martin L Mickey | 65 | Head | Cabinet Maker | Iowa |
| 60 | Bessie M Mickey | 57 | Wife | — | Iowa |
| 61 | Reserved But Not Used Extra Line | None | — | — | — |
| 62 | Reserved But Not Used Extra Line | None | — | — | — |
| 63 | Elizabeth S Bletsch | 65 | Head | Doctor Of Therapeutics | Indiana |
| 64 | Ernest O Baker | 37 | Son | Salesman | Iowa |
| 65 | Lawrence L Conner | 19 | Grandson | Truck Driver | Iowa |
| 66 | Katie Partington | 84 | Lodger | — | Iowa |
| 67 | Lawrence Ritchie | 22 | Lodger | Comptometer Operator | South Dakota |
| 68 | Amos L Whistler | 73 | Head | — | Iowa |
| 69 | Amanda Whistler | 72 | Wife | — | Iowa |
| 70 | Anna B Frommelt | 70 | Head | — | Iowa |
| 71 | Beryl Frommelt | 36 | Son | Salesman | Iowa |
| 72 | Edward A Swope | 46 | Head | Laborer | Iowa |
| 73 | Clay A Bishop | 79 | Partner | Laborer | Missouri |
| 74 | Esther Bishop | 37 | Housekeeper | Housekeeper | Missouri |
| 75 | May Van Ness | 58 | Head | — | Kansas |
| 76 | William C Steinbach | 43 | Son | Painter | Illinois |
| 77 | George F Steinbach | 40 | Son | Painter | Illinois |
| 78 | Molly K Svacha | 41 | Head | Butcher | Iowa |
| 79 | Mary C Svacha | 65 | Wife | — | Czechoslovakia |
| 80 | Lizzie Cejka | 62 | Head | — | Iowa |
Pedigree Summary
Mary + 3 siblings
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)